LIQUID-CRYSTAL ALKENYLTOLAN DERIVATIVE, LIQUID-CRYSTAL COMPOSITION, AND LIQUID-CRYSTAL DISPLAY ELEMENT

Abstract: The invention is to provide novel liquid crystalline compounds which have sufficiently high optical anisotropy, high dielectric anisotropy, and large ratio of elastic constants, are excellent in miscibility with other liquid crystal compounds, have low viscosity, and are chemically and physically stable; and to provide liquid crystal compositions comprising the liquid crystalline compound; the liquid crystalline compounds are expressed by the general formula (1) C t H 2t-1 -G-(CH 2 ) m -A 1 -B 1 -(A 2 -B 2 ) n -(A 3 -B 3 ) p -A 4 -X wherein A 1 , A 2 , A 3 , and A 4 independently represent a 1,4-cyclohexylene, 1,4-phenylene in which one or two hydrogen atoms may be replaced by a fluorine atom(s), dioxane-2,5-diyl, or pyrimidine-2,5-diyl group; B 1 , B 2 , and B 3 independently represent a covalent bond, an 1,2-ethylene, 1,2-ethenylene, 1,2-ethynylene, oxymethylene, methylenoxy, carbonyloxy, or 1,4-butylene group provided that at least one of B 1 , B 2 , and B 3 represents an 1,2-ethynylene group; G represents a covalent bond or an oxygen atom; C t H 2t-1 represents an alkenyl group having t carbon atoms wherein t is an integer of 2 to 10; m is an integer of 0 to 2; n and p are independently an integer of 0 or 1; X represents an alkyl group having 1 to 10 carbon atoms, a fluoroalkyl group having 1 to 10 carbon atoms, a chlorine atom, a bromine atom, or a cyano group wherein one or more methylene groups or fluoromethylene groups in the alkyl group or the fluoroalkyl group may be replaced by an oxygen atom(s) or an 1,2-ethenylene group, but adjacent two methylene groups should not be simultaneously replaced by them; provided that when A 4 represents 1,4-phenylene group which is not substituted with a fluorine atom(s), there is no case that G represents a covalent bond and t + m = 3 simultaneously; and each element in the molecule may be its isotope.

Description: TECHNICAL FIELD Present invention relates to a tolan derivative, novel liquid crystalline compounds exhibiting useful physical properties; to liquid crystal compositions comprising the derivative and exhibiting useful physical properties; and to liquid crystal display devices including the liquid crystal composition. BACKGROUND ART Liquid crystal display devices utilize optical anisotropy and dielectric anisotropy of liquid crystalline compounds. As display mode of the devices, twisted nematic (TN) mode, super twisted nematic (STN) mode, dynamic scattering (DS) mode, guest-host (GH) mode, and DAP (Deformation of Aligned Phases) mode have been known. As driving mode for the display devices, static driving mode, time shearing addressing mode, active matrix driving mode, and two-frequency addressing mode have been known. Liquid crystal compositions used for these liquid crystal display devices are required to exhibit liquid crystal phase at wide temperature range and to be stable against heat, light, moisture, air, electric field, and electromagnetic radiation. Accordingly, several kind of liquid crystal compounds are used in combination for display device materials. Sometimes, number of the liquid crystal compounds becomes more than 20 and therefore each of the liquid crystal compounds is required to be good in miscibility with other liquid crystal compounds. Particularly, since the display devices have recently come to be used in severe environments, improvement of miscibility at low temperatures has come to be required. Besides, in keeping with demand for display devices of higher qualities, improvements of liquid crystal compositions in the speed for responding to the change of electric field and in the steepness are required, and thus it has become necessary to control physical properties such as dielectric anisotropy and ratio of elastic constants to most suitable values depending on the display mode and the shape of the devices. Another characteristic required of effective liquid crystal display devices is that the devices have a good display contrast and wide viewing angle. For this purpose, it is necessary to keep the product (Δn · d) of optical anisotropy (Δn) multiplied by cell thickness (d) at a constant value. One method for increasing the response speed is to reduce the cell thickness (d). Accordingly, in order to achieve this purpose while maintaining the product (Δn · d) described above at a desired value, liquid crystal compositions having high Δn are necessary and in order to produce such liquid crystal compositions, liquid crystalline compounds having high Δn become necessary. As compounds having comparatively high Δn, tolan compounds expressed by the general formula (10) are disclosed in Laid-open Japanese Patent Publication No. Sho 61-5031, alkynyloxytolan compounds expressed by the general formula (11) are disclosed in Laid-open Japanese Patent Publication No. Hei 2-207056, alkynyltolan compounds expressed by the general formula (12) are disclosed in Laid-open Japanese Patent Publication No. Hei 2-180840, allylcyclohexyltolan compounds expressed by the general formula (13) are disclosed in Laid-open Japanese Patent Publication No. Hei 3-58944, and fluorotolan type alkenyl compounds expressed by the general formula (14) are disclosed in Laid-open Japanese Patent Publication No. Hei 5-65236, respectively. wherein Rc represents an alkyl group having 1 to 8 carbon atoms, Rd represents an alkenyl group having 2 to 14 carbon atoms, and X represents H or F. However, the compounds expressed by the general formula (10) are not sufficiently high in Δn and dielectric anisotropy, and the compounds expressed by the general formula (11) or (12) have such defects that the viscosity of the compounds is high since they have triple bond at a lateral chain and the compounds are poor in miscibility. With respect to the compounds expressed by the general formula (13), data indicating their liquid crystallinity are not shown. Further, with respect to the compounds expressed by the general formula (14), whereas a fluorine atom(s) is introduced into a benzene ring, the increase of the value of Δn is not sufficient. DISCLOSURE OF THE INVENTION An object of the present invention is to provide novel liquid crystal compounds compensating the defects in the prior art, that is, tolan derivatives which are novel liquid crystalline compounds having a sufficiently high Δn, high dielectric anisotropy, large ratio of elastic constants, excellent miscibility with other liquid crystal compounds, and low viscosity, and being chemically and physically stable. Another object of the present invention is to provide liquid crystal compositions comprising the tolan derivative, and to provide liquid crystal display devices including the liquid crystal composition. As a result of the investigation by the present inventors to solve the problems described above, compounds having a novel structure, and exhibiting improved characteristics compared with known liquid crystalline compounds have been found to accomplish the present invention. The present invention is summarized as follows: (1) A liquid crystalline alkenyltolan derivative expressed by the general formulas (1-b) to (1-g), (1-k) and (1-n) to (1-s) wherein G represents a covalent bond or an oxygen atom; C t H 2t-1 represents an alkenyl group having t carbon atoms wherein t is an integer of 2 to 10; m is an integer of 0 to 2; ; X represents an alkyl group having 1 to 10 carbon atoms, a fluoroalkyl group having 1 to 10 carbon atoms, a chlorine atom, a bromine atom, or a cyano group wherein one or more methylene groups or fluoromethylene groups in the alkyl group or the fluoroalkyl group may be replaced by an oxygen atom(s) or an 1,2-ethenylene group, but adjacent two methylene groups should not be simultaneously replaced by them; wherein in formulas (1-b) , (1-d) , (1-e) , (1-g), (1-k) and (1-n) to (1-s) 1,4-phenylene having F in parenthesis represents 1,4-phenylene in which one or two hydrogen atoms may be replaced by a fluorine. (2) The liquid crystalline alkenyltolan derivative recited in paragraph (1) above wherein G represents a covalent bond, t + m = 4 , and a double bond exists at a terminal of the molecule. (3) The liquid crystalline alkenyltolan derivative recited in paragraph (1) above wherein G represents a covalent bond, t + m = 5 , and a double bond exists at a second position counting from a terminal of the molecule. (4) A liquid crystal composition comprising at least two components and comprising at least one liquid crystalline compound recited in any one of paragraphs (1) to (3) above. (5) A liquid crystal composition comprising, as a first component, at least one liquid crystalline compound recited in any one of paragraphs (1) to (3) above, and comprising, as a second component, at least one compound selected from the group consisting