ACETYLENE DERIVATIVES, PROCESS FOR PRODUCING THE SAME, LIQUID CRYSTAL COMPOSITION CONTAINING THE SAME AS ACTIVE INGREDIENT, AND LIQUID CRYSTAL ELEMENT MADE THEREFROM

Abstract: An acetylene derivative represented by general formula (I), wherein R¹ represents C₃-C₂₀ saturated or unsaturated alkyl; R² represents optionally halogenated C₁-C₂₀ saturated or unsaturated alkyl or C₂-C₂₀ alkoxyalkyl; A and B represent each phenylene, etc., or alternatively -A-B- represents naphthylene, etc.; m and s represent each 0 or 1; n represents 0 or an integer of 1 through 6; and the symbol * represents an asymmettric carbon atom.

Description: This invention relates to acetylene derivatives useful as an ingredient of ferroelectric liquid crystal compositions, a process for producing the same, liquid crystal compositions containing said acetylene derivatives as active ingredient, and liquid crystal elements using said liquid crystal compositions. At the present time, TN (twisted nematic) type displaying methods are most widely employed in the field of liquid crystal elements. TN liquid crystal elements have many merits such as lowness in driving voltage, smallness in consumption of electric power, etc. In the point of response speed, however, the TN liquid crystal elements are inferior to luminescence type display elements such as cathode tube, electroluminescence, plasma display and the like. Although a new TN type display element in which the angle of twist is altered to 180° to 270° has been developed, it is still insufficient in response speed. In spite of such endeavors for improvement as the above, a TN type display element having a high response speed is not yet realized. However, there is a possibility of marked improvement in response speed in the new displaying method using a ferroelectric liquid crystal which is energetically being studied in the recent time (Clark et al.; Applied Phys. Lett., 36, 899 (1980)). This method uses a chiral smectic phase exhibiting a ferroelectricity such as chiral smectic C phase (hereinafter, abbreviated to Sc*), etc. It is known that the phase exhibiting a ferroelectricity is not limited to Sc* phase, but chiral smectic F, G, H and I phases and the like also exhibit a ferroelectricity. Ferroelectric liquid crystal materials used in practical ferroelectric liquid crystal elements are required to have many characteristic properties. At the present stage, such requirements cannot fully be satisfied by a single compound, but a ferroelectric liquid crystal composition obtained by mixing together a number of liquid crystal compounds or (non-liquid crystal) compounds must be used for satisfying such requirements. A ferroelectric liquid crystal composition can be obtained not only by using a composition composed of ferroelectric liquid crystal compounds alone. Thus, it has been reported in JP-A-61-195187 that a ferroelectric liquid crystal composition, as a whole, can be obtained by using a compound and composition showing non-chiral smectic C, F, G, H, I phases, etc. (hereinafter, abbreviated to Sc phase, etc.) as a fundamental substance and mixing thereinto one or more compounds showing ferroelectric liquid crystal phase. Further, in another paper (Mol. Cryst. Liq. Cryst., 89, 327 (1982)), it has been reported that a ferroelectric liquid crystal composition, as a whole, can be obtained by using a compound and composition showing the Sc phase, etc. as a fundamental material and mixing thereinto one or more compounds which are optically active and show no ferroelectric liquid crystal phase. Considering these facts collectively, it can be understood that a ferroelectric liquid crystal composition can be constituted by using one or more optically active substances as fundamental material, whether these compounds show ferroelectric liquid crystal phase or not. However, it is desirable that the optically active substance shows a liquid crystal phase and, even if the optically active substance does not show liquid crystal phase, it is a pseudo liquid crystal substance or a substance of which structure resembles that of liquid crystal compound. However, up to today, there has been discovered no liquid crystal material having a spontaneous polarization necessary for a high-speed response, having a low viscosity and showing ferroelectric liquid crystal phase in a sufficiently broad temperature range involving the ambient temperature range. Chemical Abstracts, vol. 113, no. 12, abst. 106585 (1990) discloses optically active diphenyl acetylene derivatives and liquid crystal compositions containing them which show a chiral smectic C phase and are useful for display devices. As a known paper having a relation with this invention, JP-A-4-141969 can be referred to, wherein are disclosed olefin-type liquid crystal compounds and phenylpyrimidine-type compounds obtained by reduction thereof. However, the olefin-type compounds are not satisfactory from the viewpoint of long-term use because they are readily isomerizable or polymerizable by light or heat. Further, since these olefin compounds are produced by Heck reaction, their condensation products can be contaminated by isomers, and production of a high-purity product requires complicated purifying processes such as chromatography, recrystallization, etc. which makes the process unsatisfactory from industrial point of view. It is an object of this invention to provide a compound solving the above-mentioned problems advantageously from industrial point of view. In view of the above, the present inventors have studied a process free from the above-mentioned problems. As a result, it has been found that the object can be achieved in very high purity and yield by using an acetylene derivative. Based on these findings, this invention has been accomplished. Such acetylene derivative is higher in the temperature region of liquid phase exhibition and great in spontaneous polarization, and therefore it is useful as a liquid crystal additive. Thus, this invention relates to an acetylene derivative represented by general formula (I): wherein R 1 represents saturated or unsaturated alkyl group having 3-20 carbon atoms, R 2 represents C 1-20 saturated or unsaturated alkyl group optionally substituted by halogen atom or C 2-20 alkoxyalkyl group, A and B each represents: or A-B, taken conjointly, represents: m and s each represents 0 or 1, n represents an integer of 0-6, and the mark * signifies an asymmetric carbon atom; a process for producing said acetylene derivative (I); a liquid crystal composition containing one of those acetylene derivatives as an active ingredient; and a liquid crystal element using said liquid crystal composition. Next, this invention is detailed. The acetylene derivative (I) of this invention wherein s is 1 can be obtained by reacting an alcohol derivative represented by general formula (III): wherein R 1 , A, B, m, n and the mark * are as defined above, with a carboxylic acid represented by the following general formula: R 2 COR' wherein R 2 is as defined above and R' represents hydroxyl group, OCOR 2 or halogen atom. In the above-mentioned reaction between alcohol derivative (III) and carboxylic acid, the carboxylic acids which can be used include carboxylic acids having an alkyl group represented by R 2 , acid anhydrides thereof and acid halides thereof such as acid chloride and acid bromide. These carboxylic acids may be any of racemic mixture and optically active compound. The above-mentioned reaction is usually carried out in the presence or absence of solvent, generally in the presence of a catalyst. When a solvent is used in the reaction, the solvents which can be used include single members and mixtures thereof of the solvents inert to the reaction such as ethers, ketones, aliphatic and aromatic hydrocarbons, halogenated hydrocarbons, aprotic polar solvents and the like, of which examples include tetrahydrofuran, ethyl ether, acetone, methyl ethyl ketone, toluene, benzene, chlorobenzene, dichloromethane, dichloroethane, chloroform, carbon tetrachloride, dimethylformamide, hexane and the like. The quantity of the solvent is not particularly limited. When an acid anhydride or acid halide of aliphatic carboxylic acid is used in the reaction, its quantity must not be smaller than one equivalent per equivalent of alcohol derivative (III). Although upper limit of its quantity is not particularly limited, the upper limit is preferably 1.1-4 equivalents per equivalent of (III). As the catalyst, organic and inorganic basic substances such as dimethylaminopyridine, 4-pyrrolidinopyridine, triethylamine, tri-n-butylamine, pyridine, picoline, collidine, imidazole, sodium carbonate, sodium methoxide, potassium hydrogen carbonate and the like can be referred to. Organic acids or inorganic acids such as toluenesulfonic acid, methanesulfonic acid, sulfuric acid and the like are also usable as the catalyst. Among these catalysts, pyridine and triethylamine are particularly preferred when an acid halide of carboxylic acid is used as the starting material. The quantity of the catalyst varies depending on the combination of acid anhydride or acid halide of carboxylic acid and catalyst, and cannot always be specified. When an acid halide is used, the quantity of catalyst is at least one equivalent per equivalent of acid halide. When a carboxylic acid is used in the above-mentioned reaction, an acetylene derivative of general formula (I) wherein s is 1 can be obtained by using the carboxylic acid in an amount of 1-2 equivalents per equivalent of alcohol derivative (III) and carrying out a dehydrating condensation reaction in the presence of a condensing agent. As said condensing agent, carbodiimides such as N,N'-dicyclohexylcarbodiimide and N-cyclohexyl-N'-(4-diethylamino)-cyclohexylcarbodiimide are preferably used. If necessary, an organic base such as 4-dimethylaminopyridine, 4-pyrrolidinopyridine, pyridine and triethylamine is used in combination therewith. The condensing agent is used in an amount of 1-1.5 equivalents per equivalent of the carboxylic acid. When said organic base is used in combination with the condensing agent, the organic base is used in an amount of 0.01-0.2 equivalent per equivalent of the condensing agent. The reaction temperature is usually from -30°C to 100°C, and preferably from 0°C to 80°C. The reaction time is not particularly limited, but the point in time when the starting alcohol (III) has disappeared can be taken as end point of the reaction. After completion of the reaction, the acetylene derivative (I) wherein s is 1 can be recovered in a high yield by conventional separating means such as extraction, phase separation, concentration or the like. If necessary, the product may be purified by the method of column chromatography, recrystallization or the like. Next, an acetylene derivative of general formula (I) wherein s is 0 can be produced by reacting an alcohol derivative represented by the above-mentioned general formula (III) with an alkylating agent represented by the following general formula: R 