Source: http://www.google.com/patents/US4441913?ie=ISO-8859-1
Timestamp: 2015-04-19 16:16:10
Document Index: 587968030

Matched Legal Cases: ['Application No. 51', 'Application No. 52', 'Application No. 52', 'Application No. 54', 'Application No. 51', 'Application No. 52', 'Application No. 52', 'Application No. 54']

Patent US4441913 - Substituted phenoxypropionates and herbicidal compositions - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsNovel substituted phenoxypropionates of the formula ##STR1## in which R1 and R2 each independently are a hydrogen atom or a C1 to C6 alkyl group, X is a hydrogen or halogen atom, nitro, C1 to C6 alkyl or C1 to C6 alkoxy, a and n each independently are 1 or 2, and Ar is a group of the formula ##STR2##...http://www.google.com/patents/US4441913?utm_source=gb-gplus-sharePatent US4441913 - Substituted phenoxypropionates and herbicidal compositionsAdvanced Patent SearchPublication numberUS4441913 APublication typeGrantApplication numberUS 06/389,525Publication dateApr 10, 1984Filing dateJun 17, 1982Priority dateJun 25, 1981Fee statusLapsedAlso published asCA1175839A1, DE3269600D1, EP0068260A2, EP0068260A3, EP0068260B1, US4584396Publication number06389525, 389525, US 4441913 A, US 4441913A, US-A-4441913, US4441913 A, US4441913AInventorsMasahiro Aya, Junichi Saito, Kazuomi Yasui, Kozo Shiokawa, Koichi MoriyaOriginal AssigneeNihon Tokushu Noyaku Seizo K.K.Export CitationBiBTeX, EndNote, RefManPatent Citations (2), Referenced by (9), Classifications (14), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetSubstituted phenoxypropionates and herbicidal compositions
US 4441913 AAbstract
Novel substituted phenoxypropionates of the formula ##STR1## in which R1 and R2 each independently are a hydrogen atom or a C1 to C6 alkyl group,
X is a hydrogen or halogen atom, nitro, C1 to C6 alkyl or C1 to C6 alkoxy,
a and n each independently are 1 or 2, and
Ar is a group of the formula ##STR2## wherein Y is a trifluoromethyl group, a halogen atom or
a nitro, cyano or C1 to C6 alkyl group, and
and their use as herbicides.
Novel intermediates of the formulae ##STR3## in which formulae R1, R2, X, a and n have the meanings given above and
Z1 represents halogen.
1. A substituted phenoxypropionate of the formula ##STR94## in which R1 and R2 each independently is a hydrogen atom or a C1 to C6 alkyl group,X is a hydrogen or halogen atom, a nitro, C1 to C6 alkyl or C1 to C6 alkoxy group, a and n each independently is 1 or 2, Y is a trifluoromethyl group, a halogen atom or a nitro, cyano or C1 to C6 alkyl group, and b is 1 or 2. 2. Compound as claimed in claim 1 wherein R1 is hydrogen.
3. Compound as claimed in claim 1 wherein R1 is a C1 to C6 alkyl group.
4. Compound as claimed in claim 1 wherein R2 is hydrogen.
5. Compound as claimed in claim 1 wherein R2 is a C1 to C6 alkyl group.
6. Compound as claimed in claim 1 wherein X is hydrogen, halogen, nitro, C1 to C4 alkyl or C1 to C4 alkoxy.
7. Compound as claimed in claim 1, wherein R1 and R2 each independently is hydrogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl or tert-butyl, X is a hydrogen atom, a fluorine, chlorine, bromine or iodine atom, a nitro, methyl, methoxy, ethyl, ethoxy, n-propyl, n-propoxyl, isopropyl, isopropoxy or n-, iso-, sec- or tert-butyl or -butoxy group, a and n each independently is 1 or 2, Y is a trifluoromethyl group, a fluorine, chlorine, bromine or iodine atom or a nitro, cyano, methyl, ethyl, propyl, isopropyl, n-, iso-, sec- or tert-butyl group and b is 1, 2 or 3.
8. Compound as claimed in claim 1, designated 2-(2-fluorobenzyloxy)ethyl 2-(4-(3,5-dichloropyridyloxy)phenoxy)-propionate of the formula ##STR95##
9. Compound as claimed in claim 1, designated 2-benzyloxyethyl 2-(4-(3,5-dichloropyridyloxy)-phenoxy)-propionate of the formula ##STR96##
10. Compound as claimed in claim 1, designated 1-methyl-2-benzyloxyethyl 2-(4-(3,5-dichloropyridyloxy)-phenoxy)-propionate of the formula ##STR97##
11. Compound as claimed in claim 1, designated 2-(4-chlorobenzyloxy)ethyl 2-(4-(3,5-dichloropyridyloxy)-phenoxy)-propionate of the formula ##STR98##
12. Compound as claimed in claim 1, designated 2-benzyloxyethyl 2-(4-(5-trifluoromethylpyridyloxy)phenoxy)propionate of the formula ##STR99##
13. Compound as claimed in claim 1, designated 2-(2-fluorobenzyloxy)ethyl 2-(4-(5-trifluoromethyl pyridyloxy)phenoxy)propionate of the formula ##STR100##
14. Compound as claimed in claim 1, designated 2-(4-chlorobenzyloxy)ethyl 2-(4-(5-trifluoromethyl pyridyloxy)phenoxy)propionate of the formula ##STR101##
15. Compound as claimed in claim 1, designated 3-benzyloxypropyl 2-(4-(5-trifluoromethylpyridyloxy)phenoxy)propionate of the formula ##STR102##
16. A herbicidal composition comprising an agriculturally acceptable carrier and, in herbicidally effective amount, a substituted phenoxypropionate as claimed in claim 1.