of the. compounds expressed by any one of the general formulas (2), (3), and (4) wherein R 1 represents an alkyl group or alkyloxy group having 1 to 10 carbon atoms; Y represents a fluorine atom or a chlorine atom; Q 1 and Q 2 independently represent a hydrogen atom or a fluorine atom; r is 1 or 2; and Z 1 and Z 2 independently represent a covalent bond or -CH 2 CH 2 -. (6) A liquid crystal composition comprising, as a first component, at least one compound recited in any one of paragraphs (1) to (3) above, and comprising, as a second component, at least one compound selected from the group consisting of the compounds expressed by any one of the general formulas (5), (6), (7) , (8) , and (9) R 5 -(H)-Z 5 -(J)-R 6 wherein R 2 represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and any . methylene group (-CH 2 -) in the alkyl or the alkenyl group may be replaced by an oxygen atom (-O-), but adjacent two or more methylene groups are not replaced by an oxygen atom(s) simultaneously; Z 3 represents a covalent bond, -CH 2 CH 2 -, or -COO- ; Q 3 and Q 4 independently represent a hydrogen atom or a fluorine atom; (E) represents an 1,4-cyclohexylene, 1,4-phenylene, or dioxane-2,5-diyl group; s is 0 or 1; R 3 represents an alkyl.group having 1 to 10 carbon atoms; Q 5 represents a hydrogen atom or a fluorine atom; k is 0 or 1; R 4 represents an alkyl group having 1 to 10 carbon atoms ; (G1) represents an 1,4-cyclohexylene or 1,4-phenylene group; Q 6 and Q 7 independently represent a hydrogen atom or a fluorine atom; Z 4 represents a covalent bond or -COO-; h is 0 or 1; R 5 and R 6 independently represent an alkyl group, alkyloxy group, or alkyloxymethyl group, each having 1 to 10 carbon atoms; (H) represents an 1,4-cyclohexylene, pyrimidine-2,5-diyl, or 1,4-phenylene group; (J) represents an 1,4-cyclohexylene or 1,4-phenylene group; Z 5 represents a covalent bond, -CH 2 CH 2 -, -C≡C-, or -COO-; R 7 represents an alkyl group or alkyloxy group, each having 1 to 10 carbon atoms; R 8 represents an alkyl group, alkyloxy group, or alkyloxymethyl group, each having 1 to 10 carbon atoms; (K) represents an 1,4-cyclohexylene or pyrimidine-2,5-diyl group; (L) and (M) independently represent an 1,4-cyclohexylene or 1,4-phenylene group; Z 6 represents a covalent bond, -CH 2 CH 2 -, or -COO-; Z 7 represents a covalent bond, -C≡C-, or -COO-; and Q 8 represents a hydrogen atom or a fluorine atom. (7) A liquid crystal display device including a liquid crystal composition comprising at least 2 components and comprising at least one liquid crystalline compound recited in any one of paragraphs (1) to (3) above. (8) A liquid crystal display device including a liquid crystal composition recited in any one of paragraphs (4) to (7) above. Any of these compounds of the present invention is characterized by having a high Δn. Also, these compounds are excellent in miscibility with other liquid crystal compounds, are low in viscosity, and are highly stable chemically and physically. Any of liquid crystalline compounds of the present invention exhibits preferable physical properties. Particularly, compounds expressed by the formulas (1-n) to (1-s) can be used for liquid crystal compositions having high upper limit temperature of liquid crystal since they have high clearing point, and compounds expressed by the formula (1-b) can be used for liquid crystal compositions having low upper limit temperature of liquid crystal. When liquid crystal compositions having particularly large positive value of dielectric anisotropy are produced to lower driving voltage of display devices, liquid crystalline compounds having such characteristics (P type compounds) are used. Such purpose can be achieved by introducing a halogen atom or cyano group to X in the general formulas or by introducing 1,4-phenylene ring in which a hydrogen atom(s) is replaced by a fluorine atom(s). Especially, compounds expressed by the formula (1-d), (1-e), (1-g), or (1-k) are P type compounds having particularly remarkable characteristics, and are useful for such purpose. Compounds having negative or small positive dielectric anisotropy (N type compounds) are obtained by introducing an alkyl group having a small dipole moment to X in the general formulas. Particularly, compounds having negative dielectric anisotropy can be obtained by introducing 1,4-phenylene in which a hydrogen atom(s) at 2 and/or 3 position is replaced by a fluorine atom(s). Any compounds expressed by the general formulas have high Δn, and the compounds expressed by the formula (1-p), (1-q), (1-r), or (1-s) are very useful since they have extremely high Δn. Not of all liquid crystalline compounds of the present invention expressed by the general formulas are necessarily exhibit liquid crystal phase. However, any liquid crystalline compounds expressed by the general formulas have good miscibility with other liquid crystal compounds and do not lower or reduce the temperature range of nematic phase of the other liquid crystalline compounds when mixed therewith. Accordingly, the liquid crystalline compounds expressed by the general formulas and having excellent optical characteristics as described above become useful components for liquid crystal compositions even when the compounds themselves do not exhibit liquid crystal phase. Besides, each of the elements in the compounds may be an isotopes since the characteristics of liquid crystalline compounds expressed by the general formulas are not affected even when the element is replaced by the isotope. The liquid crystal compositions of the present invention comprise at least one liquid crystalline compound expressed by the general formulas in a ratio of 0.1 to 99.9 % by weight, and the compositions preferably comprise a first component comprising at least one compound expressed by the general formula (1-b), (1-c) , (1-d) , (1-e) , (1-f) , (1-g) , (1-k) , (1-n) , (1-o), (1-p), (1-q), (1-r), (1-s), and a compound selected from the group consisting of the compounds expressed by any one of the general formulas (2) to (9) depending on the physical properties of liquid crystal compositions to be obtained. As compounds which are preferably used for the liquid crystal compositions of the present invention and are expressed by any one of the general formulas (2) to (4), the following compounds (2-1) to (4-41) can be mentioned as examples: wherein R 1 represents an alkyl group or alkyloxy group having 1 to 10 carbon atoms. Any compounds expressed by any one of the general formulas (2) to (4) have positive dielectric anisotropy and are remarkably excellent in heat stability and chemical stability. When liquid crystal compositions for TFT (AM-LCD) are produced, the compounds are particularly useful since high reliability such as high voltage holding ratio and large resistivity are required for such compositions. Also, when liquid crystal compositions for STN display mode or ordinary TN display mode are produced, compounds expressed by one of the general formulas (2) to (4) can be used. In the liquid crystal compositions of the present invention, the compounds expressed by any one of the general formulas (2) to (4) are used in an amount in the range of 1 to 99 % by weight, preferably 10 to 97 % by weight, and more desirably 40 to 95 % by weight based on the total amount of liquid crystal composition when liquid crystal compositions for TFT are produced. Liquid crystal compositions of the present invention may further comprise compounds expressed by any one of the general formulas (5) to (9). As compounds which are preferably used for the liquid crystal compositions of the present invention and are expressed by any one of the general formulas (5) to (7), the following compounds (5-1) to (7-13) can be mentioned as examples: wherein R 2 represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and any methylene group in the alkyl or alkenyl group may be replaced by an oxygen atom(s), but two or more methylene groups are not continuously replaced by oxygen atom(s); and R 3 and R 4 independently represent an alkyl group having 1 to 10 carbon atoms. Since any compounds expressed by any one of the general formulas (5) to (7) has positive and large value of dielectric anisotropy, the compounds are used particularly for the purpose of lowering threshold voltage of liquid crystal compositions. The compounds are used also for the purpose of widening nematic range such as raising clearing point, and for the purpose of adjusting viscosity, adjusting optical anisotropy, or improving the steepness of threshold characteristics. As the compounds which are preferably used for the liquid crystal compositions of the present invention and expressed by the general formula (8) or (9), the following compounds (8-1) to (9-14) can be mentioned as examples: wherein R 5 and R 6 independently represent an alkyl group, alkyloxy group, or