2 -Z wherein R 2 is as defined above and Z represents halogen atom or -OSO 2 R'' in which R'' represents lower alkyl group or optionally substituted phenyl group. Herein, the term "alkylating agent" means a halide or a sulfonic ester having a substituent R 2 . These compounds can be produced from the corresponding alcohol according to known processes. In the alkylating agent, the substituent R2 may be an optically active group. This reaction is usually carried out in the presence of a basic substance. Said alkylating agent is used in an arbitrary amount not smaller than one equivalent per equivalent of alcohol derivative (III). Usually its amount is in the range of from 1 to 5 equivalents. The above-mentioned reaction is usually carried out in the presence of a solvent. Examples of the solvents usable include single members and mixtures thereof the solvents inert to the reaction such as ethers, ketones, aliphatic and aromatic hydrocarbons, halogenated hydrocarbons, aprotic polar solvents and the like, of which examples include tetrahydrofuran, ethyl ether, acetone, methyl ethyl ketone, toluene, benzene, chlorobenzene, dichloromethane, dichloroethane, chloroform, carbon tetrachloride, hexane, dimethylformamide, dimethyl sulfoxide, hexamethylphosphorylamide, N-methylpyrrolidone and the like. The quantity of these solvents is not particularly limited. Examples of the basic substance include alkali metal hydrides such as sodium hydride, potassium hydride and the like, alkali metals such as lithium, sodium, potassium and the like, alkali metal alcoholates such as sodium ethylate, sodium methylate and the like, alkali metal carbonates such as sodium carbonate, potassium carbonate and the like, butyllithium, and the like. The basic substance must be used in an amount of at least one equivalent per equivalent of alcohol derivative (III), and usually in an amount of 1.1-5 equivalents, though the upper limit of its amount is not critical. The reaction temperature is usually in the range of from -50°C to 120°C, and preferably from -30°C to 100°C. The reaction time is not particularly limited, but the point in time when the starting alcohol derivative (III) has disappeared may be taken as end point of the reaction. After completion of the reaction, the objective acetylene derivative represented by general formula (I) wherein s is 0 can be isolated from the reaction mixture according to the conventional separating means such as extraction, phase separation, concentration, etc. If necessary, the product may be purified by column chromatography, recrystallization, etc. In the alkylation reaction, when the substituent Z of the alkylating agent is an iodine atom, silver oxide may be used in place of said basic substance. In this case, said silver oxide must be used in an amount of at least one equivalent per equivalent of alcohol derivative (III). Although upper limit of the amount of the silver oxide is not critical, the upper limit is preferably 5 equivalents per equivalent of alcohol derivative (III). When the alkylation is carried out in the presence of silver oxide, the alkylating agent in which the substituent Z is an iodine atom is used in an arbitrary amount not smaller than one equivalent per equivalent of alcohol derivative (III), and preferably in an amount of 2-10 equivalents per equivalent of the (III). As the reaction solvent, an excessive amount of alkylating agent in which the substituent is iodine atom can be used as a solvent. Apart from it, solvents inert to the reaction such as ethers, ketones, hydrocarbons and the like, of which examples include tetrahydrofuran, ethyl ether, dioxane, acetone, methyl ethyl ketone, benzene, toluene, hexane and the like, may also be used either singly or in the form of mixture. The reaction temperature is usually in the range of from 0°C to 150°C, and preferably from 20°C to 100°C. The reaction time is usually from one hour to 20 days. From the reaction mixture, the acetylene derivative of formula (I) wherein s is 0 is taken out by removing silver salt by filtration and thereafter carrying out conventional after-treatment such as extraction, phase separation, concentration, etc. If necessary, the product may be purified by column chromatography or the like. The process for obtaining an acetylene derivative from alcohol derivative (III) is as has been mentioned above. As examples of the substituent R 2 of the carboxylic acid and the alkylating agent used therein, the following can be referred to: methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, isopentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, propenyl, 2-butenyl, 3-butenyl, 3-hexenyl, 2-butinyl, 3-hexinyl, cyclopropyl, 2,2-dimethylcyclopropyl, cyclopentyl, cyclohexyl, octadecyl, nonadecyl, eicosyl, methoxymethyl, methoxyethyl, methoxypropyl, methoxybutyl, methoxypentyl, methoxyhexyl, methoxyheptyl, methoxyoctyl, methoxynonyl, methoxydecyl, ethoxymethyl, ethoxyethyl, ethoxypropyl, ethoxybutyl, ethoxypentyl, ethoxyhexyl, ethoxyheptyl, ethoxyoctyl, ethoxynonyl, ethoxydecyl, propoxymethyl, propoxyethyl, propoxypropyl, propoxybutyl, propoxypentyl, propoxyhexyl, propoxyheptyl, propoxyoctyl, propoxynonyl, propoxydecyl, butoxymethyl, butoxyethyl, butoxypropyl, butoxybutyl, butoxypentyl, butoxyhexyl, butoxyheptyl, butoxyoctyl, butoxynonyl, butoxydecyl, pentyloxymethyl, pentyloxyethyl, pentyloxypropyl, pentyloxybutyl, pentyloxypentyl, pentyloxyhexyl, pentyloxyheptyl, pentyloxyoctyl, pentyloxynonyl, pentyloxydecyl, hexyloxymethyl, hexyloxyethyl, hexyloxypropyl, hexyloxybutyl, hexyloxypentyl, hexyloxyhexyl, hexyloxyheptyl, hexyloxyoctyl, hexyloxynonyl, hexyloxydecyl, heptyloxymethyl, heptyloxyethyl, heptyloxypropyl, heptyloxybutyl, hexyloxypentyl, octyloxymethyl, octyloxyethyl, octyloxypropyl, decyloxymethyl, decyloxyethyl, decyloxypropyl, 1-methylethyl, 1-methylheptyl, 1-methylbutyl, 1-methylpentyl, 1-methylhexyl, 1-methylheptyl, 1-methyloctyl, 2-methylethyl, 2-methylbutyl, 2,3-dimethylbutyl, 2,3,3-trimethylbutyl, 2-methylpentyl, 3-methylpentyl, 2,3-dimethylpentyl, 2,4-dimethylpentyl, 2,3,3,4-tetramethylpentyl, 2-methylhexyl, 3-methylhexyl, 4-methylhexyl, 2,5-dimethylhexyl, 2-methylheptyl, 2-methyloctyl, 2-trihalomethylpentyl, 2-trihalomethylhexyl, 2-trihalomethylheptyl, 2-haloethyl, 2-halopropyl, 3-halopropyl, 3-halo-2-methylpropyl, 2,3-dihalopropyl, 2-halobutyl, 3-halobutyl, 4-halobutyl, 2,3-dihalobutyl, 2,4-dihalobutyl, 3,4-dihalobutyl, 2-halo-3-methylbutyl, 2-halo-3,3-dimethylbutyl, 2-halopentyl, 3-halopentyl, 4-halopentyl, 5-halopentyl, 2,4-dihalopentyl, 2,5-dihalopentyl, 2-halo-3-methylpentyl, 2-halo- 4-methylpentyl, 2-halo-3-monohalomethyl-4-methylpentyl, 2-halohexyl, 3-halohexyl, 4-halohexyl, 5-halohexyl, 6-halohexyl, 2-haloheptyl, 2-halooctyl and the like, provided that the term "halo" used in these examples means fluorine, chlorine or bromine. Regarding the carboxylic acid, examples of R 2 are the same as the above, in addition to which halomethyl, 1-haloethyl, 1-halopropyl, 1-halobutyl, 1-halopentyl, 1-halohexyl, 1-haloheptyl, 1-halooctyl and the like can also be referred to. These alkyl groups or alkoxyalkyl groups may be of straight chain type, branched chain type or cyclic type. In the cases of branched chain type and cyclic type, the alkyl or alkoxyalkyl group may be optically active. Among the carboxylic acids having substituent R2 exemplified above, some of the optically active carboxylic acids can be obtained by an oxidation of the corresponding alcohols or a reductive deamination of the corresponding amino acids; and some other optically active carboxylic acids can be obtained from the natural world or derived from the following optically active amino acids and optically active oxy acids obtained by optical resolution. Among the alkylating agents having a substituent R 2 , some of the optically active ones can be easily obtained from the corresponding alcohols according to known methods. Among such corresponding alcohols, some ones can be obtained by asymmetric reduction of the corresponding ketones using an asymmetric metallic catalyst or a microorganism or an enzyme; and some others are obtained from the natural world or can be derived from the following optically active amino acids or optically active oxy acids obtained by optical resolution: alanine, valine, leucine, isoleucine, phenylalanine, threonine, allothreonine, homoserine, alloisoleucine, tert-leucine, 2-aminobutyric acid, norvaline, norleucine, ornithine, lysine, hydroxylysine, phenylglycine, aspartic acid, glutamic acid, mandelic acid, tropic acid, 3-hydroxylbutyric acid, malic acid, tartaric acid, isopropylmalic acid and the like. The alcohols represented general formula (III) can be synthesized in the following manner. wherein R 1 , A, B and m are as defined above, X represents halogen atom such as chlorine atom, bromine atom, iodine atom or the like, and R 3 represents lower alkyl group. Now, the condensation reaction in the above-mentioned reaction scheme will be explained in more detail. The compound represented by general formula (VIII) is obtained by reacting a halide represented by general formula (VI) with an acetylene compound represented by general formula (VII) in the presence of a metallic catalyst and a basic substance. The starting compounds represented by general formulas (VI) and (VII) can be produced according to the methods mentioned in literature. The acetylene compound (VII) is used in an amount of usually 0.9-10 equivalents and preferably 1-2 equivalents per equivalent of halide (VI). As the metallic catalyst used in the above reaction, palladium chloride, palladium acetate, triphenylphosphine palladium complex, palladium/carbon and the like can be used in palladium type catalysts, and similar compounds can be used in nickel type and rhodium type catalysts, too. Said metallic catalyst is used in an amount falling in the range of from 0.001 to 0.1 equivalent per equivalent of starting halide (VI). This reaction requires to use, in addition to the above-mentioned metallic catalyst, a trivalent phosphorus compound or a trivalent arsenic compound as a co-catalyst, which are compounds represented by general formula (X): wherein M represents phosphorus atom or arsenic atom, and R 4 , R 5 and R 6 , identical or different, represent alkyl group, aryl group, alkoxy group, aryloxy group or halogen atom. Concrete examples of said compound include tri-n-butylphosphine, triphenylphosphine, tri-o-tolylphosphine, tri-o-tolyl phosphite, phosphorus trichloride, triphenylarsenic and the like. These phosphorus compound or arsenic compound is used in an amount of 0.5-50 equivalents and preferably 10-30 equivalents per equivalent of the above-mentioned metallic catalyst. In addition to these catalysts, a copper catalyst is used. As said copper catalyst, copper iodide, copper bromide, copper oxide, copper cyanide and the like are used. Said copper catalyst is used in an amount falling in the range of from 0.001 to 0.1 equivalent per equivalent of the starting halide (VI). Of course, the copper catalyst may be used in an amount larger than the above, though the use of such a large amount brings about no particular merit. As said basic substance, alkali metal carbonates, carboxylic acid salts, alkoxides, hydroxides and organic bases can be used, among which tertiary amines and secondary amines (organic bases) are preferred. Examples of said organic amines include triethylamine, di-isopropylethylamine, tri-n-butylamine, tetramethylethylenediamine, dimethylaniline and the like. The organic base is used in an amount of 1-5 equivalents per equivalent of halide (VI). If necessary, acetonitrile, tetrahydrofuran, dimethylformamide, hexamethylphosphorylamide, N-methylpyrrolidone, methanol and the like can be used as a reaction solvent. It is also possible to use the above-mentioned basic substance in a large amount as a solvent. Amount of these reaction solvents is not particularly limited. This reaction is usually carried out in an inert gas such as nitrogen, argon, and the like. In this process, yield of the objective compound (VIII) can be improved by elevating the reaction temperature. However, yield of by-products increases at an excessively high temperature. Accordingly, the reaction temperature is usually from 15°C to 190°C, and preferably from 40°C to 150°C. After completion of the reaction, compound (VIII) can be isolated by conventional means such as extraction, distillation, recrystallization, etc. If a compound represented by general formula (XI): wherein n and R 3 are as defined above, is used in place of the compound (VII), the subsequent esterification reaction can be omitted, and an ester derivative (IX) can be obtained. As examples of the acetylene derivative represented by general formula (I) obtained according to the process mentioned above, the following can be referred to: 2-alkyl-5-(4-(3-substituted-1-butynyl)phenyl)-pyrimidine, 2-alkyloxy-5-(4-(3-substituted-1-butynyl)phenyl)-pyrimidine, 5-alkyl-2-(4-(3-substituted-1-butynyl)phenyl)-pyrimidine, 5-alkyloxy-2-(4-(3-substituted-1-butynyl)phenyl)-pyrimidine, 2-(4-alkylphenyl)-5-(3-substituted-1-butynyl)-pyrimidine, 2-(4-alkyloxyphenyl)-5-(3-substituted-1-butynyl)-pyrimidine, 5-(4-alkylphenyl)-2-(3-substituted-1-butynyl)-pyrimidine, 5-(4-alkyloxyphenyl)-2-(3-substituted-1-butynyl)-pyrimidine, 3-(4-alkylphenyl)-6-(3-substituted-1-butynyl)-pyridazine, 3-(4-alkyloxyphenyl)-6-(3-substituted-1-butynyl)-pyridazine, 3-alkyl-6-(4-(3-substituted-1-butynyl))pyridazine, 3-alkyloxy-6-(4-(3-substituted-1-butynyl))-pyridazine, 2-(4-alkylphenyl)-5-(3-substituted-1-butynyl)-pyrazine, 2-(4-alkyloxyphenyl)-5-(3-substituted-1-butynyl)-pyrazine, 5-(4-alkylphenyl)-5-(3-substituted-1-butynyl)-pyrazine, 5-(4-alkyloxyphenyl)-5-(3-substituted-1-butynyl)-pyrazine, 4 '-alkyl-4-(3-substituted-1-butynyl)biphenyl, 4 '-alkyloxy-4-(3-substituted-1-butynyl)biphenyl, 2-alkyl-5-(4-(3-substituted-1-butynyl)phenyl)-pyridine, 2-alkyloxy-5-(4-(3-substituted-1-butynyl)-phenyl)pyridine, 3-alkyl-6-(4-(3-substituted-1-butynyl)phenyl)-pyridine, 3-alkyloxy-5-(4-(3-substituted-1-butynyl)phenyl)-pyridine, 2-(4-alkylphenyl)-5-(3-substituted-1-butynyl)-pyridine, 2-(4-alkyloxyphenyl)-5-(3-substituted-1-butynyl)-pyridine, 3-(4-alkylphenyl)-6-(3-substituted-1-butynyl)-pyridine, 3-(4-alkyloxyphenyl)-6-(3-substituted-1-butynyl)-pyridine, 2-alkyl-6-(3-substituted-1-butynyl)naphthalene, 2-alkyloxy-6-(3-substituted-1-butynyl)naphthalene, 2-alkyl-6-(3-substituted-1-butynyl)quinoxaline, 2-alkyloxy-6-(3-substituted-1-butynyl)quinoxaline, 2-(3-substituted-1-butynyl)-6-alkylquinoxaline, 2-(3-substituted-1-butynyl)-6-alkyloxyquinoxaline, 2-alkyl-6-(3-substituted-1-butynyl)quinazoline, 2-alkyloxy-6-(3-substituted-1-butynyl)quinazoline, 2-(3-substituted-1-butynyl)-6-alkylquinazoline, 2-(3-substituted-1-butynyl)-6-alkyloxyquinazoline, and the compounds in which the (3-substituted-1-butynyl) group of the above-mentioned compounds is replaced by one of (4-substituted-1-pentynyl) group, (5-substituted-1-hexynyl) group, (6-substituted-1-heptynyl) group, (7-substituted-1-octynyl) group, (8-substituted-1-nonynyl) group and (9-substituted-1-decynyl) group. In the compound names shown above, the term "alkyl" means a saturated or unsaturated alkyl having 3-20 carbon atoms; the term "alkyloxy" means a saturated or unsaturated alkyloxy having 3-20 carbon atoms; the term "substituted" means alkyl(R 2 )oxy group or alkyl(R 2 )carbonyloxy group; and the term "alkyl(R 2 )" means a C 1-20 saturated or unsaturated alkyl optionally substituted by halogen atom or C 2-20 alkoxyalkyl group of which examples have been mentioned above. wherein R 1 , R 2 , A, B, m, n, s and the mark * are as defined above. The acetylene alcohol derivative represented by general formula (I'): wherein R O 2 represents C 1-20 saturated or unsaturated alkyl group optionally substituted by halogen atom or C 2-20 alkoxyalkyl group, and R 1 , m, n and the mark * are as defined above, provided that when s is 0, R O 2 may be a hydrogen atom, can be produced according to the process mentioned below. Thus, the acetylene alcohol derivative represented by general formula (I') is obtained by reacting a halide represented by general formula (VI): R 1 -(O) m -A-B-X wherein R 1 , A, B and m are as defined above and X is halogen atom, with an acetylene compound represented by general formula (VII*): wherein R O 2 , n, s and the mark * are as defined above and a palladium catalyst in the presence of a basic substance. Next, the process for producing the acetylene derivative represented by general formula (I') is explained below. Fundamentally, this reaction is similar to the case of the alcohol represented by general formula (III). The starting materials are a halide represented by general formula (VI) and an acetylene compound represented by general formula (VII*). Acetylene compound (VII*) is obtained by, for example, an enzymatic resolution of racemic alcohol, as mentioned below. More concretely saying, esters represented by general formula (VII*) wherein s is 1 are synthesized by acylation, while ethers represented by general formula (VII*) wherein s is 0 are synthesized by alkylation. In the reaction for obtaining acetylene alcohol derivative (I') from halide (VI) and acetylene compound (VII*), the acetylene compound (VII*) is used in an amount of usually 0.9-10 equivalents and preferably 1-2 equivalents, per equivalent of the halide (VI). As the metallic catalyst, palladium chloride, palladium acetate, triphenylphosphine palladium complex, palladium/carbon and the like are used in the palladium type catalysts. Regarding nickel type and rhodium type catalyst, similar catalysts to the above-mentioned ones are used. These metallic catalysts are used in an amount falling in the range of from 0.001 to 0.1 equivalent per equivalent of the starting halide (VI). In this reaction, a trivalent phosphorus compound or a trivalent arsenic compound must be used as a co-catalyst in addition to the above-mentioned metallic catalyst. The co-catalyst is a compound represented by general formula (X): wherein Y represents phosphorus atom or arsenic atom and R 4 , R 5 and R 6 , identical or different, represent alkyl group, aryl group, alkoxy group, aryloxy group or halogen atom. Concrete examples thereof include tri-n-butylphosphine, triphenylphosphine, tri-o-tolylphosphine, tri-o-tolyl phosphite, phosphorus trichloride, triphenylarsene, and the like. The phosphorus compound or arsenic compound is used in an amount of 0.5-50 equivalents and preferably 10-30 equivalents per equivalent of the above-mentioned metallic catalyst. Further, a copper catalyst is used in addition to these catalysts. As said copper catalyst, copper iodide, copper bromide, copper chloride, copper oxide, copper cyanide and the like can be referred to. The copper catalyst is used in an amount of 0.001-0.1 equivalent per equivalent of the starting halide (VI). Of course, the copper catalyst may be used in an amount larger than the above, though the use of such a large amount brings about no particular merit. As the basic substance, carbonates, carboxylates, alkoxides, hydroxides and the like of alkali metals, as well as organic bases, can be referred to. Among these substances, tertiary amines and secondary amines (organic bases) are preferred, of which examples include diethylamine, triethylamine, diisopropylethylamine, tri-n-butylamine, tetramethylethylenediamine, dimethylaniline and the like. The base is used usually in an amount of 1-5 equivalents per equivalent of the halide (VI). If necessary, an appropriate solvent such as acetonitrile, tetrahydrofuran, dimethylformamide, hexamethylphosphorylamide, N-methylpyrrolidone, methanol and the like may be used as a reaction solvent. Further, the above-mentioned bases may also be used as a solvent. The amounts of these reaction solvents are not particularly limited. The reaction is usually carried out in an inert gas such as nitrogen, argon or the like. In the reaction, the yield of the objective compound can be improved by enhancing reaction temperature. However, the yield of by-products increases at an excessively elevated temperature. Accordingly, the reaction temperature is usually 15°C to 160°C, and preferably 30°C to 140°C. After completion of the reaction, optically active acetylene alcohol derivative (I') can be obtained by a conventional means such as extraction, distillation, recrystallization and the like. If necessary, the product can be purified by column chromatography, recrystallization or the like. Next, examples of the compound represented by general formula (I') obtained according to this invention are shown below: 5-alkyl-2-(3-hydroxy-1-butynyl)phenylpyrimidine, 5-alkyloxy-2-(3-hydroxy-1-butynyl)phenylpyrimidine, 2-alkylphenyl-5-(3-hydroxy-1-butynyl)pyrimidine, 2-alkyloxyphenyl-5-(3-hydroxy-1-butynyl)pyrimidine, 2-alkyl-5-(3-hydroxy-1-butynyl)phenylpyrimidine, 2-alkyloxy-5-(3-hydroxy-1-butynyl)phenylpyrimidine, 5-alkylphenyl-2-(3-hydroxy-1-butynyl)pyrimidine, 5-alkyloxyphenyl-2-(3-hydroxy-1-butynyl)pyrimidine, 4 '-alkyl-4-(3-hydroxy-1-butynyl)biphenyl, 4 '-alkyloxy-4-(3-hydroxy-1-butynyl)biphenyl, 2-(4-alkylphenyl)-5-(3-hydroxy-1-butynyl)pyridine, 2-(4-alkyloxyphenyl)-5-(3-hydroxy-1-butynyl)-pyridine, 5-(4-alkylphenyl)-2-(3-hydroxy-1-butynyl)pyridine, 5-(4-alkyloxyphenyl)-2-(3-hydroxy-1-butynyl)-pyridine, 2-alkyl-6-(3-hydroxy-1-butynyl)naphthalene, 2-alkyloxy-6-(3-hydroxy-1-butynyl) naphthalene, 3-alkyl-6-(3-hydroxy-1-butynyl)phenylpyridazine, 3-alkyloxy-6-(3-hydroxy-1-butynyl)phenylpyridazine, 3-(4-alkylphenyl)-6-(3-hydroxy-1-butynyl)-pyridazine, 3-(4-alkyloxyphenyl)-6-(3-hydroxy-1-butynyl)-pyridazine, 2-alkyl-5-(3-hydroxy-1-butynyl)phenylpyrazine, 2-alkyloxy-5-(3-hydroxy-1-butynyl)phenylpyrazine, 2-(4-alkylphenyl)-5-(3-hydroxy-1-butynyl)pyrazine, 2-(4-alkyloxyphenyl)-5-(3-hydroxy-1-butynyl)-pyrazine, 2-alkyl-6-(3-hydroxy-1-butynyl)quinazoline, 2-alkyloxy-6-(3-hydroxy-1-butynyl)quinazoline, 6-alkyl-2-(3-hydroxy-1-butynyl)quinazoline, 6-alkyloxy-2-(3-hydroxy-1-butynyl)quinazoline, 2-alkyl-6-(3-hydroxy-1-butynyl)quinoxaline, 