alkyloxymethyl group, each having 1 to 10 carbon atoms; R 7 represents an alkyl group or alkyloxy group, each having 1 to 10 carbon atoms; and R 8 represents an alkyl group, alkyloxy group, or alkyloxymethyl group, each having 1 to 10 carbon atoms. Any compound expressed by the general formula (8) or (9) has negative, or small and positive dielectric anisotropy. The compounds expressed by the general formula (9) are used for the purpose of widening nematic range such as raising clearing point of liquid crystal compositions and/or for the purpose of adjusting optical anisotropy. As described above, any compound expressed by any one of the general formulas (5) to (9) is useful in the production of liquid crystal compositions for ordinary TN display mode, and particularly for STN display mode. In the liquid crystal compositions of the present invention, the compounds expressed by any one of the general formulas (5) to (9) are used in an amount in the range of 1- to 99 % by weight, preferably 10 to 97 % by weight, and more desirably 40 to 95 % by weight based on the total amount of liquid crystal composition when liquid crystal compositions for TN display mode or STN display mode are produced. Further, compounds expressed by any one of the general formulas (2) to (4) may be used together. By using the liquid crystal compositions of the present invention for TFT liquid crystal display devices, the steepness of threshold characteristic, or viewing angle can be improved. The response speed of liquid crystal compositions comprising the compounds are improved, since the compounds expressed by the general formulas have low viscosity. Liquid crystal compositions of the present invention can be produced by conventional methods, for example, a method wherein various components are dissolved each other at high temperature. Further, the liquid crystal compositions of the present invention can be improved or optimized as intended according to their uses by adding a suitable substance. Such additive is well known in the art and described in detail in the literature. For instance, a chiral dopant or the like can be added to induce a helical structure of liquid crystals thereby adjust the required twisting angle, and to avoid the reverse-twist. Further, a dichroic dye such as merocyanine type, styryl type, azo type, azomethine type, azoxy type, quinophthalone type, anthraquinone type, or tetrazine type dye can be added to the liquid crystal compositions of the present invention in the purpose of using the compositions as ones for guest-host (GH) mode. The liquid crystal compositions of the present invention can be used as NCAP prepared by the microencapsulation of a nematic liquid crystal, or as liquid crystal compositions for polymer dispersed liquid crystal display device (PDLCD) represented by polymer network liquid crystal display device (PNLCD) prepared by forming polymers of three-dimensional reticulated structure in a liquid crystal. Further, the liquid crystal compositions of the present invention can be used as ones for electrically controlled birefringence (ECB) mode or dynamic scattering (DS) mode. As nematic liquid crystal compositions comprising the liquid crystalline compounds of the present invention and produced by the methods described above, the following examples of composition can be mentioned: Abbreviation used when the composition examples are indicated are defined in the following Table 1. Composition Example 1 V2-HBTB-2 10.0 % V2-HB(F,F)TB-2 8.0 % V2-HB-C 12.0 % 1V2-HB-C 11.0 % 1V2-BEB(F,F)-C 11.0 % 2-BTB-1 8.0 % 4-BTB-O2 8.0 % 5-BTB-O1 6.0 % 3-HH-4 3.0 % 3-HH-EMe 3.0 % 3-H2BTB-2 4.0 % 3-H2BTB-3 4.0 % 3-H2BTB-4 4.0 % 2-H2BTB-3 4.0 % 2-H2BTB-2 4.0 % Composition Example 2 V2-HBTB-2 10.0 % 3-HB-C 30.0 % 5-HB-C 10.0 % 2-BTB-1 10.0 % 3-HH-4 10.0 % 3-HHB-1 10.0 % 3-HHB-3 11.0 % 3-H2BTB-2 3.0 % 3-H2BTB-3 3.0 % 3-H2BTB-4 3.0 % Composition Example 3 V2-HBTB-2 6.0 % V2-BTB-1 9.0 % 301-BEB(F)-C 11.0 % V2-HB-C 11.0 % 3-HB-02 3.0 % 2-BTB-01 5.0 % 3-BTB-01 5.0 % 4-BTB-01 5.0 % 4-BTB-02 5.0 % 5-BTB-01 5.0 % 3-HHB-01 3.0 % 3-H2BTB-2 2.0 % 3-H2BTB-3 3.0 % 3-H2BTH-4 3.0 % 3-HB(F)TB-2 4.0 % 3-HB(F)TB-3 4.0 % 3-HB(F)TB-4 4.0 % 2-PyBH-3 4.0 % 3-PyBH-3 4.0 % 3-PyBH-2 4.0 % Composition Example 4 V2-HBTB-1 5.0 % 3-DB-C 10.0 % 4-DB-C 10.0 % 2-BEB-C 12.0 % 3-BEB-C 4.0 % 3-HHEBB-C 3.0 % 5-HHEBB-C 3.0 % 5-HEB-F 3.0 % 3-PyB(F)-F 6.0 % 3-HEB-O4 8.9 % 4-HEB-O2 5.9 % 5-HEB-O1 5.9 % 3-HEB-O2 5.4 % 5-HEB-O2 5.9 % 1O-BEB-2 3.0 % 5-HEB-1 3.0 % 4-HEB-4 5.0 % Composition Example 5 V1O-HBTB-1 4.0 % V2-DBTB-CL 3.0 % 3-HHEB-F 2.0 % 3-HBEB-F 2.0 % 3-HHB-F 4.0 % 3-HB-O2 14.0 % 3-HB-O4 13.0 % 3-PyB-4 3.1 % 4-PyB-4 3.1 % 6-PyB-4 3.2 % 3-PyB-5 3.2 % 4-PyB-5 3.2 % 6-PyB-5 3.2 % 6-PyB-O5 6.0 % 6-PyB-O6 6.0 % 6-PyB-O7 6.0 % 6-PyB-O8 6.0 % 2-HHB-1 4.0 % 3-HHB-3 6.0 % 3-HHB-O1 5.0 % Composition Example 6 V2-BTB-1 8.0 % V2-HBTB-2 5.0 % 7-HB(F)-F 14.0 % 2-HHB(F)-F 10.0 % 3-HHB(F)-F 10.0 % 5-HHB(F)-F 10.0 % 2-H2HB(F)-F 6.0 % 3-H2HB(F)-F 3.0 % 5-H2HB(F)-F 6.0 % 2-HBB(F)-F 7.0 % 3-HBB (F)-F 7.0 % 5-HBB(F)-F 14.0 % Composition Example 7 V2-HBTB-CL 6.0 % V2-HBTH-1 3.0 % 5-HB-CL 7.0 % 7-HB(F,F)-F 10.0 % 2-HBB(F)-F 8.0 % 3-HBB(F)-F 8.0 % 5-HBB(F)-F 16.0 % 4-HHB-CL 10.0 % 5-HHB-CL 5.0 % 3-HBB(F,F)-F 11.0 % 5-HBB(F,F)-F 11.0 % 3-HB(F)VB-2 5.0 % Composition Example 8 1V2-HBTB-1 5.0 % 5-H2B(F)-F 4.0 % 2-HHB(F)-F 12.0 % 3-HHB(F)-F 12.0 % 5-HHB(F)-F 12.0 % 2-HHB(F)-F 4.0 % 3-HHB(F)-F 4.0 % 5-HHB(F)-F 8.0 % 4-H2BB(F)-F 4.0 % 3-HBB(F,F)-F 7.0 % 5-HBB(F,F)-F 4.0 % 3-HH2B(F,F)-F 9.0 % 5-HH2B(F,F)-F 6.0 % 5-H2BB(F,F)-F 5.0 % 3-HHB-F 2.0 % 5-HHEBB-F 2.0 % Composition Example 9 V2-HBTB-CL 5.0 % V2-DBTB-CL 5.0 % 5-HB-F 7.0 % 3-HH-O1 7.0 % 3-HH-O3 6.0 % 3-HHB-OCHF2 3.0 % 5-HHB-OCHF2 4.0 % 3-HHB(F,F)-OCHF2 8.0 % 5-HHB (F, F) -OCHF2 8.0 % 2-HHB-OCF3 6.0 % 3-HHB-OCF3 7.0 % 4-HHB-OCF3 6.0 % 5-HHB-OCF3 6.0 % 3-HH2B(F)-F 7.0 % 5-HH2B(F)-F 9.0 % 3-HHEB(F)-F 6.0 % Composition Example 10 V2-HBTB-2 5.0 % V2-HBTB-1 5.0 % V-HB-C 10.0 % 1V-HB-C 5.0 % 5-BB-C 5.0 % 2-HB(F)-C 5.0 % 4-BB-3 3.0 % 3-H2B-O2 5.0 % 5-H2B-O2 5.0 % 3-BEB-C 5.0 % 5-HEB-O1 8.0 % 5-HEB-O3 8.0 % 5-BBB-C 5.0 % 4-BPyB-C 4.0 % 4-BPyB-5 4.0 % 5-HB2B-4 5.0 % 5-HBB2B-3 3.0 % 1V-HH-1O1 5.0 % 1V2-HBB-3 5.0 % Composition Example 11 V2-BTB-1 8.0 % V1O-HBTB-1 8.0 % 4-HEB(F)-F 8.0 % 5-HEB(F)-F 8.0 % 2-BEB(F)-C 5.0 % 3-BEB(F)-C 5.0 % 5-BEB(F)-C 8.0 % 1O3-HB(F)-C 6.0 % 3-HHEB(F)-F 5.0 % 5-HHEB(F)-F 5.0 % 2-HBEB(F)-C 5.0 % 3-HBEB(F)-C 6.0 % 5-HBEB(F)-C 5.0 % 3-HBTB-2 10.0 % V2-HH-3 4.0 % V2-HHB-1 4.0 % As described below, the compounds of the present invention expressed by the general formulas can be produced by known general methods of organic synthesis. Compounds expressed by the general formulas can readily be synthesized by coupling an acetylene derivative and a halide in a solvent in the presence of a catalyst of transition metal complex and a promotor added when necessary, according to, for example, a method described in Tetrahedron Lett., vol. 22, p 305 (1981). As the complex catalyst described above, for example, a zero valent or divalent palladium complex such as dichlorobistriphenylphosphine palladium, tetrakistriphenylphosphine palladium, palladium acetate, and kahrasch complex can be mentioned. Whereas the amount of the complex catalyst to be used depends on the reactivity of substrates and is not constant, it is suitably in the range of 0.1 to 20 % by mol in general, and preferably in the range of 0.5 to 5 % by mol, particularly since conversion time is short and besides, side reactions hardly occur. As the promotor, a copper salt such as copper iodide and copper bromide is preferable to increase the yield. As the solvent, while diethylamine is most suitable in general, a polar solvent such as triethylamine, pyridine, morpholine, and dimethyl formamide or a mixed solvent of one of these solvents with another suitable solvent can also be used. While reaction temperature is suitably in the range of -40°C to boiling point of the solvent employed, it is preferably a temperature between 0°C and the boiling point of the solvent in particular since the catalyst activity is satisfactorily maintained and the conversion is high. Further, the reaction described above is preferably carried out in an inert gas since the active site of the catalyst is unstable against air and moisture. When a compound of the formulas of the present invention is isolated after finishing of the reaction, it is particularly preferable to conduct, after ordinary treatments, purification such as distillation, recrystallization, or column chromatography to separate the catalyst remaining in the reaction system. For example, the halogeizized vinyl derivative can readily be synthesized by the known reaction of a phosphonium salt which can readily be prepared according to a method described in Organic Reactions, vol. 14, p 270 (1965), with an aldehyde which can readily be prepared according to a method