2-alkyloxy-6-(3-hydroxy-1-butynyl)quinoxaline, 6-alkyl-2-(3-hydroxy-1-butynyl)quinoxaline, 6-alkyloxy-2-(3-hydroxy-1-butynyl)quinoxaline, and the compounds in which the substituent (3-hydroxy-1-butynyl) has been replaced by one of 4-hydroxy-1-pentynyl, 5-hydroxy-1-hexynyl, 6-hydroxy-1-heptynyl and 7-hydroxy-1-octynyl groups. In the compound names presented above, the term "alkyl" means saturated or unsaturated alkyl group having 3-20 carbon atoms. Examples of the compound represented by formula (I') further include the following: 5-alkyl-2-(3-substituted-1-butynyl)phenyl-pyrimidine, 5-alkyloxy-2-(3-substituted-1-butynyl)phenyl-pyrimidine, 2-alkylphenyl-5-(3-substituted-1-butynyl)-pyrimidine, 2-alkyloxyphenyl-5-(3-substituted-1-butynyl)-pyrimidine, 2-alkyl-5-(3-substituted-1-butynyl)phenyl-pyrimidine, 2-alkyloxy-5-(3-substituted-1-butynyl)phenyl-pyrimidine, 5-alkylphenyl-2-(3-substituted-1-butynyl)-pyrimidine, 5-alkyloxyphenyl-2-(3-substituted-1-butynyl)-pyrimidine, 4'-alkyl-4-(3-substituted-1-butynyl)biphenyl, 4'-alkyloxy-4-(3-substituted-1-butynyl)biphenyl, 2-(4-alkylphenyl)-5-(3-substituted-1-butynyl)-pyridine, 2-(4-alkyloxyphenyl)-5-(3-substituted-1-butynyl)-pyridine, 5-(4-alkylphenyl)-2-(3-substituted-1-butynyl)-pyridine, 5-(4-alkyloxyphenyl)-2-(3-substituted-1-butynyl)-pyridine, 2-alkyl-6-(3-substituted-1-butynyl)naphthalene, 2-alkyloxy-6-(3-substituted-1-butynyl)naphthalene, 3-alkyl-6-(3-substituted-1-butynyl)phenyl-pyridazine, 3-alkyloxy-6-(3-substituted-1-butynyl)phenyl-pyridazine, 3-(4-alkylphenyl)-6-(3-substituted-1-butynyl)-pyridazine, 3-(4-alkyloxyphenyl)-6-(3-substituted-1-butynyl)-pyridazine, 2-alkyl-5-(3-substituted-1-butynyl)phenylpyrazine, 2-alkyloxy-5-(3-substituted-1-butynyl)phenyl-pyrazine, 2-(4-alkylphenyl)-5-(3-substituted-1-butynyl)-pyrazine, 2-(4-alkyloxyphenyl)-5-(3-substituted-1-butynyl)-pyrazine, 2-alkyl-6-(3-substituted-1-butynyl)quinazoline, 2-alkyloxy-6-(3-substituted-1-butynyl)quinazoline, 6-alkyl-2-(3-substituted-1-butynyl)quinazoline, 6-alkyloxy-2-(3-substituted-1-butynyl)quinazoline, 2-alkyl-6-(3-substituted-1-butynyl)quinoxaline, 2-alkyloxy-6-(3-substituted-1-butynyl)quinoxaline, 6-alkyl-2-(3-substituted-1-butynyl)quinoxaline, 6-alkyloxy-2-(3-substituted-1-butynyl)quinoxaline, and the compounds in which the substituent (3-substituted-1-butynyl) has been replaced by one of 4-substituted-1-pentynyl, 5-substituted-1-hexynyl, 6-substituted-1-heptynyl and 7- substituted-1-octynyl groups. In the compound names presented above, the term "alkyl" means saturated or unsaturated alkyl groups having 3-20 carbon atoms, and the term "substituted" means C 1-20 saturated or unsaturated alkyl or alkylcarbonyl group optionally substituted by halogen atom, or C 2-20 alkoxyalkyl or alkoxyalkylcarbonyl group. The optically active alcohol derivative (III) can be produced by asymmetrically hydrolyzing an ester derivative represented by general formula (IX): wherein R 3 represents a lower alkyl group and R 1 , m, n, A and B are as defined above, with an esterase having an ability to preferentially hydrolyze any one of the optically active isomers of the ester derivative. As used in the invention, the term "esterase" means "esterase in the broad sense", which involves lipase, too. The microorganism producing esterase, used in this invention, may be any of the microorganisms producing an esterase having an ability to asymmetrically hydrolyze esters; and it is not particularly limited. Concrete examples of said microorganism include the microorganisms belonging to, for example, Genus Enterobacter, Genus Arthrobacter, Genus Brevibacterium, Genus Pseudomonas, Genus Alcaligenes, Genus Micrococcus, Genus Chromobacterium, Genus Microbacterium, Genus Corynebacterium, Genus Bacillus, Genus Lactobacillus, Genus Trichoderma, Genus Candida, Genus Saccharomyces, Genus Rhodotolura, Genus Cryptococcus, Genus Torulopsis, Genus Pichia, Genus Penicillium, Genus Aspergillus, Genus Rhizopus, Genus Mucor, Genus Aureobasidium, Genus Actinomucor, Genus Nocardia, Genus Streptomyces, Genus Hansenula and Genus Achromobactor. Culture of the above-mentioned microorganism is usually carried out in the conventional manner by the method of liquid culture, to obtain a culture fluid. For example, a sterilized liquid medium [for molds and yeasts, malt extract-yeast extract medium (5 g of peptone, 10 g of glucose, 3 g of malt extract and 3 g of yeast extract are dissolved in 1 liter of water and pH is adjusted to 6.5) is used; and for bacteria, sugar-boullion medium (10 g of glucose, 5 g of peptone, 5 g of meat extract and 3 g of NaCl are dissolved in 1 liter of water and pH is adjusted to 7.2) is used] is inoculated with a microorganism and subjected to reciprocal shaking culture usually at 20-40°C for 1-3 days. If desired, solid culture may also be carried out. Some of these esterases originated from microorganisms are marketed and readily available commercially. As concrete examples of commercial esterase, the following can be referred to, for example: lipase of Genus Pseudomonas [Lipase P (manufactured by Amano Seiyaku)], lipase of Genus Aspergillus [Lipase AP (manufactured by Amano Seiyaku)], lipase of Genus Mucor [Lipase M-AP (manufactured by Amano Seiyaku)], lipase of Candida cylindrasse [Lipase MY (manufactured by Meito Sangyo)], lipase of Genus Alcaligenes [Lipase PL (manufactured by Meito Sangyo)], lipase of Genus Achromobacter [Lipase AL (manufactured by Meito Sangyo)], lipase of Genus Arthrobacter [Lipase Godo BSL (manufactured by Godo Shusei)], lipase of Genus Chromobacterium (manufactured by Toyo Jozo), lipase of Rhizopus delema [Talipase (manufactured by Tanabe Seiyaku)], and lipase of Genus Rhizopus [Lipase Saiken (manufactured by Osaka Saikin Kenkyusho)]. Animal and vegetable esterases are also usable, of which concrete examples include the following: steapsin, pancreatin, pig liver esterase, and wheat germ esterase. As the esterase used in this reaction, the enzymes obtained from animals, plants and microorganisms can be used. As for the form in use of the esterase, various forms such as purified enzyme, crude enzyme, enzyme-containing material, culture broth of microorganism, culture product, bacterial cell, filtrate of culture broth, and treated products thereof can be adopted in accordance with need. Combinations of an enzyme and a microorganism are also usable. Further, immobilized enzyme and immobilized bacterial cell prepared by immobilizing them on a resin or the like are also usable. The asymmetric hydrolysis is carried out by vigorously stirring a mixture of a starting ester derivative (IX) and the enzyme of a microorganism usually in a buffer solution. As the buffer solution, conventional inorganic acid salt type buffers such as sodium phosphate buffer, potassium phosphate buffer and the like, and organic acid salt buffers such as sodium acetate buffer, sodium citrate buffer and the like are used. As pH value of the buffer solution, pH 8-11 is preferable in the culture fluids of alkaliphilic fungi or alkali esterases, and pH 5-8 is preferable in the culture fluids of non-alkaliphilic microorganisms or esterases having no alkali resistance. Concentration is usually 0.05-2 M and preferably 0.05-0.5 M. The reaction temperature is usually 10°C to 60°C. The reaction time is generally 10-70 hours, though these conditions are not limitative. When a lipase belonging to Genus Pseudomonas or Genus Arthrobacter is used in the asymmetric hydrolysis reaction, an optically active alcohol derivative (III) can be obtained in a relatively high optical purity. In the asymmetric hydrolysis, an organic solvent inert to the reaction such as toluene, chloroform, methyl isobutyl ketone, dichloromethane and the like may be used in addition to the buffer solution. By the use of said organic solvent, the asymmetric hydrolysis can be carried out advantageously. By such asymmetric hydrolysis, either one of the optically active isomers of the starting ester derivative (IX) is preferentially hydrolyzed to form an optically active alcohol derivative represented by general formula (III). On the other hand, the other optical isomer of the starting ester derivative (IX) remains as it is as a residue of hydrolysis. After completion of the hydrolysis, the reaction mixture of hydrolysis is extracted with a solvent such as methyl isobutyl ketone, ethyl acetate, ethyl ether or the like, the solvent is distilled off from the organic layer, and the residue is treated by, for example, column chromatography, whereby the hydrolyzate, namely optically active alcohol derivative (III), can be separated from the residue of hydrolysis, namely optically active ester derivative [namely, the optically active isomer which has not been hydrolyzed among the optically active isomers of the starting ester derivative (IX)]. If necessary, the optically active ester derivative obtained herein may be additionally hydrolyzed to obtain an optically active alcohol derivative (III) which is antipodal to the optically active alcohol obtained above. The starting compound, namely the ester derivative (IX), can be produced by reacting an ester derivative represented by general formula (VIII): wherein R 1 , A, B, m and n are as defined above, with a carboxylic acid represented by general formula (XIII): R 3 COOH wherein R 3 is as defined above, or a derivative thereof. In this acylation reaction, the lower alkylcarboxylic acid (XIII) or its derivative functions as an acylating agent. As said acylating agent, acid anhydride or acid halide of lower alkylcarboxylic acid is usually used. As examples of said acid anhydride and acid halide, acetic anhydride, propionic acid anhydride, acetic acid chloride or bromide, propionic acid chloride or bromide, butyryl chloride or bromide, valeryl chloride or bromide, and the like can be referred to. The reaction between the alcohol derivative (VIII) and lower alkylcarboxylic acid is usually carried out by applying the conditions of esterification, in the presence or absence of a solvent, by the use of a catalyst. When a solvent is used in this reaction, the solvent includes single members and mixtures thereof of the solvents inert to the reaction such as aliphatic and aromatic hydrocarbons, ethers, ketones, halogenated hydrocarbons, aprotic polar solvents and the like of which examples include tetrahydrofuran, ethyl ether, acetone, methyl ethyl ketone, toluene, benzene, chlorobenzene, dichloromethane, dichloroethane, chloroform, carbon tetrachloride, dimethylformamide, hexane and the like. The amount of the solvent is not limited particularly. The lower alkylcarboxylic acid used in the above-mentioned reaction must be used in an amount of one equivalent or more per equivalent of the starting alcohol derivative (VIII). Upper limit of its amount is preferably 4 equivalents, though it is not particularly limited. As the catalyst used in the reaction, organic and inorganic basic substances such as dimethylaminopyridine, triethylamine, tri-n-butylamine, pyridine, picoline, imidazole, sodium carbonate, sodium methylate, potassium