described in Shin-Jikken Kagaku Kouza (Course of New Chemical Experiment), vol. 14, p 633 (1977), in a suitable solvent in the presence of a base such as potassium-t-butoxide. Objective compounds of the formulas can readily be produced by dehydrohalogenation in a suitable solvent in the presence of a base such as potassium-t-butoxide or sodium amide according to a method described in Shin-Jikken Kagaku Kouza, vol. 14, p 253 (1977). After the reaction, the compounds of the general formulas. can be isolated with ordinary treatments and purification such as distillation, recrystallization, or column. Precursors which are starting materials for compounds expressed by general formulas are synthesized by the following method: [Case wherein G represents a covalent bond and a double bond exists at a terminal of an alkenyl group (C t H 2t-1 ) in the general formulas] For example, alkenyl compounds can readily be synthesized by the reaction of an aldehyde derivative which can readily be prepared according to a method described in Japanese Patent Publication No. Hei 4-30382 or Japanese Patent Application No. Hei 7-180745 with methyltriphenylphosphonium bromide in a suitable solvent in the presence of a base such as potassium-t-butoxide. [Case wherein G represents a covalent bond and a double bond does not exist at a terminal of an alkenyl group (C t H 2t-1 ) in the general formulas] Alkenyl compounds can readily be synthesized by the reaction of an aldehyde derivative with diiodide in the presence of chrome (II) dichloride according to, for example, a method described in J. Am. Chem. Soc. vol. 109, p 951 (1987). [Case wherein G represents oxygen atom in the general formulas] Alcohol derivatives can readily be synthesized by the reduction of an aldehyde derivative which can readily be prepared, for example, by a method described in Japanese Patent Publication No. Hei 4- 30382 or Japanese Patent Application No. Hei 7-180745 with a reducing agent such as sodium borohydride according to, for example, a method described in J. Am. Chem. Soc., vol. 71, p 122 (1949) or ibid. vol. 74, p 3630 (1952). Then, the target compounds can readily be synthesized by reacting an alcohol derivative with an alkenyl halide in the presence of a base such as sodium hydride according to a method described in Shin-Jikken Kagaku Kouza vol. 19, p 176 (1957). Alkenyl compounds thus synthesized can readily be converted into acetylene derivatives according to, for example, a method described in J. Am. Chem. Soc., vol. 84, p 1745 (1962) and Tetrahedron Lett., vol. 36, p 3769 (1972), or into phosphonium salts according to a method described in Organic Reactions, vol. 5, p 1 (1949) and ibid., vol. 14, p 270 (1965), after converting their cyano group into aldehyde group by treating with a reducing agent such as diisobutyl aluminum hydride according to, for example, a method described in J. Org. Chem., vol. 24, p 627 (1959). Now, the methods for producing the compounds of the present invention and use examples of the compounds will be described in more detail with reference to Examples. In each of the Examples, C indicates crystal, N nematic phase, S smectic phase, and I isotropic liquid; and unit of every phase transition temperature is C. Example 1 Synthesis of 4-(trans-4-(3-butenyl)cyclohexyl)-4'-ethyltolan (Compound expressed by the general formula (1-c) wherein G represents a covalent bond; m is 2; t is 2; and X represents ethyl group. Compound No. 18) Degasified diethyl amine was added to a mixture of dichlorobistriphenylphosphine palladium (0.19 mmol) and copper iodide (0.03 mmol), and stirred under argon gas at room temperature for 15 min. To the mixture was added 4-ethyliodobenzene, and they were stirred at room temperature for further 30 min. To this reaction mixture was added 1-ethynyl-4-(trans-4-(3-butenyl)cyclohexyl)benzene, and they were stirred at room temperature one night. After finishing of the reaction, the solvent was distilled off, and the product was purified by column chromatography (silica gel/heptane) and then recrystallized from heptane to obtain colorless crystals (yield 89 %). Various kind of spectral data of this compound well supported its structure. Phase transition point C· 58.9 ·S· 115.1 ·N· 175 ·I Example 2 According to the method of Example 1, 4-(trans-4-(3-E-pentenyl)cyclohexyl)-4'-ethyltolan (Compound No. 19) was synthesized by using 1-ethynyl-4-(trans-4-(3-E-pentenyl) cyclohexyl)benzene in place of 1-ethynyl-4-(trans-4-(3-butenyl)cyclohexyl)benzene. Example 3 According to the method of Example 1, 4-(trans-4-(2-propenyloxymethyl)cyclohexyl)-4'-ethyltolan (Compound No. 28) was synthesized by using 1-ethynyl-4-(trans-4-(propenyloxymethyl) cyclohexyl)benzene in place of 1-ethynyl-4-(trans-4-(3-butenyl)cyclohexyl)benzene. Example 4 According to the method of Example 1, 4-(trans-4-(3-butenyl)cyclohexyl)-4'-ethoxytolan (Compound No. 29) was synthesized by using 4-ethoxyiodobenzene in place of 4-ethyliodobenzene. Example 5 According to the method of Example 1, 4-(trans-4-(3-butenyl)cycloheyxl)-4'-cyanotolan (Compound No. 33) was synthesized by using 4-cyanoiodobenzene in place of 4-ethyliodobenzene. Example 6 According to the method of Example 1, 4-(trans-4-(3-butenyl)cyclohexyl)-4'-chlorotolan (Compound No. 35) was synthesized by using 4-chloroiodobenzene in place of 4-ethyliodobenzene. Example 7 According to the method of Example 1, 4-(trans-4-(3-butenyl)cyclohexyl)-4'-trifluoromethyltolan (Compound No. 39) was synthesized by using 4-trifluoromethyliodobenzene in place of 4-ethyliodobenzene. According to Examples 1 to 7 described above, the following compounds are synthesized: Compound No. 1 1-(trans-4-(3-butenyl)cyclohexyl)ethynyl-4-ethylbenzene Compound No. 2 1-(trans-4-(3-E-pentenyl)cyclohexyl)ethynyl-4-ethylbenzene Compound No. 3 1- (trans-4-(3-butenyl)cyclohexyl) ethynyl-4-propylbenzene Compound No. 4 1- (trans-4-(3-E-pentenyl)cyclohexyl)ethynyl-4-propylbenzene Compound No. 5 1-(trans-4-(3-butenyl)cyclohexyl)ethynyl-4-ethoxybenzene Compound No. 6 1- (trains-4-(3-E-pentenyl)cyclohexyl)ethynyl-4-ethoxybenzene Compound No. 7 1-(trans-4-(3-butenyl)cyclohexyl)ethynyl-4-cyanobenzene Compound No. 8 1-(trans-4-(3-E-pentenyl)cyclohexyl)ethynyl-4-cyanobenzene Compound No. 9 1-(trans-4-(3-butenyl)cyclohexyl)ethynyl-4-chlorobenzene Compound No. 10 1-(trans-4-(3-E-pentenyl)cyclohexyl)ethynyl-4-chlorobenzene Compound No. 11 1-(trans-4-(3-butenyl)cyclohexyl)ethynyl-4-trifluoromethylbenzene Compound No. 12 1-(trans-4-(3-E-pentenyl)cyclohexyl)ethynyl-4-trifluoromethylbenzene Compound No. 13 1-(trans-4-(3-butenyl)cyclohexyl)ethynyl-4-trifluoromethoxybenzene Compound No. 14 1-(trans-4-(3-E-pentenyl)cyclohexyl)ethynyl-4-trifluoromethoxybenzene Compound No. 15 1-(trans-4-(3-butenyl)cyclohexyl)ethynyl-4-(1-fluoro-2,2,2-trifluoroethyl)oxybenzene Compound No. 16 1-(trans-4-(3-E-pentenyl)cyclohexyl)ethynyl-4-(1-fluoro-2,2,2-trifluoroethyl)oxybenzene Compound No. 17 4-(trans-4-(3-butenyl)cyclohexyl)-4'-methyltolan Compound No. 18 4-(trans-4-(3-butenyl)cyclohexyl)-4'-ethyltolan Compound No. 19 4-(trans-4-(3-E-pentenyl)cyclohexyl)-4'-ethyltolan Compound No. 20 4-(trans-4-(3-butenyl)cyclohexyl)-4'-propyltolan Compound No. 21 4-(trans-4-(3-E-pentenyl)cyclohexyl)-4'-propyltolan Compound No. 22 4-(trans-4-(3-butenyl)cyclohexyl)-4'-butyltolan Compound No. 23 4-(trans-4-(3-butenyl)cyclohexyl)-4'-pentyltolan Compound No. 24 4-(trans-4-(3-butenyl)cyclohexyl)-4'-(3-butenyl)tolan Compound No. 25 4-(trans-4-(2-propenyl)cyclohexyl)-4'-ethyltolan Compound No. 26 4-(trans-4-(7-octenyl)cyclohexyl)-4'-ethyltolan Compound No. 27 4-(trans-4-(7-E-nonenyl)cyclohexyl)-4'-ethyltolan Compound No. 28 4-(trans-4-(2-propenyloxymethyl)cyclohexyl)-4'-ethyltolan Compound No. 29 4-(trans-4-(3-butenyl)cyclohexyl)-4'-ethoxytolan Compound No. 30 4-(trans-4-(3-E-pentenyl)cyclohexyl)-4'-ethoxytolan Compound No. 31 4-(trans-4-(3-butenyl)cyclohexyl)-4'-propoxytolan Compound No. 32 4-(trans-4-(3-E-pentenyl)cyclohexyl)-4'-propoxytolan Compound No. 33 4-(trans-4-(3-butenyl)cyclohexyl)-4'-cyanotolan Compound No. 34 4-(trans-4-(3-E-pentenyl)cyclohexyl)-4'-cyanotolan Compound No. 35 4-(trans-4-(3-butenyl)cyclohexyl)-4'-chlorotolan Compound No. 36 4-(trans-4-(3-E-pentenyl)cyclohexyl)-4'-chlorotolan Compound No. 37 4-(trans-4-(3-butenyl)cyclohexyl)-4'-bromotolan Compound No. 38 4-(trans-4-(3-E-pentenyl)cyclohexyl)-4'-bromotolan Compound No. 39 4-(trans-4-(3-butenyl)cyclohexyl)-4'-trifluoromethyltolan Compound No. 40 4-(trans-4-(3-E-pentenyl)cyclohexyl)-4'-trifluoromethyltolan Compound No. 41 4-(trans-4-(3-butenyl)cyclohexyl)-4'-trifluoromethoxytolan Compound No. 42 4-(trans-4-(3-E-pentenyl)cyclohexyl)-4'-trifluoromethoxytolan Compound No. 43 1-(trans-4-(trans-4-(3-butenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-ethylbenzene Compound No. 44 1-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-ethylbenzene Compound No. 45 1-(trans-4-(trans-4-(3-butenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-ethoxybenzene Compound No. 46 1-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-ethoxybenzene Compound No. 47 1-(trans-4-(trans-4-(3-butenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-cyanobenzene Compound No. 48 1-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-cyanobenzene Compound No. 49 1-(trans-4-(trans-4(3-butenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-chlorobenzene Compound No. 50 1-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-chlorobenzene Compound No. 51 1-(trans-4-(trans-4-(3-butenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-trifluoromethylbenzene Compound No. 52 1-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-trifluoromethylbenzene Compound No. 53 1-(trans-4-(trans-4-(3-butenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-trifluoromethoxybenzene Compound No. 54 1-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-trifluoromethoxybenzene Compound No. 55 1-(trans-4-(trans-4-(3-butenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-(1-fluoro-2,2,2-trifluoroethyl)oxybenzene Compound No. 56 1-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-dioxane-1-yl)ethynyl-4-(1-fluoro-2,2,2-trifluoroethyl)oxybenzene Compound No. 57 1-(4-(trans-4-(3-butenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-ethylbenzene Compound No. 58 1-(4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-ethylbenzene Compound No. 59 1-(4-(trans-4-(3-butenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-ethoxybenzene Compound No. 60 1-(4-(trans-4-(3-E-pentenyl)cylohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-ethoxybenzene Compound No. 61 1-(4-(trans-4-(3-butenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-cyanobenzene Compound No. 62 1-(4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-cyanobenzene Compound No. 63 1-(4-(trans-4-(3-butenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-chlorobenzene Compound No. 64 1-(4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-chlorobenzene Compound No. 65 1-(4-(trans-4-(3-butenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-trifluoromethylbenzene Compound No.66 1-(4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-trifluoromethylbenzene Compound No. 67 1-(4-(trans-4-(3-butenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-trifluoromethoxybenzene Compound No. 68 1-(4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-trifluoromethoxybenzene Compound No. 69 1-(4-(trans-4-(3-butenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-(1-fluoro-2,2,2-trifluoroethyl)oxybenzene Compound No. 70 1-(4-(trans-4-(3-E-pentenyl)cyclohexyl)-2,5-pyrimidine-1-yl)ethynyl-4-(1-fluoro-2,2,2-trifluoroethyl)oxybenzene Compound No. 71 4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)-4'-methyltolan Compound No. 72 4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)-4'-methyltolan Compound No. 73 4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)-4'-propyltolan Compound No. 74 4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)-4'-propyltolan Compound No. 75 4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)-4'-ethoxytolan Compound No. 76 4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)-4'-ethoxytolan Compound No. 77 4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)-4'-cyanotolan Compound No. 78 4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)-4'-cyanotolan Compound No. 79 4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)-4'-chlorotolan Compound No. 80 4- (2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)-4'-chlorotolan Compound No. 81 4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)-4'-trifluoromethyltolan Compound No. 82 4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)-4'-trifluoromethyltolan Compound No. 83 4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)-4'-trifluoromethoxytolan Compound No. 84 4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)-4'-trifluoromethoxytolan Compound No. 85 4-(trans-4-(3-butenyl)cyclohexyl)carbonyloxy-4'-methyltolan Compound No. 86 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-4'-methyltolan Compound No. 87 4-(trans-4-(3-butenyl)cyclohexyl)carbonyloxy-4'-propyltolan Compound No. 88 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-4'-propyltolan Compound No. 89 4-(trans-4-(3-butenyl)cyclohexyl)carbonyloxy-2,6-difluoro-4'-methyltolan Compound No. 90 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-2,6-difluoro-4'-methyltolan Compound No. 91 4-(trans-4-(3-butenyl)cyclohexyl)carbonyloxy-2,6-difluoro-4'-propyltolan Compound No. 92 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-2,6-difluoro-4'-propyltolan Compound No. 93 4-(trans-4-(3-butenyl)cyclohexyl)carbonyloxy-4'-ethoxytolan Compound No. 94 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-4'-ethoxytolan Compound No. 95 4-(trans-4-(3-butenyl)cyclohexyl)carbonyloxy-4'-cyanotolan Compound No. 96 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-4'-cyanotolan Compound No. 97 4-(trans-4-(3-butenyl)cylohexyl)carbonyloxy-3'-fluoro-4'-cyanotolan Compound No. 98 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-3'-fluoro-4'-cyanotolan Compound No. 99 4-(trans-4-(3-butenyl)cyclohexyl)carbonyloxy-4'-chlorotolan Compound No. 100 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-4'-chlorotolan Compound No. 101 4-(trans-4-(3-butenyl)cyclohexyl)carbonyloxy-3'-fluoro-4'-chlorotolan Compound No. 102 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-3'-fluoro-4'-chlorotolan Compound No. 103 4-(trans-4-(3-butenyl) cyclohexyl)carbonyloxy-4'-trifluoromethyltolan Compound No. 104 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-4'-trifluoromethyltolan Compound No. 105 4-(trans-4-(3-butenyl)cyclohexyl)carbonyloxy-4'-trifluoromethoxytolan Compound No. 106 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-4'-trifluoromethoxytolan Compound No. 107 4-(trans-4-(3-butenyl)cyclohexyl)carbonyloxy-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 108 4-(trans-4-(3-E-pentenyl)cyclohexyl)carbonyloxy-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 109 trans-1-(4-(trans-4-(3-butenyl)cyclohexylcarbonyloxy)phenyl) ethynyl-4-ethylcyclohexane Compound No. 110 trans-1-(4-(trans-4-(3-E-pentenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-ethylcyclohexane Compound No. 111 trans-1-(4-(trans-4-(3-butenyl)cyclohexylcarbonyloxy)-2,6-difluorophenyl)ethynyl-4-ethylcyclohexane Compound No. 112 trans-1-(4-(trans-4-(3-E-pentenyl)cyclohexylcarbonyloxy)-2,6-difluorophenyl)ethynyl-4-ethylcyclohexane Compound No. 113 trans-1-(4-(trans-4-(3-butenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-ethoxycyclohexane Compound No. 114 trans-1-(4-(trans-4-(3-E-pentenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-ethoxycyclohexane Compound No. 115 trans-1-(4-(trans-4-(3-butenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-cyanocyclohexane Compound No. 116 trans-1-(4-(trans-4-(3-E-pentenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-cyanocyclohexane Compound No. 117 trans-1-(4-(trans-4-(3-butenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-chlorocyclohexane Compound No. 118 trans-1-(4-(trans-4-(3-E-pentenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-chlorocyclohexane Compound No. 119 trans-1-(4-(trans-4-(3-butenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-trifluoromethylcyclohexane Compound No. 120 trans-1-(4-(trans-4-(3-E-pentenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-trifluoromethylcyclohexane Compound No. 121 trans-1-(4-(trans-4-(3-butenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-trifluoromethoxycyclohexane Compound No. 122 trans-1-(4-(trans-4-(3-E-pentenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-trifluoromethoxycyclohexane Compound No. 123 trans-1-(4-(trans-4-(3-butenyl)cyclohexylcarbonyloxy)phenyl) ethynyl-4-(1-fluoro-2,2,2-trifluoroethyl)oxycyclohexane Compound No. 124 trans-1-(4-(trans-4-(3-E-pentenyl)cyclohexylcarbonyloxy) phenyl)ethynyl-4-(1-fluoro-2,2,2-trifluoroethyl)oxycyclohexane Compound No. 125 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-4'-methyltolan Compound No. 126 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-4'-methyltolan Compound No. 127 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-4'-propyltolan Compound No. 128 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-4'-propyltolan Compound No. 129 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-4'-butyltolan Compound No. 130 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl-4'-pentyltolan Compound No. 131 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-2,6-difluoro-4'-methyltolan Compound No. 132 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-2,6-difluoro-4'-methyltolan Compound No. 133 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-2,6-difluoro-4'-propyltolan