hydrogen carbonate and the like can be referred to. Although the amount of the catalyst is not particularly limited, it is usually 1-5 equivalents per equivalent of the alcohol derivative (VIII). When an organic amine is used as the solvent, the amine can function also as a catalyst, in some cases. Acids such as toluenesulfonic acid, methanesulfonic acid, sulfuric acid and the like can also be used as a catalyst. The amount of the catalyst varies with the combination of the lower alkylcarboxylic acid used and the catalyst used, and it cannot be specified always. When an acid halide is used as the lower alkylcarboxylic acid, the catalyst is used in an amount of one equivalent or more per equivalent of the acid halide. The reaction temperature is usually from -30°C to 100°C, and preferably from -20°C to 90°C. The reaction time is not particularly limited, and the point in time when the starting alcohol derivative (VIII) has disappeared may be taken as end point of the reaction. After completion of the reaction, the ester derivative (IX) can be obtained in a high yield by conventional separating means such as extraction, phase separation, concentration, recrystallization, etc. If necessary, the product may be purified by column chromatography or the like, although it is also possible to feed the reaction mixture as it is to the subsequent step. Said ester derivative (IX) can be obtained also by reacting a halide represented by general formula (VI): R 1 -(O) m -A-B-X wherein X represents halogen atom such as chlorine atom, bromine atom, iodine atom or the like and R 1 , A, B and m are as defined above, with an acetylene compound represented by general formula (XI): wherein n and R 3 are as defined above, in the presence of a palladium catalyst and a basic substance. Said alcohol derivative (VIII) can be obtained by reacting halide (VI) with an acetylene compound represented by general formula (VII): wherein n is as defined above. As the palladium catalyst, basic substance and other catalysts used in this reaction, the same ones as the above-mentioned ones can be used. The reaction solvent and the temperature and other conditions of the reaction may be the same as the above. From the reaction mixture thus obtained, said alcohol derivative (VIII) can be obtained in a high yield by phase separation, concentration, distillation, recrystallization or the like. In order to produce the ester derivative (IX) in the subsequent step, it is not always necessary to separate the alcohol derivative (VIII), but the reaction mixture may be fed into the subsequent step as it is. Examples of the compound represented by general formula (III) obtained according to the above-mentioned steps are shown below: 5-alkyl-2-(3-hydroxy-1-butynyl)phenylpyrimidine, 5-alkyloxy-2-(3-hydroxy-1-butynyl)phenylpyrimidine, 2-alkylphenyl-5-(3-hydroxy-1-butynyl)pyrimidine, 2-alkyloxyphenyl-5-(3-hydroxy-1-butynyl)pyrimidine, 2-alkyl-5-(3-hydroxy-1-butynyl)phenylpyrimidine, 2-alkyloxy-5-(3-hydroxy-1-butynyl)phenylpyrimidine, 5-alkylphenyl-2-(3-hydroxy-1-butynyl)pyrimidine, 5-alkyloxyphenyl-2-(3-hydroxy-1-butynyl)pyrimidine, 4'-alkyl-4-(3-hydroxy-1-butynyl)biphenyl, 4'-alkyloxy-4-(3-hydroxy-1-butynyl)biphenyl, 2-(4-alkylphenyl)-5-(3-hydroxy-1-butynyl)pyridine, 2-(4-alkyloxyphenyl)-5-(3-hydroxy-1-butynyl)-pyridine, 5-(4-alkylphenyl)-2-(3-hydroxy-1-butynyl)pyridine, 5-(4-alkyloxyphenyl)-2-(3-hydroxy-1-butynyl)-pyridine, 2-alkyl-6-(3-hydroxy-1-butynyl)naphthalene, 2-alkyloxy-6-(3-hydroxy-1-butynyl)naphthalene, 3-alkyl-6-(3-hydroxy-1-butynyl)phenylpyridazine, 3-alkyloxy-6-(3-hydroxy-1-butynyl)phenylpyridazine, 3-(4-alkylphenyl)-6-(3-hydroxy-1-butynyl)-pyridazine, 3-(4-alkyloxyphenyl)-6-(3-hydroxy-1-butynyl)-pyridazine, 2-alkyl-5-(3-hydroxy-1-butynyl)phenylpyrazine, 2-alkyloxy-5-(3-hydroxy-1-butynyl)phenyl 2-(4-alkylphenyl)-5-(3-hydroxy-1-butynyl)pyrazine, 2-(4-alkyloxyphenyl)-5-(3-hydroxy-1-butynyl)-pyrazine, 2-alkyl-6-(3-hydroxy-1-butynyl)quinazoline, 2-alkyloxy-6-(3-hydroxy-1-butynyl)quinazoline, 6-alkyl-2-(3-hydroxy-1-butynyl)quinazoline, 6-alkyloxy-2-(3-hydroxy-1-butynyl)quinazoline, 2-alkyl-6-(3-hydroxy-1-butynyl)quinoxaline, 2-alkyloxy-6-(3-hydroxy-1-butynyl)quinoxaline, 6-alkyl-2-(3-hydroxy-1-butynyl)quinoxaline, 6-alkyloxy-2-(3-hydroxy-1-butynyl)quinoxaline, and the compounds in which the substituent (3-hydroxy-1-butynyl) group is replaced by any one of 4-hydroxy-1-pentynyl, 5-hydroxy-1-hexynyl, 6-hydroxy-1-heptynyl and 7-hydroxy-1-octynyl groups. Herein, the term "alkyl" in the compound names means saturated or unsaturated alkyl group having 3-20 carbon atoms. The liquid crystal composition of this invention is a composition containing at least one kind of the acetylene derivative represented by general formula (I) as its ingredient. Therein, the compound represented by general formula (I) is used in a proportion ranging from 0.1 to 99.9% by weight and preferably from 1 to 99% by weight, based on the liquid crystal composition obtained therefrom. By using the liquid crystal composition, a liquid crystal element such as photo switching element can be obtained effectively. As for the method for using the liquid crystal composition in these elements, the hitherto known methods can be applied directly without any particular limitation. Even when the acetylene derivative represented by general formula (I) shows no liquid crystal phase in itself alone, it can be made into a liquid crystal composition which can be used without enhancement in viscosity. From the viewpoint of chemical stability, the acetylene derivatives represented by general formula (I) are stabler than olefin type of ones. From the viewpoint of liquid crystal property, n is preferably 1 or greater. Further, when s is equal to 1, the liquid crystal composition is excellent in the action of enhancing spontaneous polarization, and is able to enhance the response speed. Since the acetylene derivative represented by general formula (I) according to this invention, has quite excellent characteristic properties as liquid crystal compound, it can be utilized effectively as liquid crystal composition and as liquid crystal element using the same. Next, this invention is explained in more detail with reference to examples. This invention is by no means limited by these examples. The temperature of phase series is expressed in the term of °C. Example 1 A four-necked flask equipped with a stirring device and a thermometer was charged with 20 g (51.1 mmol) of 2-(4-bromophenyl)-5-decyloxypyrimidine, 6.5 g (76 mmol) of 4-pentyn-2-ol, 0.34 g (1.78 mmol) of copper iodide, 0.67 g (2.55 mmol) of triphenylphosphine, 0.34 g of bis(triphenylphosphine)-palladium (II) chloride and 200 ml of triethylamine. The content of the flask was heated and stirred in an atmosphere of nitrogen at 90°C for 8 hours. After completion of the reaction, the reaction mixture was poured into 200 ml of water, neutralized with dilute sulfuric acid and extracted with toluene-ethyl acetate mixture. The organic solvent layer was washed with water and concentrated under reduced pressure to obtain a yellow-brown colored residue. The residue was purified by silica gel column chromatography using toluene-ethyl acetate mixture as eluent to obtain 16 g (yield 78.6%) of 5-decyloxy-2-(4-(4-hydroxy-1-pentynyl)phenyl)pyrimidine (VIII-1). Then, 8.5 g (21.3 mmol) of the (VIII-1) thus obtained was mixed with 2.80 g of acetic anhydride and 60 ml of pyridine and stirred at 40-50°C for 5 hours. After completion of the reaction, the reaction mixture was poured into 100 ml of water, neutralized with dilute sulfuric acid and extracted with toluene-ethyl acetate mixture. The organic solvent layer thus obtained was washed with water and concentrated under reduced pressure to obtain 9.3 g (yield 98.3%) of 5-decyloxy-2-(4-(4-acetyl-1-pentynyl)phenyl)pyrimidine (IX-1). Then, 8.8 g (20 mmol) of (IX-1) thus obtained was added to a mixture of 150 ml of 0.8M phosphate buffer (pH 7.0), 6 ml of chloroform and 1.5 g of Genus Pseudomonas lipase (Lipase Amano PS) and vigorously stirred at 36-38°C for 30 hours. The mixture was extracted with 200 ml of toluene-ethyl acetate mixture, and the organic layer was washed with water and concentrated under reduced pressure. The mixture thus obtained was separated by silica gel column chromatography using toluene-ethyl acetate mixture as eluent to obtain 3.97 g (yield 47.5%) of (-)-5-decyloxy-2-(4-(4-hydroxy-1-pentynyl)phenyl)-pyrimidine (III-1), [α] D 26 = -7.2° (c=1, chloroform), mp 71-72°C, and 4.27 g (yield 48.5%) of (-)-5-decyloxy-2-(4-(4-acetyloxy-1-pentynyl)phenyl)pyrimidine, [α] D 26 = -9.5° (c=1, chloroform). Then, 0.4 g (1 mmol) of (III-1) thus obtained was dissolved in 10 ml of tetrahydrofuran, 0.05 g (1.2 mmol) of potassium hydride was added, the mixture was stirred at room temperature for one hour, 0.23 g (1.5 mmol) of ethyl iodide dissolved in 3 ml of tetrahydrofuran was added, and the resulting mixture was stirred at room temperature for 3 hours. After completion of the reaction, a small quantity of methanol was added to treat the unreacted potassium hydride, the reaction mixture was poured into 30 ml of water and extracted with 50 ml of ethyl acetate, and the organic layer was washed with water and concentrated under reduced pressure. The mixture thus obtained was separated by silica gel column chromatography using toluene-ethyl acetate mixture as eluent to obtain 0.38 g (yield 85%) of (-)-5-decyloxy-2-(4-(4-ethoxy-1-pentynyl)phenyl)pyrimidine (I-l), [α] D 26 = -5.8° (c=1, chloroform). Example 2 0.4 g (0.1 mmol) of (III-1) obtained in Example 1, 6 g (33 mmol) of butyl iodide and 4 g of silver oxide were charged and reacted at 50°C for 40 hours. The silver oxide was filtered off and further washed with ethyl acetate sufficiently. The filtrate was concentrated and purified by chromatography to obtain 0.35 g (yield 76%) of (-)-5-decyloxy-2-(4-(4-butoxy-1-pentynyl)phenyl)pyrimidine (I-2). [α] D 20 = -5.3° (c=1, chloroform) Example 3 0.4 g (1 mmol) of (III-1) obtained in Example 1 was dissolved in 15 ml of pyridine, 0.2 g of acetyl chloride was added, and the mixture was stirred at 20-30°C for 3 hours. After completion of the reaction, the reaction mixture was diluted with 50 ml of ethyl acetate and washed successively with 3N-HCl, water, 5% aqueous sodium bicarbonate solution and water, and the ethyl acetate layer was concentrated under reduced pressure. The residue was purified by chromatography to obtain 0.42 g (yield 96%) of (+)-5-decyloxy-2-(4-(4- acetoxy-1-pentynyl)phenyl)pyrimidine (I-3). [α] D 20 = +9.8° (c=1, chloroform) Example 4 0.4 g (1 mmol) of (III-1) obtained in Example 1 was dissolved in 10 ml of dimethylformamide, 0.05 g (1.2 mmol) of potassium hydride was added at 10°C, and the mixture was stirred at room temperature for one hour. Then, 0.52 g (2 mmol) of ethoxypropyl tosylate was added and reacted at 30-40°C for 5 hours. After completion of the reaction, after-treatment and purification were carried out in the same manner as in Example 1 to obtain 0.36 g (yield 75%) of (-)-5-decyloxy-2-(4-(4-ethoxypropoxy-1-pentynyl)phenyl)-pyrimidine (I-4). [α] D 20 = -5.3° (c=1, chloroform) Example 5 A four-necked flask equipped with a stirring device and a thermometer was charged with 7.8 g (0.02 mol) of 2-(4-bromophenyl)-5-decyloxypyrimidine, 3.4 g (0.03 mol) of 4-heptyn-6-ol, 0.13 g of bis(triphenyl-phosphine)-palladium chloride, 0.13 g of copper iodide, 0.26 of triphenylphosphine and 50 ml of triethylamine. The content of the flask was reacted under a stream of nitrogen at 80-90°C for 7 hours. After completion of the reaction, the reaction mixture was poured into 200 ml of water, and extracted with 200 ml of toluene. The toluene layer thus obtained was washed with 3% aqueous HCl and water and concentrated under reduced pressure to obtain a brown colored residue. The residue was purified by silica gel column chromatography using toluene-ethyl acetate mixture as eluent to obtain 6.4 g (yield 76%) of 2-(4-(6-hydroxy-1-heptynyl)phenyl)-5-decyloxypyrimidine (VIII-2), mp 82-83°C. Then, 4.2 g (10 mmol) of the (VIII-2) thus obtained, 2 g of acetic anhydride and 20 ml of pyridine were charged and reacted at 50°C for 4 hours. After completion of the reaction, the reaction mixture was poured into 50 ml of water, adjusted to pH 3 with 5% aqueous HCl solution, and extracted with 100 ml of toluene. The organic solvent layer thus obtained was washed with water and concentrated under reduced pressure to obtain 4.6 g (yield 99%) of 2-(4-(6-acetoxy-l-heptynyl)phenyl)-5-decyloxypyrimidine (IX-2), mp 57-58°C. Then, 4.6 g (10 mmol) of the (IX-2) thus obtained was added to a mixture of 160 ml of 0.3M phosphate buffer (pH 7.0), 10 ml of chloroform and 1.4 g of Genus Pseudomonas lipase (Lipase Amano P) and vigorously stirred at 30-35°C for 40 hours. The mixture was extracted with 200 ml of toluene, and the organic layer was washed with water and concentrated under reduced pressure. The residue thus obtained was separated by silica gel column chromatography using toluene-ethyl acetate mixture as eluent to obtain 1.8 g (yield 45%) of (-)-2-(4-(6-hydroxy-1-heptynyl)phenyl)-5-decyloxy-pyrimidine (III-2), [α] D 20 = -3.3° (c=1, chloroform), and 2.4 g (yield 52%) of (-)-2-(4-(6- acetyloxy-1-heptynyl)phenyl)-5-decyloxypyrimidine, [α] D 20 = -1.4° (c=1, chloroform). Then, 0.43 g (1 mmol) of the (III-2) thus obtained was dissolved in a solution consisting of 10 ml of tetrahydrofuran and 1 ml of hexamethylphosphorylamide. Subsequently, 0.05 g (1.2 mmol) of potassium hydride was added thereto at 10°C or below, the mixture was stirred at room temperature for two hour, 0.22 g (2 mmol) of ethyl bromide was added, and the resulting mixture was reacted at room temperature for 3 hours and thereafter at 40°C for 3 hours. After completion of the reaction, the product was after-treated and purified in the same manner as in Example 1 to obtain 0.34 g (yield 75%) of (-)-2-(4-(6-ethoxy-1-heptynyl)phenyl)-5-decyloxypyrimidine (I-7). [α] D 20 = -2.6° (c=1, chloroform). Example 6 0.43 g (1 mmol) of (III-2) obtained above, 5 ml of pyridine and 0.4 g (4 mmol) of acetic anhydride were reacted at 40°C for 5 hours. After completion of the reaction, the reaction mixture was poured into ice water. After adding 20 ml of dichloromethane, the organic layer was washed with 2N-HCl, water, 5% aqueous solution of sodium bicarbonate and water successively. The organic layer was concentrated under reduced pressure and the concentrate was purified by chromatography to obtain 0.45 g (yield 96%) of (+)-2-(4-(6-acetoxy-1-heptynyl)-phenyl)-5-decyloxypyrimidine (I-8). [α] D 20 +1.7° (c=1, chloroform) Example 7 18.2 g (0.05 mol) of 6-decyloxy-2-bromo-naphthalene, 10.5 g (0.15 mol) of 3-butyne-2-ol, 0.4 g of copper iodide, 0.7 g of triphenylphosphine, 0.4 g of bis(triphenylphosphine) palladium chloride and 200 ml of triethylamine were charged and stirred at 80°C for 12 hours in an atmosphere of nitrogen. After completion of the reaction, the reaction mixture was poured into ice-containing aqueous hydrochloric acid and extracted with 200 ml of ethyl acetate. The organic layer was further washed with water and concentrated under reduced pressure. By purifying the residue by column chromatography, 14.6 g (yield 83%) of 6-decyloxy-2-(3-hydroxy-1-butynyl)naphthalene (VIII-3) was obtained, mp 131-132°C . Then, 7.0 g (0.02 mol) of the (VIII-3) thus obtained, 3.9 g (0.03 mol) of propionic acid anhydride, 35 ml of pyridine and 3.5 ml of dimethylaminopyridine were reacted at 30°C for 5 hours. Subsequently, the reaction mixture was worked up and purified in the same manner as in Example 1 to obtain 8.0 g (yield 98%) of 6-decyloxy-2-(3-propionyloxy-1-butynyl)naphthalene (IX-3). mp 74-75°C. Then, a mixed solution consisting of 4.1 g (0.01 mol) of the (IX-3) thus obtained, 120 ml of 0.3M phosphate buffer (pH 7.0), 6 ml of chloroform and 0.8 g of Genus Arthrobacter lipase (manufactured by Shin'nippon Kagaku) was stirred at 35°C for 50 hours. After the reaction, the reaction mixture was worked up and purified in the same manner as in Example 1 to obtain 1.2 g (yield 35%) of (+)-6-decyloxy-2-(3-hydroxy-1-butynyl)naphthalene (III-3), [α] D 20 = +15.9° (c=1, chloroform), and 2.5 g (yield 61%) of (-)-6-decyloxy-2-(3-propionyloxy-1-butynyl)naphthalene, [α] D 20 = -112.5° (c=1, chloroform). Then, 0.35 g (1 mmol) of (III-3), 0.04 g (1.5 mmol) of sodium hydride and 5 ml of dimethylformamide were charged and stirred at 10-20°C for one hour. Subsequently, 0.51 g (3 mmol) of iodopropane was added and reacted at 30-35°C for 5 hours. After completion of the reaction, the mixture was worked up in the same manner as in Example 1 and purified to obtain 0.32 g (yield 82%) of (+)-6-decyloxy-2-(3-propoxy-1-butynyl)naphthalene (I-9). [α] D 20 = +12.4° (c=1, chloroform) Example 8 7.8 g (0.02 mol) of 4-decyloxy-4'-bromobiphenyl, 3.9 g (0.04 mol) of 1-hexin-5-ol, 0.2 g of bis(triphenylphosphine) palladium chloride, 0.25 g of copper iodide, 0.4 g of triphenylphosphine, 30 ml of triethylamine and 10 ml of dimethylformamide were charged and reacted at 80°C for 10 hours under a stream of nitrogen gas. After completion of the reaction, the reaction mixture was poured into 100 ml of water, ethyl acetate was added, and the mixture was weakly acidified with 10% aqueous hydrochloric acid. The organic layer was further washed with water and concentrated under reduced pressure, whereby 6.6 g (yield 81%) of 4-decyloxy-4'-(5-hydroxy-1-hexynyl)-biphenyl (VIII-4) was obtained, mp 97-99°C . Then, 4.1 g (10 mmol) of (VIII-4) thus obtained, water, 60 ml of dichloromethane and 3.0 g of triethylamine were charged, into which was dropwise added 1.6 g (20 mmol) of acetyl chloride at 0-10°C. After the dropping, the mixture was reacted at the same temperature as above for one hour, and thereafter at 25-30°C for 4 hours. After completion of the reaction, the reaction mixture was poured into ice water and pH was adjusted to 4.0 with 5% aqueous HCl solution. The organic layer was washed with water and concentrated under reduced pressure to obtain 4.4 g (yield 98.5%) of 4-decyloxy-4'-(5-acetoxy-1-hexynyl)biphenyl (IX-4), mp 80-82°C. Then, 2.2 g (5 mmol) of (IX-4) thus obtained, 3 ml of chloroform, 80 ml of 2M phosphate buffer (pH 7.0) and 0.4 g of Genus Arthrobacter lipase (manufactured by Shin'nippon Kagaku) were stirred at 30-35°C for 30 hours. After completion of the reaction, the reaction mixture was extracted with ethyl acetate and concentrated under reduced pressure, and the residue was purified by chromatography to obtain 0.9 g (yield 44%) of optically active 4-decyloxy-4'-(5-hydroxy-1-hexynyl)biphenyl (III-4), [α] D 20 = -2.8° (c=1, chloro-form), and 1.2 g (yield 54%) of optically active 4-decyloxy-4'-(5-acetoxy-1-hexynyl)biphenyl, [α] D 20 = -1.2° (c=1, chloroform). Then, 0.05 g (1.2 mmol) of potassium hydride was added to a solution consisting of 0.41 g (1 mmol) of (III-4) obtained above, 8 ml of tetrahydrofuran and 2 ml of dimethylformamide, and the resulting mixture was stirred at room temperature for one hour. Then, 0.37 g (2 mmol) of butyl iodide was added and the whole mixture was reacted at room temperature for 3 hours and thereafter at 40°C for 4 hours. Then, work-up treatment and purification were carried out in the same manner as in Example 1 to obtain 0.35 g (yield 75%) of 4-decyloxy-4'-(5-butoxy-1-hexynyl)biphenyl (I-10). [α] D 20 = -2.1° (c=1, chloroform) Example 9 0.41 g (1 mmol) of (III-4) obtained in Example 8, 10 ml of dichloromethane, 2 ml of pyridine and 0.5 g of 4-N,N-dimethylaminopyridine were charged, and then 0.19 g (1.5 mmol) of (-)-α-chloropropionyl chloride was added thereto at 5-10°C. After maintaining the mixture at the same temperature as above for 3 hours, after-treatment and purification were carried out in the same manner as in Example 3 to obtain 0.45 g (yield 94%) of 4-decyloxy-4'-(5-(α-chloropropionyloxy)-1-hexynyl)-biphenyl (I-11). [α] D 20 = -3.5° (c=1, chloroform) Example 10 7.5 g (0.02 mol) of 3-decyl-6-bromophenyl-pyridazine, 5 g (0.04 mol) of 4-acetoxy-1-pentyne, 0.2 g of bis(triphenylphosphine)palladium chloride, 0.2 g of copper iodide, 0.4 g of triphenylphosphine, 20 ml of triethylamine and 20 ml of N-methylpyrrolidone were charged and reacted at 80°C for 7 hours. After completion of the reaction, work-up treatment and purification were carried out in the same manner as in Example 1 to obtain 7.0 g (yield 83%) of 3-decyl-6-(4-acetoxy-1-pentynyl)phenylpyridazine (IX-5). Subsequently, 4.2 g (0.01 mol) of (IX-5), 4 ml of chloroform, 200 ml of 3M phosphate buffer (pH 7.0) and 0.4 g of Genus Pseudomonas lipase (Amano P) were vigorously stirred at 35-40°C for 40 hours. Thereafter, work-up treatment and purification were carried out in the same manner as in Example 1 to obtain 1.74 g (yield 46%) of (-)-3-decyl-6-(4-hydroxy-1-pentynyl)phenyl-pyridazine (III-5), [α] D 20 = -8.3° (c=1, chloroform), and 2.14 g (yield 51%) of optically active 3-decyl-6-(4-acetoxy-1-pentynyl)phenylpyridazine, [α] D 20 = -13.1° (c=1, chloroform) Subsequently, 0.05 g (1.2 mmol) of potassium hydride was added to a solution consisting of 0.38 g (1 mmol) of (III-5) and 10 ml of tetrahydrofuran, and reacted with 0.23 g (1.5 mmol) of ethyl iodide in the same manner as in Example 1. Thereafter, work-up treatment and purification were carried out in the same manner as in Example 1 to obtain 0.33 g (yield 81%) of (-)-3-decyl-6-(4-ethoxy-1-pentynyl)phenylpyridazine (I-12). [α] D 20 = -6.2° (c=1, chloroform) Example 11 In the same manner as in Example 6, 0.38 g (1 mmol) of (III-5) obtained in Example 10 was acetylated to obtain the following compound: (-)-3-decyl-6-(4-acetoxy-1-pentynyl)phenyl-pyridazine (I-13), [α] D 20 = +14.6° (c=1, chloroform). Examples 12-36 In the same manner as in any one of Examples 1-11, each of the starting materials shown in Table 3 was reacted and after-treated to obtain the results shown in Table 3. Examples 38-39 Using the liquid crystal compounds, the liquid crystal compositions shown in Table 5 were prepared. The compounds were weighed out, heated and melted in a sample