Compound No. 134 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-2,6-difluoro-4'-propyltolan Compound No. 135 4-(trans-4-(trans-4-(2-propenyloxymethyl)cyclohexyl) cyclohexyl)-4'-ethyltolan Compound No. 136 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-4'-ethoxytolan Compound No. 137 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-4'-ethoxytolan Compound No. 138 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-4'-propoxytolan Compound No. 139 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-4'-propoxytolan Compound No. 140 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-4'-cyanotolan Compound No. 141 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-4'-cyanotolan Compound No. 142 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-3'-fluoro-4'-cyanotolan Compound No. 143 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-3'-fluoro-4'-cyanotolan Compound No. 144 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-4'-chlorotolan Compound No. 145 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-4'-chlorotolan Compound No. 146 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-3'-fluoro-4'-chlorotolan Compound No. 147 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-3'-fluoro-4'-chlorotolan Compound No. 148 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl))-4'-bromotolan Compound No. 149 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-4'-bromotolan Compound No. 150 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-4'-trifluoromethyltolan Compound No. 151 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-4'-trifluoromethyltolan Compound No. 152 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-4'-trifluoromethoxytolan Compound No. 153 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-4'-trifluoromethoxytolan Compound No. 154 4-(trans-4-(trans-4-(3-butenyl)cyclohexyl)cyclohexyl)-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 155 4-(trans-4-(trans-4-(3-E-pentenyl)cyclohexyl)cyclohexyl)-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 156 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-4'-methyltolan Compound No. 157 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-4'-methyltolan Compound No. 158 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-4'-propyltolan Compound No. 159 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-4'-propyltolan Compound No. 160 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-2,6-difluoro-4'-methyltolan Compound No. 161 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-2,6-difluoro-4'-methyltolan Compound No. 162 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-2,6-difluoro-4'-propyltolan Compound No. 163 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-2,6-difluoro-4'-propyltolan Compound No. 164 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-4'-ethoxytolan Compound No. 165 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-4'-ethoxytolan Compound No. 166 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-4'-propoxytolan Compound No. 167 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-4'-propoxytolan Compound No. 168 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-4'-cyanotolan Compound No. 169 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-4'-cyanotolan Compound No. 170 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-3'-fluoro-4'-cyanotolan Compound No. 171 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-3'-fluoro-4'-cyanotolan Compound No. 172 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-4'-chlorotolan Compound No. 173 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-4'-chlorotolan Compound No. 174 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-3'-fluoro-4'-chlorotolan Compound No. 175 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-3'-fluoro-4'-chlorotolan Compound No. 176 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-4'-bromotolan Compound No. 177 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-4'-bromotolan Compound No. 178 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-4'-trifluoromethyltolan Compound No. 179 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-4'-trifluoromethyltolan Compound No. 180 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-4'-trifluoromethoxytolan Compound No. 181 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-4'-trifluoromethoxytolan Compound No. 182 4-(trans-4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl) cyclohexyl)-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 183 4-(trans-4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl) cyclohexyl)-4'-(1-fluoro-2,2,2-trifluoraethyl)oxytolan Compound No. 184 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-4'-methyltolan Compound No. 185 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-4'-methyltolan Compound No. 186 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-4'-propyltolan Compound No. 187 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl phenyl) -4'-propyltolan Compound No. 188 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-2,6-difluoro-4'-methyltolan Compound No. 189 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-2,6-difluoro-4'-methyltolan Compound No. 190 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-2,6-difluoro-4'-propyltolan Compound No. 191 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-2,6-difluoro-4'-propyltolan Compound No. 192 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-4'-ethoxytolan Compound No. 193 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-4'-ethoxytolan Compound No.194 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-4'-propoxytolan Compound No. 195 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-4'-propoxytolan Compound No. 196 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-4'-cyanotolan Compound No. 197 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-4'-cyanotolan Compound No. 198 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-3'-fluoro-4'-cyanotolan Compound No. 199 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-3'-fluoro-4'-cyanotolan Compound No. 200 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-4'-chlorotolan Compound No. 201 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-4'-chlorotolan Compound No. 202 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-3'-fluoro-4'-chlorotolan Compound No. 203 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-3'-fluoro-4'-chlorotolan Compound No. 204 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-4'-bromotolan Compound No. 205 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-4'-bromotolan Compound No. 206 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-4'-trifluoromethyltolan Compound No. 207 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-4'-trifluoromethyltolan Compound No. 208 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-4'-trifluoromethoxytolan Compound No. 209 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-4'-trifluoromethoxytolan Compound No. 210 4-(4-(trans-4-(3-butenyl)cyclohexyl)phenyl)-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 211 4-(4-(trans-4-(3-E-pentenyl)cyclohexyl)phenyl)-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 212 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-4'-methyltolan Compound No. 213 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-4'-methyltolan Compound No. 214 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-4'-propyltolan Compound No. 215 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-4'-propyltolan Compound No. 216 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-2,6-difluoro-4'-methyltolan Compound No. 217 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-2,6-difluoro-4'-methyltolan Compound No. 218 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-2,6-difluoro-4'-propyltolan Compound No. 219 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-2,6-difluoro-4'-propyltolan Compound No. 220 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-4'-ethoxytolan Compound No. 221 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-2,6-difluoro-4'-ethoxytolan Compound No. 222 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-4'-propoxytolan Compound No. 223 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-2,6-difluoro-4'-propoxytolan Compound No. 224 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-4'-cyanotolan Compound No. 225 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-4'-cyanotolan Compound No. 226 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-3'-fluoro-4'-cyanotolan Compound No. 227 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-3'-fluoro-4'-cyanotolan Compound No. 228 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-4'-chlorotolan Compound No. 229 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-4'-chlorotolan Compound No. 