bottle and mixed together. [Method for Producing Liquid Crystal Element] A polyimide type polymer film was formed on a glass substrate provided with indium oxide transparent electrode, and rubbed in one direction by means of cotton gauze. A liquid crystal cell was constructed from two glass substrates by using glass fiber having a diameter of 5 µm as a spacer, so that the two substrates became parallel with each other with respect to the direction of rubbing. Then, the above- mentioned composition was sealed into the cell, the liquid crystal element thus formed was combined with a polarizer, an electric field of 20V was applied, and the change in the intensity of transmitting light was followed. The result demonstrated that this element can be used as a switching element. Example 38 Example 39 Referential Example 1 A four-necked flask equipped with a stirring device and a thermometer is charged with 7.8 g (0.02 mol) of 2-(4-bromophenyl)-5-decyloxypyrimidine (VI-1), 0.03 mol of 1-heptyn-6-ol (VII-1), 0.13 g of bis(tri-phenylphosphine)-palladium chloride, 0.13 g of copper iodide, 0.26 g of triphenylphosphine and 50 ml of triethylamine, and the mixture is reacted at 80-90°C for 7 hours under a stream of nitrogen. After the reaction, the reaction mixture is poured into 200 ml of water and extracted with 200 ml of toluene. The toluene layer thus obtained is washed successively with 3% aqueous HCl solution and water and then concentrated under reduced pressure to obtain a brown-colored residue. The residue is purified by silica gel column chromatography using toluene-ethyl acetate as eluent to obtain 64 g (yield 76%) of 2-(4-(6-hydroxy-1-heptynyl)phenyl)-5-decyloxypyrimidine (VIII-1), mp 82-83°C. Then, 4.2 g (10 mmol) of the (VIII-1) thus obtained, 2 g of acetic anhydride and 20 ml of pyridine are charged and reacted at 50°C for 4 hours. After completion of the reaction, the reaction mixture is poured into 50 ml of water, adjusted to pH 3 with 5% aqueous HCl solution, and extracted with 100 ml of toluene. The organic layer is washed with water and concentrated under reduced pressure to obtain 4.6 g (yield 99%) of 2-(4-(6- acetoxy-1-heptynyl)phenyl)-5-decyloxypyrimidine (IX-1), mp 57-58°C. Then, 2.3 g (5 mmol) of the (IX-1) thus obtained is dissolved in a mixture consisting of 80 ml of 0.3M phosphate buffer (pH 7.0), 5 ml of chloroform and 0.7 g of Genus Pseudomonas lipase (Lipase Amano PS) and vigorously stirred at 30-35°C for 40 hours. The mixture is extracted with 100 ml of toluene, and the organic layer is washed with water and concentrated under reduced pressure. The residue is separated by column chromatography using toluene-ethyl acetate to obtain 0.9 g (yield 45%) of (-)-2-{4-(6-hydroxy-1-heptynyl)phenyl}-5-decyloxypyrimidine (III-1), [α] D 20 = -3.3° (c=1, chloroform), and 1.2 g (yield 52%) of (-)-2-(4-(6-acetoxy-1-heptynyl)phenyl)-5-decyloxypyrimidine, [α] D 20 = -1.4° (c=1, chloroform). Referential Example 2 A four-necked flask equipped with a stirring device and a thermometer is charged with 7.3 g (0.02 mol) of 2-(4-bromophenyl)-5-octyloxypyrimidine (VI-4), 6.2 g (0.04 mol) of 6-acetoxy-1-heptyne, 0.15 g of bis(triphenylphosphine)-palladium chloride, 0.15 g of copper iodide, 0.29 g of triphenylphosphine and 50 ml of diethylamine. The mixture is reacted under reflux for 9 hours under a stream of nitrogen gas. After completion of the reaction, work-up treatment and purification are carried out in the same manner as in Referential Example 1 to obtain 6.8 g (yield 78%) of 2-(4-(6-acetoxy-1-heptynyl)phenyl)-5-octyloxypyrimidine (IX-4), mp 58-59°C. Then, a mixture consisting of 2.18 g (5 mmol) of the (IX-4) thus obtained, 50 ml of 0.2M phosphate buffer (pH 7.5), 3 ml of dichloromethane and 0.3 g of Genus Pseudomonas lipase (Lipase Amano PS) is vigorously stirred at 35-40°C for 30 hours. The reaction mixture is extracted with 100 ml of ethyl acetate, and the organic layer is washed with water and concentrated under reduced pressure. The residue is separated by silica gel column chromatography using toluene-ethyl acetate as eluent to obtain 0.91 g (yield 46%) of (-)-2-(4-(6-hydroxy-1-heptynyl)phenyl)-5-octyloxypyrimidine (III-4), [α] D 20 = -2.8° (c=1, chloroform), and 1.13 g (yield 52%) of (-)-2-(4-(6-acetoxy-1-heptynyl)phenyl)-5-octyloxypyrimidine, [α] D 20 = -1.2° (c=1, chloroform). Referential Example 3 18.2 g (0.05 mol) of 6-decyloxy-2-bromo-naphthalene (VI-6), 10.5 g (0.15 mol) of 3-butyne-2-ol, 0.4 g of copper iodide, 0.7 g of triphenylphosphine, 0.4 g of bis(triphenylphosphine)-palladium chloride and 100 ml of diethylamine are charged and stirred for 12 hours under reflux in an atmosphere of nitrogen. After completion of the reaction, the reaction mixture is poured into ice-containing aqueous hydrochloric acid and extracted with 200 ml of ethyl acetate. The organic layer is further washed with water and concentrated under reduced pressure. The residue thus obtained is purified by column chromatography to obtain 14.6 g (yield 83%) of 6-decyloxy-2-(3-hydroxy-1-butynyl)naphthalene (VIII-6), mp 131-132°C. Then, 7.0 g (0.02 mol) of the (VIII-6) obtained above, 3.9 g (0.03 mol) of propionic anhydride, 35 ml of pyridine and 3.5 ml of dimethylaminopyridine are charged and reacted at 30°C for 5 hours. Thereafter, work-up treatment and purification are carried out in the same manner as in Referential Example 1 to obtain 8.0 g (yield 98%) of 6- decyloxy-2-(3-propionyloxy-1-butynyl)naphthalene (IX-6), mp 74-75°C. Then, a mixed solution consisting of 4.1 g (0.01 mol) of the (IX-6) obtained above, 20 ml of 0.3M phosphate buffer (pH 7.0), 6 ml of chloroform and 0.8 g of Genus Arthrobacter lipase (manufactured by Shin'nippon Kagaku) is stirred at 35°C for 50 hours. After completion of the reaction, work-up treatment and purification are carried out in the same manner as in Referential Example 1 to obtain 1.2 g (yield 35%) of 6-decyloxy-2-(3-hydroxy-1-butynyl)naphthalene (III-6), [α] D 20 = +15.9° (c=1, chloroform), and 2.5 g (yield 61%) of 6-decyloxy-2-(3-propionyloxy-1-butynyl)naphthalene, [α] D 20 = -112.5° (c=1, chloroform). Referential Example 4 A four-necked flask equipped with a stirring device and a thermometer is charged with 20 g (51.1 mmol) of 2-(4-bromophenyl)-5-decyloxypyrimidine (VI-7), 12.9 g (153 mmol) of 4-pentyn-2-ol, 0.34 g (1.78 mmol) of copper iodide, 0.67 g (2.55 mmol) of triphenylphosphine, 0.34 g of bis(triphenyl-phosphine) palladium (II) chloride and 200 ml of triethylamine and heated and stirred at 90°C for 8 hours in an atmosphere of nitrogen. After completion of the reaction, the reaction mixture is poured into 200 ml of water, neutralized with dilute sulfuric acid and extracted with toluene-ethyl acetate mixture. The organic layer is washed with water and concentrated under reduced pressure to obtain a yellow-brown colored residue. Purification of the residue by silica gel column chromatography using toluene-ethyl acetate as eluent gives 16.0 g (yield 78.6%) of 5-decyloxy-2-{(4-hydroxy-1-pentynyl)phenyl}pyrimidine (VIII-7). Then, 8.5 g (21.3 mmol) of the (VIII-7) obtained above, 2.80 g of acetic anhydride and 60 ml of pyridine are charged and stirred at 40-50°C for 5 hours. After completion of the reaction, the reaction mixture is poured into 100 ml of water, neutralized with dilute sulfuric acid, and extracted with toluene-ethyl acetate mixture. The organic layer is washed with water and concentrated under reduced pressure to obtain 9.3 g (yield 98.3%) of 5-decyloxy-2-((4-acetyl-1-pentynyl)-phenyl)pyrimidine (IX-7). Then, 8.8 g (20 mmol) of the (IX-7) obtained above is added to a mixture of 150 ml of 0.8M phosphate buffer (pH 7.0), 6 ml of chloroform and 1.5 g of Genus Pseudomonas lipase (Lipase Amano PS) and vigorously stirred at 36-38°C for 30 hours. The resulting mixture is extracted with 200 ml of toluene-ethyl acetate, and the organic layer is washed with water and concentrated under reduced pressure. The mixed product thus obtained is separated by silica gel column chromatography using toluene-ethyl acetate as eluent to obtain 3.79 g (yield 47.5%) of (-)-5-decyloxy-2-{(4-hydroxy-1-pentynyl)phenyl)pyrimidine (III-7), [α] D 26 = -7.2° (c=1, chloroform), mp 71-72°C, and 4.27 g (yield 48.5%) of (-)-5-decyloxy-2-{(4-acetyloxy-1-pentynyl)phenyl)pyrimidine, [α] D 26 = -9.5° (c=1, chloroform). Referential Example 5 7.8 g (0.02 mol) of 4-decyloxy-4'-bromo-biphenyl (VI-8), 3.9 g (0.04 mol) of 1-hexyn-5-ol, 0.2 g of bis(triphenylphosphine)-palladium chloride, 0.25 g of copper iodide, 0.4 g of triphenylphosphine, 30 ml of triethylamine and 10 ml of dimethylformamide are charged and reacted at 80°C for 10 hours under a stream of nitrogen gas. After completion of the reaction, the reaction mixture is poured into 100 ml of water, ethyl acetate is added, and the mixture is weakly acidified with 10% aqueous hydrochloric acid. After separating the mixture into phases, the organic layer is washed with water and concentrated under reduced pressure to obtain 6.6 g (yield 81%) of 4-decyloxy-4'-(5-hydroxy-1-hexynyl)-biphenyl (VIII-8), mp 97-99°C. Then, 60 ml of dichloromethane and 3.0 g of triethylamine are added to 4.1 g (10 mmol) of the (VIII-8) obtained above, to which is dropwise added 1.6 g (20 mmol) of acetyl chloride at 0-10°C. After the dropping, the resulting mixture is reacted at the same temperature as above for one hour and thereafter at 25-30°C for 4 hours. After completion of the reaction, the reaction mixture is poured into ice water, and pH is adjusted to 4.0 with 5% aqueous HCl solution. The organic layer is washed with water and concentrated under reduced pressure to obtain 4.4 g (yield 98.5 %) of 4-decyloxy-4'-(5-acetoxy-1-hexynyl)biphenyl (IX-8), mp 80-82°C. Then, 2.2 g (5 mmol) of the (IX-8) obtained above, 3 ml of chloroform, 80 ml of 2M phosphate buffer (pH 7.0) and 0.4 g of Genus Arthrobacter lipase (manufactured by Shin'nippon Kagaku) are stirred at 30-35°C for 30 hours. After completion of the reaction, the reaction mixture is extracted with ethyl acetate and concentrated under reduced pressure. The residue is purified by chromatography to obtain 0.9 g (yield 44%) of optically active 4-decyloxy-4'-(5-hydroxy-1-hexynyl)biphenyl (III-8), [α] D 20 = -2.8° (c=1, CHCl 3 ), and 1.2 g (yield 54%) of optically active 4-decyloxy-4'-(5-acetoxy-1-hexynyl)biphenyl, [α] D 20 = -1.2° (c=1, CHCl 3 ). Referential Example 6 7.5 g (0.02 mol) of 3-decyl-6-bromophenylpyridazine (VI-10), 5 g (0.04 mol) of 4-acetoxy-1-pentyne, 0.2 g of bis(triphenylphosphine)-palladium chloride, 0.2 g of copper iodide, 0.4 g of triphenylphosphine, 20 ml of triethylamine and 20 ml of N-methylpyrrolidone are charged and reacted at 80°C for 7 hours. After completion of the reaction, work-up treatment and purification are carried out in the same manner as in Referential Example 1 to obtain 7.0 g (yield 83%) of 3-decyl-6-(4-acetoxy-1-pentynyl)-phenylpyridazine (IX-10). The (IX-10) obtained previously can be converted to the following compounds by asymmetrically hydrolyzing, after-treating and purifying