230 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-3'-fluoro-4'-chlorotolan Compound No. 231 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-3'-fluoro-4'-chlorotolan Compound No. 232 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-4'-bromotolan Compound No. 233 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-4'-bromotolan Compound No. 234 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-4'-trifluoromethyltolan Compound No. 235 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-4'-trifluoromethyltolan Compound No. 236 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-4'-trifluoromethoxytolan Compound No. 237 4-(4-(2-(trans-4-(3-E-gentenyl)cyclohexyl)ethyl)phenyl)-4'-trifluoromethoxytolan Compound No. 238 4-(4-(2-(trans-4-(3-butenyl)cyclohexyl)ethyl)phenyl)-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 239 4-(4-(2-(trans-4-(3-E-pentenyl)cyclohexyl)ethyl)phenyl)-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 240 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-4'-methyltolan Compound No. 241 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-4'-methyltolan Compound No. 242 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-4'-propyltolan Compound No. 243 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-4'-propyltolan Compound No. 244 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-2,6-difluoro-4'-methyltolan Compound No. 245 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-2,6-difluoro-4'-methyltolan Compound No. 246 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-2,6-difluoro-4'-propyltolan Compound No. 247 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-2,6-difluoro-4'-propyltolan Compound No. 248 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-4'-ethoxytolan Compound No. 249 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-4'-ethoxytolan Compound No. 250 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-4'-propoxytolan Compound No. 251 4-(trans-4-(4-(3-E-pentenyl)phenyl) cyclohexyl)-4'-propoxytolan Compound No. 252 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl) -4'-cyanotolan Compound No. 253 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-4'-cyanotolan Compound No. 254 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-3'-fluoro-4'-cyanotolan Compound No. 255 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-3'-fluoro-4'-cyanotolan Compound No. 256 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-4'-chlorotolan Compound No. 257 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-4'-chlorotolan Compound No. 258 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-3'-fluoro-4'-chlorotolan Compound No. 259 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-3'-fluoro-4'-chlorotolan Compound No. 260 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-4'-bromotolan Compound No. 261 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-4'-bromotolan Compound No. 262 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-4'-trifluoromethyltolan Compound No. 263 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-4'-trifluoromethyltolan Compound No. 264 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-4'-trifluoromethoxytolan Compound No. 265 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-4'-trifluoromethoxytolan Compound No. 266 4-(trans-4-(4-(3-butenyl)phenyl)cyclohexyl)-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 267 4-(trans-4-(4-(3-E-pentenyl)phenyl)cyclohexyl)-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 268 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-4'-methyltolan Compound No. 269 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-4'-methyltolan Compound No. 270 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-4'-propyltolan Compound No. 271 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-4'-propyltolan Compound No. 272 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-2,6-difluoro-4'-methyltolan Compound No. 273 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-2,6-difluoro-4'-methyltolan Compound No. 274 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-2,6-difluoro-4'-propyltolan Compound No. 275 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-2,6-difluoro-4'-propyltolan Compound No. 276 4-(4-(4-(3-butenyl)-2,6-difluorophenylethynyl)phenyl)-4'-methyltolan Compound No. 277 4-(4-(4-(3-E-pentenyl)-2,6-difluorophenylethynyl)phenyl)-4'-methyltolan Compound No. 278 4-(4-(4-(3-butenyl)-2,6-difluorophenylethynyl)phenyl)-4'-propyltolan Compound No. 279 4-(4-(4-(3-E-pentenyl)-2,6-difluorophenylethynyl)phenyl)-4'-propyltolan Compound No. 280 4-(4-(4-(3-butenyl)-2,6-difluorophenylethynyl)phenyl)-2,6-difluoro-4'-methyltolan Compound No. 281 4-(4-(4-(3-E-pentenyl)-2,6-difluorophenylethynyl)phenyl)-2,6-difluoro-4'-methyltolan Compound No. 282 4-(4-(4-(3-butenyl)-2,6-difluorophenylethynyl)phenyl)-2,6-difluoro-4'-propyltolan Compound No. 283 4-(4-(4-(3-E-pentenyl)-2,6-difluorophenylethynyl)phenyl)-2,6-difluoro-4'-propyltolan Compound No. 284 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-4'-ethoxytolan Compound No. 285 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-4'-ethoxytolan Compound No. 286 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-4'-propoxytolan Compound No. 287 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-4'-propoxytolan Compound No. 288 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-4'-cyanotolan Compound No. 289 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-4'-cyanotolan Compound No. 290 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-3'-fluoro-4'-cyanotolan Compound No. 291 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-3'-fluoro-4'-cyanotolan Compound No. 292 4-(4-(4-(3-butehyl)phenylethynyl)phenyl)-4'-chlorotolan Compound No. 293 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-4'-chlorotolan Compound No. 294 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-3'-fluoro-4'-chlorotolan Compound No. 295 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-3'-fluoro-4'-chlorotolan Compound No. 296 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-4'-bromotolan Compound No. 297 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-4'-bromotolan Compound No. 298 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-4'-trifluoromethyltolan Compound No. 299 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-4'-trifluoromethyltolan Compound No. 300 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-4'-trifluoromethoxytolan Compound No. 301 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-4'-trifluoromethoxytolan Compound No. 302 4-(4-(4-(3-butenyl)phenylethynyl)phenyl)-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Compound No. 303 4-(4-(4-(3-E-pentenyl)phenylethynyl)phenyl)-4'-(1-fluoro-2,2,2-trifluoroethyl)oxytolan Example 8 (Use Example 1) Nematic liquid crystal of a liquid crystal composition comprising 4-(trans-4-propylcyclohexyl)benzonitrile 24% (% by weight, the same will be applied in the followings) 4-(trans-4-pentylcyclohexyl)benzonitrile 36 % 4-(trans-4-heptylcyclohexyl)benzonitrile 25 %, and 4-(4-propylphenyl)benzonitrile 15 % had a clearing point (TNI) of 71.7°C. When this liquid crystal composition was filled in a TN cell (twisted nematic cell) having a thickness of 9 µm, its operation threshold voltage was 1.78 V, value of dielectric anisotropy (Δε) was +11.0, value of optical anisotropy (Δn) was 0.137, and viscosity at 20°C (η20) was 27.2 mPa.s. Assuming this liquid crystal composition as mother liquid crystal (hereinafter referred to as Mother liquid crystal A), 15 % of the 4-(trans-4-(3-butenyl)cyclohexyl)-4'-ethyltolan (Compound No. 18) described in Example 1 was mixed with 85 % of Mother liquid crystal A, and physical properties of the mixture were determined. As the result, it was found that TNI was 88.3°C, Vth was 1.89 V, Δε was 10.4, Δn was 0.155, and η20 was 25.2 mPa.s. Whereas this liquid crystal composition was left in a freezer at -20°C for 20 days, neither precipitation of crystals nor development of smectic phase was observed. In the same manner, the following liquid crystal compositions were prepared and their physical properties were determined. (In the followings, the meaning of abbreviation is the same as described above. Also, in the following, η20 is abbreviated as η.) Example 9 (Use Example 2) V2-BTB-5 5.0 % V2-HBTB-2 3.0 % 3-GB-C 10.0 % 4-GB-C 10.0 % 2-BEB-C 12.0 % 3-BEB-C 4.0 % 3-PyB(F)-F 6.0 % 3-HEB-O4 8.0 % 4-HEB-O2 6.0 % 5-HEB-O1 6.0 % 3-HEB-O2 5.0 % 5-HEB-O2 4.0 % 5-HEB-5 5.0 % 1O-BEB-2 4.0 % 3-HHB-1 3.0 % 3-HHEBB-C 3.0 % 3-HBEBB-C 3.0 % 5-HBEBB-C 3.0 % TNI = 70.6 (°C) η = 38.4 -mPa.s) Δn = 0.135 Δε = 11.8 Vth = 1.19 (V) Example 10 (Use Example 3) V2-HBTB-2 4.0 % V2-HB(F,F)TB-2 4.0 % 2O1-BEB(F)-C 5.0 % 3O1-BEB(F)-C 12.0 % 5O1-BEB(F)-C 4.0 % 1V2-BEB(F,F)-C 10.0 % 3-HH-EMe 10.0 % 3-HB-O2 18.0 % 7-HEB-F 2.0 % 3-HHEB-F 