it under the same conditions as follows: 2.1 g (5 mmol) of the (IX-10), 2 ml of dichloromethane, 100 ml of 3M phosphate buffer (pH 7.0) and 0.2 g of Genus Pseudomonas lipase (Amano P) are vigorously stirred for 30 hours at 35-40°C. Thereafter, work-up treatment and purification are carried out in the same manner as in Referential Example 2 to obtain 0.8 g (yield 43%) of optically active 3-decyl-6-(4-hydroxy-1-pentynyl)phenylpyridazine (III-10), [α] D 20 = -8.5° (c=1, chloroform); and 1.2 g (yield 55%) of optically active 3-decyl-6-(4-acetoxy-1-pentynyl)-phenylpyridazine, [α] D 20 = -12.6° (c=1, chloroform). Referential Examples 7-15 The optically active alcohol derivatives (III) shown in Table 6 can be obtained by successively repeating the reaction and work-up treatment of Referential Example 2, except that the starting materials shown in Table 6 are used. Referential Examples 16-19 The optically active alcohol derivatives (III) shown in Table 7 can be obtained by successively repeating the reaction and work-up treatment of Referential Example 4, except that the starting materials shown in Table 7 are used. Example 40 A four-necked flask equipped with a stirring device and a thermometer was charged with 7.8 g (0.02 mol) of 2-(4-bromophenyl)-5-decyloxypyrimidine (VI-55), 3.4 g (0.03 mol) of optically active 1-heptyn-3-ol (VII*-55), 0.15 g of bis(triphenylphosphine)-palladium chloride, 0.15 g of copper iodide, 0.28 g of triphenylphosphine and 50 ml of triethylamine. Under a stream of nitrogen gas, the content of the flask was reacted at 80-90°C for 7 hours. After completion of the reaction, the reaction mixture was poured into 200 ml of water and extracted with 200 ml of toluene. The toluene layer thus obtained was washed with 3% HCl solution and water and then concentrated under reduced pressure to obtain a brown colored residue. Purification of the residue by silica gel column chromatography using toluene-ethyl sulfate as eluent gave 6.7 g (yield 79%) of optically active (-)-2-(4-(6-hydroxy-1-heptynyl)phenyl)-5-decyl (I'-55), mp 82-83°C. [α] D 20 = -3.6° (c=1, chloroform). Example 41 A four-necked flask equipped with a stirring device and a thermometer was charged with 7.3 g (0.02 mol) of 2-(4-bromophenyl)-5-octyloxypyrimidine (VI-57), 6.2 g (0.04 mol) of (+)6-acetoxy-1-heptyne (VII*-57), 0.15 g of bis(triphenylphosphine)-palladium chloride, 0.15 g of copper iodide, 0.29 g of triphenylphosphine and 50 ml of diethylamine. The content of the flask was reacted under reflux for 9 hours under a stream of nitrogen gas. After completion of the reaction, work-up treatment and purification were carried out in the same manner as in Example 40 to obtain 6.8 g (yield 78%) of (+)2-(4-(6-acetoxy-1-heptynyl)phenyl)-5-octyloxy-pyrimidine (I'-57), mp 58-59°C, [α] D 20 = +1.5 (c=1, chloroform). Example 42 18.2 g (0.05 mol) of 6-decyloxy-2-bromonaphthalene (VI-59), 10.5 g (0.15 mol) of (+)-3-butyne-2-ol (VII*-59), 0.4 g of copper iodide, 0.7 g of triphenylphosphine, 0.4 g of bis(triphenylphosphine)-palladium chloride and 100 ml of diethylamine were stirred under reflux for 12 hours in an atmosphere of nitrogen gas. After completion of the reaction, the reaction mixture was poured into ice/aqueous hydrochloric acid and extracted with 200 ml of ethyl acetate. The organic layer was further washed with water and concentrated under reduced pressure. The residue was purified by silica gel chromatography using toluene-ethyl acetate as eluent to obtain 14.3 g (yield 81%) of optically active (+)-6-decyloxy-2-(3-hydroxy-1-butynyl)-naphthalene (I'-59), mp 74-75°C, [α] D 20 = +16.9° (c=1, chloroform). Example 43 18.2 g (0.05 mol) of 6-decyloxy-2-bromonaphthalene (VI-60), 15.4 g (0.1 mol) of (+)-2-pentynyloxy-3-butyne (VII*-60), 0.5 g of copper iodide, 0.8 g of triphenylphosphine, 0.4 g of bis(triphenylphosphine)-palladium chloride and 100 ml of triethylamine were stirred under reflux for 7 hours in an atmosphere of nitrogen gas. After completion of the reaction, the reaction mixture was poured into ice-aqueous hydrochloric acid and extracted with 200 ml of ethyl acetate. The organic layer was further washed with water and concentrated under reduced pressure. The residue was purified by silica gel chromatography using toluene-ethyl acetate as eluent to obtain 17.9 g (yield 82%) of optically active (+)-6-decyloxy-2-(3-pentynyl-oxy-1-butynyl)naphthalene (I'-60), [α] D 20 = +93° (c=1, chloroform). Example 44 A four-necked flask equipped with a stirring device and a thermometer was charged with 20 g (51.1 mmol) of 2-(4-bromophenyl)-5-decyloxypyrimidine (VI-61), 12.9 g (153 mmol) of (-)4-pentyn-2-ol (VII*-61), 0.5 g (1.78 mmol) of copper iodide, 0.67 g (2.55 mmol) of triphenylphosphine, 0.4 g of bis(triphenylphosphine)-palladium (II) chloride and 200 ml of triethylamine. The content of the flask was heated and stirred at 90°C for 8 hours in an atmosphere of nitrogen. After completion of the reaction, the reaction mixture was poured into 200 ml of water, neutralized with dilute sulfuric acid and extracted with a mixture of toluene and ethyl acetate. The organic solvent layer thus obtained was washed with water and concentrated under reduced pressure to obtain a yellow-brown colored residue. Purification of the residue by silica gel column chromatography using toluene-ethyl acetate as eluent gave 16.5 g (yield 81%) of (-)5-decyloxy-2-((4-hydroxy-1-pentynyl)phenyl)pyrimidine (I'-61), [α] D 20 = -7.4° (c=1, chloroform), mp 71-72°C. Example 45 7.8 g (0.02 mol) of 4-decyloxy-4'-bromo-biphenyl (VI-62), 4.5 g (0.04 mol) of 5-methoxy-1-hexyne, 0.25 g of bis(triphenylphosphine)-palladium chloride, 0.3 g of copper iodide, 0.45 g of triphenylphosphine, 30 ml of triethylamine and 10 ml of dimethylformamide were charged and reacted at 80°C for 10 hours under a stream of nitrogen gas. After completion of the reaction, the reaction mixture was poured into 100 ml of water, ethyl acetate was added thereto, and the whole was weakly acidified with 10% aqueous hydrochloric acid. The organic layer was further washed with water and concentrated under reduced pressure to obtain 6.7 g (yield 82%) of 4-decyloxy-4'-(5-methoxy-1-hexynyl)biphenyl (I'-62), mp 97-99°C, [α] D 20 = -3.1° (c=1, chloroform). Example 46 7.5 g (0.02 mol) of 3-decyl-6-bromobiphenyl-pyridazine (VI-64), 3.8 g (0.03 mol) of (+)4-acetoxy-1-pentyne, 0.2 g of bis(triphenylphosphine)-palladium chloride, 0.2 g of copper iodide, 0.3 g of triphenylphosphine, 20 ml of diethylamine and 20 ml of N-methylpyrrolidone were charged and reacted under reflux for 10 hours. After completion of the reaction, work-up treatment and purification were carried out in the same manner as in Example 1 to obtain 7.0 g (yield 83%) of (+)-3-decyl-6-(4-acetoxy-1-pentynyl)phenylpyridazine (I'-64), [α] D 20 = 13.0° (c=l, chloroform). Examples 47-58 The optically active acetylene alcohol derivatives (I') shown in Table 8 can be obtained by successively repeating the reaction and work-up treatment of Example 40, except that the starting materials shown in Table 8 are used.

Claims: An acetylene derivative represented by general formula (I): wherein R 1 represents saturated or unsaturated alkyl group having 3-20 carbon atoms, R 2 represents saturated or unsaturated alkyl group having 1-20 carbon atoms which may optionally be substituted by halogen atom or alkoxyalkyl group having 2-20 carbon atoms, A and B each represents or A-B, taken conjointly, represents: m and s each represents 0 or 1, n represents an integer of 0-6, and the mark * means asymmetric carbon atom. A process for producing an acetylene derivative represented by general formula (I) wherein s is 1, characterized by reacting an alcohol derivative represented by general formula (III): wherein R 1 , m, n, A, B and the mark * are as defined above, with a carboxylic acid represented by the following general formula: R 2 COR' wherein R 2 represents saturated or unsaturated alkyl group having 1-20 carbon atoms which may optionally be substituted by halogen atom or alkoxyalkyl group having 2-20 carbon atoms, and R' represents hydroxyl group, OCOR 2 or halogen atom. A process for producing an acetylene derivative represented by general formula (I) wherein s is 0, characterized by reacting an alcohol derivative represented by general formula (III) with an alkylating agent represented by the following general formula: R 2 -Z wherein R 2 represents saturated or unsaturated alkyl group having 1-20 carbon atoms which may optionally be substituted by halogen atom or alkoxyalkyl group having 2-20 carbon atoms, and Z represents halogen atom or -OSO 2 R" in which R" represents lower alkyl group or optionally substituted phenyl group. A liquid crystal composition characterized by containing at least one compound represented by general formula (I) as ingredient. A liquid crystal element using said liquid crystal composition containing at least one compound represented by general formula (I) as ingredient. A process for producing an acetylene alcohol derivative represented by general formula (I'): wherein R 1 , A, B, m, n, s and the mark * are as defined above and R O 2 is as defined below, characterized by reacting a halide represented by general formula (VI): R 1 -(O)m-A-B-X wherein R 1 represents saturated or unsaturated alkyl group having 3-20 carbon atoms, m represents an integer of 0 or 1, A and B each represents or A-B, taken conjointly, represents: and X represents halogen atom, with an acetylene compound represented by general formula (VII*): wherein R 2 / 0 represents saturated or unsaturated alkyl group having 1-20 carbon atoms which may optionally be substituted by halogen atom or alkoxyalkyl group having 2-20 carbon atoms, n represents an integer of 0-6, s represents 0 or 1, and the mark * means asymmetric carbon atom, provided that when s is 0, R 2 / 0may be a hydrogen atom, and a palladium catalyst in the presence of a basic substance. An optically active alcohol derivative represented by general formula (III): wherein R 1 represents saturated or unsaturated alkyl group having 3-20 carbon atoms, m represents 0 or 1, n represents an integer of 0-6, A and B each represents or A-B, taken conjointly, represents: and the mark * means asymmetric carbon atom. A process for producing an optically active alcohol derivative represented by general formula (III) characterized by asymmetrically hydrolyzing an ester derivative represented by general formula (IX): wherein R 1 , m, n, A and B are as defined above and R 3 represents lower alkyl group, by the use of an esterase having an ability to preferentially hydrolyze any one of the optically active isomers of the ester derivative.

Inventors: FUJISAWA KOICHI, HIGASHII TAKAYUKI, MINAI MASAYOSHI, TAKANO NAOYUKI, TODA SHOJI, UEDA KAYOKO, FUJISAWA, KOICHI, HIGASHII, TAKAYUKI, MINAI, MASAYOSHI, TAKANO, NAOYUKI, TODA, SHOJI, UEDA, KAYOKO
Applicants: SUMITOMO CHEMICAL CO, SUMITOMO CHEMICAL COMPANY LIMITED
Application year: 1993
Main classification: C07C41
IPC codes: C07C69, C09K19, C07C43, C07D239, C07D241, C07D213, C07D237