2.0 % 5-HHEB-F 2.0 % 3-HBEB-F 4.0 % 2O1-HBEB(F)-C 2.0 % 3-HB(F)EB(F)-C 2.0 % 3-HBEB(F,F)-C 2.0 % 3-HHB-F 4.0 % 3-HHB-O1 4.0 % 3-HHB-3 5.0 % 3-HEBEB-F 2.0 % 3-HEBEB-1 TNI = 78.1 (°C) η = 35.7 (mPa.s) Δn = 0.127 Δε = 24.0 Vth = 0.82 Example 11 (Use Example 4) V2-BTB-5 5.0 % V2-HBTB-2 7.0 % 2-HHB(F)-F 17.0 % 3-HHB(F)-F 17.0 % 5-HHB(F)-F 16.0 % 2-H2HB(F)-F 10.0 % 5-H2HB(F)-F 10.0 % 2-HBB(F)-F 6.0 % 3-HBB(F)-F 6.0 % 5-HBB(F)-F 6.0 % TNI = 103.9 (°C) η = 22.6 (mPa.s) Δn = 0.112 Δε = 5.0 Vth = 2.27 (V) Example 12 (Use Example 5) V2-HBTB-2 5.0 % V2-HB(F,F)TB-2 5.0 % 2-HHB(F)-F 2.0 % 3-HHB(F)-F 2.0 % 5-HHB(F)-F 2.0 % 2-HBB(F)-F 6.0 % 3-HBB(F)-F 6.0 % 2-H2BB(F)-F 9.0 % 3-H2BB(F)-F 9.0 % 3-HBB(F,F)-F 25.0 % 5-HBB(F,F)-F 19.0 % 1O1-HBBH-4 5.0 % 1O1-HBBH-5 5.0 % TNI = 103.4 (°C) η = 34.4 (mPa.s) Δn = 0.147 Δε = 7.1 Vth = 2.09 (V) Example 13 (Use Example 6) V2-BTB-5 5.0 % V2-HBTB-2 5.0 % V2-HB(F,F)TB-2 5.0 % 3-H2HB(F,F)-F 7.0 % 5-H2HB(F,F)-F 8.0 % 3-HHB(F,F)-F 10.0 % 4-HHB(F,F)-F 5.0 % 3-HH2B(F,F)-F 9.0 % 5-HH2B(F,F)-F 9.0 % 5-HHB(F,F)-F 15.0 % 3-HBEB(F,F)-F 2.0 % 4-HBEB(F,F)-F 2.0 % 5-HBEB(F,F)-F 2.0 % 3-HH2B(F,F)-F 10.0 % 4-HHEB(F,F)-F 3.0 % 5-HHEB(F,F)-F 3.0 % TNI = 92.5 (°C) η = 28.2 (mPa.s) Δn = 0.111 Δε = 10.5 Vth = 2.21 (V) Comparative Example 1 As a compound to be compared to the compounds of the present invention, the compound (23) described in Mol. Cryst. Liq. Cryst., vol. 141, p 279 (1986) was actually synthesized, and assumed to be comparative compound. Liquid crystal composition in which 85 % of Mother liquid crystal A described above and 15 % of the comparative compound (23) were mixed was prepared, and its optical anisotropy (Δn; extrapolation value) was determined. Its result, and phase transition temperatures and miscibility of the compound are shown in Table 2 together with the results of Example 8 [compound of general formula (1-c) - inventive compound 18 = (24)] As shown in Table 2, whereas the comparative compound (23) had a transition temperature from crystal to liquid crystal phase of 102°C, compound (24) had a phase transition temperature of 58.9°C, respectively. With respect to the temperature range of liquid crystal phase, whereas the range of the compound (23) was 95°C, that of compounds (24) was 116°C, respectively. As will be seen from these results, the compound of the present invention is remarkably low in the lower temperature limit for exhibiting liquid crystal phase and wide in the temperature range compared with conventional liquid crystalline compounds. Accordingly, liquid crystal compositions comprising the compound of the present invention can be considered to have wide range of liquid crystal display in practical use. As shown in Table 2, the value of optical anisotropy of the compound of the present invention was also higher than that of conventional liquid crystalline compounds. Accordingly, it is possible to reduce the thickness of liquid crystal cells and increase the response speed in cells by using liquid crystal compositions comprising the compound of the present invention. Besides, whereas solids exhibiting smectic phase were precipitated in 7 days when the compound (23) was left in a freezer at -20°C, precipitation of crystals or the likes was not caused in 20 days or more with respect to the compound (24) of the present invention to confirm that the compounds of the present invention have remarkably excellent miscibility at low temperatures. As described above, the compound of the present invention has characteristics which can not be found in known liquid crystal compounds, and has excellent properties as liquid crystal material. INDUSTRIAL APPLICABILITY As described above, according to the present invention, (a) tolan derivatives, novel liquid crystalline compounds having sufficiently high optical anisotropy, high dielectric anisotropy, large ratio of elastic constants, excellent miscibility with other liquid crystalline compounds, low viscosity, and chemical and physical stability; (b) liquid crystal compositions comprising the tolan derivative; and (c) liquid crystal display devices including the liquid crystal composition can be provided.

Claims: A liquid crystalline alkenyltolan derivative expressed by the general formulas (1-b) to (1-9), (1-k) and (1-n) to (1-s) The liquid crystalline alkenyltolan derivative according to claim 1 wherein G represents a covalent bond, t + m = 4, and a double bond exists at a terminal of the molecule. The liquid crystalline alkenyltolan derivative according to claim 1 wherein G represents a covalent bond, t + m = 5, and a double bond exists at a second position counting from a terminal of the molecule. wherein G represents a covalent bond or an oxygen atom; C t H 2t-1 represents an alkenyl group having t carbon atoms wherein t is an integer of 2 to 10; m is an integer of 0 to 2; X represents an alkyl group having 1 to 10 carbon atoms, a fluoroalkyl group having 1 to 10 carbon atoms, a chlorine atom, a bromine atom, or a cyano group wherein one or more methylene groups or fluoromethylene groups in the alkyl group or the fluoroalkyl group may be replaced by an oxygen atom(s) or an 1,2-ethenylene group, but adjacent two methylene groups should not be simultaneously replaced by them; wherein in formulas (1-b), (1-d) , (1-e), (1-g) , (1-k) , (1-n) to (1-s), 1,4-phenylene having F in parenthesis represents 1,4-phenylene in which one or two hydrogen atoms may be replaced by a fluorine atom(s). A liquid crystal composition comprising at least two components and comprising at least one liquid crystalline compound defined in any one of claims 1 to 3. A liquid crystal composition comprising, as a first component, at least one liquid crystalline compound defined in any one of claims 1 to 3, and comprising, as a second component, at least one compound selected from the group consisting of the compounds expressed by any one of the general formulas (2), (3), and (4) wherein R 1 represents an alkyl group or alkyloxy group having 1 to 10 carbon atoms; Y represents a fluorine atom or a chlorine atom; Q 1 and Q 2 independently represent a hydrogen atom or a fluorine atom; r is 1 or 2; and Z 1 and Z 2 independently represent a covalent bond or -CH 2 CH 2 -. A liquid crystal composition comprising, as a first component, at least one compound defined. in any one of claims 1 to 3, and comprising, as a second component, at least one compound selected from the group consisting of the compounds expressed by any one of the general formulas (5), (6), (7), (8), and (9) R 5 -(H)-Z 5 -(J)-R 6 wherein R 2 represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and any methylene group (-CH 2 -) in the alkyl or the alkenyl group may be replaced by an oxygen atom (-O-), but adjacent two or more methylene groups are not replaced by an oxygen atom(s) simultaneously; Z 3 represents a covalent bond, -CH 2 CH 2 -, or -COO-; Q 3 and Q 4 independently represent a hydrogen atom or a fluorine atom; (E) represents an 1,4-cyclohexylene, 1,4-phenylene, or dioxane-2,5-diyl group; s is 0 or 1; R 3 represents an alkyl group having 1 to 10 carbon atoms; Q 5 represents a hydrogen atom or a fluorine atom; k is 0 or 1; R 4 represents an alkyl group having 1 to 10 carbon atoms; (G 1 ) represents an 1,4-cyclohexylene or 1,4-phenylene group; Q 6 and Q 7 independently represent a hydrogen atom or a fluorine atom; Z 4 represents a covalent bond or -COO-; h is 0 or 1; R 5 and R 6 independently represent an alkyl group, alkyloxy group, or alkyloxymethyl group, each having 1 to 10 carbon atoms; (H) represents an 1,4-cyclohexylene, pyrimidine-2,5-diyl, or 1,4-phenylene group; (J) represents an 1,4-cyclohexylene or 1,4-phenylene group; Z 5 represents a covalent bond, -CH 2 CH 2 -, -C≡C-, or -COO-; R 7 represents an alkyl group or alkyloxy group, each having 1 to 10 carbon atoms; R 8 represents an alkyl group, alkyloxy group, or alkyloxymethyl group, each having 1 to 10 carbon atoms; (K) represents an 1,4-cyclohexylene or pyrimidine-2,5-diyl group; (L) and (M) independently represent an 1,4-cyclohexylene or 1,4-phenylene group; Z 6 represents a covalent bond, -CH 2 CH 2 -, or -COO-; Z 7 represents a covalent bond, -C≡C-, or -COO-; and Q 8 represents a hydrogen atom or a fluorine atom. A liquid crystal display device including a liquid crystal composition comprising at least 2 components and comprising at least one liquid crystalline compound defined in any one of claims 1 to 3. A liquid crystal display device including a liquid crystal composition defined in any one of claims 4 to 7.

Inventors: FUJITA ATSUKO, HACHIYA NORIHISA, MATSUI SHUICHI, MIYAZAWA KATZUTOSHI, NAKAGAWA ETSUO, TAMURA NORIO, FUJITA, ATSUKO, HACHIYA, NORIHISA, MATSUI, SHUICHI, MIYAZAWA, KATZUTOSHI, NAKAGAWA, ETSUO, TAMURA, NORIO
Applicants: CHISSO CORP, CHISSO CORPORATION
Application year: 1997
Main classification: C07C13
IPC codes: C07C255, C09K19, C07C69, C07D239