17. A herbicidal composition as claimed in claim 16 containing from 0.01 to 95% of the active compound, by weight.
18. A method of combating weeds which comprises applying to the weeds, or their habitat, a herbicidally effective amount of a substituted phenoxypropionate according to claim 1.
19. A method as claimed in claim 18, wherein said compound is applied at a dosage of 0.01 to 2 kg per hectare.
20. A method as claimed in claim 19, wherein said compound is applied at a dosage of 0.05 to 1 kg per hectare.
21. A method as claimed in claim 18, wherein said substituted phenoxypropionate compound is selected from2-(2-fluorobenzyloxy)ethyl 2-(4-(3,5-dichloropyridyloxy)phenoxy)-propionate, 2-benzyloxyethyl 2-(4-(3,5-dichloropyridyloxy)phenoxy)-propionate, 1-methyl-2-benzyloxyethyl 2-(4-(3,5-dichloropyridyloxy)phenoxy)-propionate, 2-(4-chlorobenzyloxy)ethyl 2-(4-(3,5-dichloropyridyloxy)phenoxy)-propionate, 2-benzyloxyethyl 2-(4-(5-trifluoromethylpyridyloxy)phenoxy)-propionate, 2-(2-fluorobenzyloxy)ethyl 2-(4-(5-trifluoromethylpyridyloxy)phenoxy)-propionate, 2-(4-chlorobenzyloxy)ethyl 2-(4-(5-trifluoromethylpyridyloxy)phenoxy)propionate, and 3-benzyloxypropyl 2-(4-(5-trifluoromethylpyridyloxy)phenoxy)propionate. Description
The present invention relates to certain novel substituted phenoxypropionates, to herbicidal compositions containing them and to methods of combating weeds utilizing such compounds.
The present invention also relates to novel intermediates for the preparation of said substituted phenoxypropionates.
It has been disclosed in U.S. Pat. No. 4,046,553 corresponding to Japanese Laid-Open Patent Application No. 51-106,735 that herbicidal activity is possessed by compounds of the general formula ##STR4## wherein X1 and X2 each represents halogen,
Y represents hydrogen or alkyl having 6 or less carbon atoms, and
Z represents oxygen or sulfur,
and the salts, esters, amides, and halides thereof.
It has been disclosed in Japanese Laid-open Patent Application No. 52-131,545 corresponding to DE-OS (German published specification) No. 2,617,804 that herbicidal activity is possessed by compounds of the general formula ##STR5## wherein R represents hydrogen or halogen,
(a) straight- or branched chain (C1 -C12)alkyl (which is substituted by cyclohexyl, halophenyl, nitrophenyl, (C1 -C6)alkylphenyl, phenoxy (which is mono- to tri-substituted in some cases with halogen and/or (C1 -C4)alkyl), (C5 -C6)alkoxy, (C5 -C6)-alkoxy-(C2 -C4)alkoxy, (C1 -C4)alkoxyethoxyethoxy, (C1 -C4)acyl, a group represented by the general formula ##STR6## or, in the 2 position or a position remote from the carboxyl, mono- or poly-substituted by phenyl);
(b) cyclohexenyl or phenyl-(C3 -C4)alkenyl;
(c) (C3 -C4)alkynyl (which is optionally mono- or di-substituted by straight or branched chain (C1 -C4)alkyl, halogen, phenyl, halophenyl or (C1 -C4)alkylphenyl), provided that R1 does not represent unsubstituted propargyl or butynyl;
(d) one of the groups represented by the following general formulae: ##STR7## or (e) (C1 -C2)alkyl substituted by furyl, tetrahydrofuryl, pyridyl or oxiranyl,
R2 represents hydrogen, (C1 -C4)alkyl or (C1 -C4)alkoxy,
R3 represents hydrogen, (C1 -C4)alkyl or phenyl, or
R2 and R3 together form 4- or 5-membered, saturated or unsaturated alkylene chain one methylene of which may optionally be replaced by --O--, ##STR8## or --N--(C1 -C4)--alkyl, R4 represents hydrogen or (C1 -C4)alkyl,
Z represents an inorganic or organic anion,
R1 ' represents straight or branched chain (C1 -C12)alkylene,
R5 represents hydrogen, (C1 -C4)alkyl, (C1 -C4)haloalkyl, phenyl optionally substituted by halogen, nitro and/or (C1 -C4)alkyl, or group represented by the formula ##STR9## R6 represents (C1 -C4)alkyl, and n is 0, 1 or 2.
It has been disclosed in Japanese Laid-open Patent Application No. 52-144,637 corresponding to DE-OS (German published specification) No. 2,623,558 that herbicidal activity is possessed by compounds of the general formula ##STR10## wherein each R represents the same or different group selected from halogen, (C1 -C4)alkyl, and (C1 -C4)alkoxy,
(a) straight or branched chain (C1 -C12)alkyl (which is substituted by cyclohexyl, halophenyl, nitrophenyl, (C1 -C4)alkylphenyl, or a group represented by the general formula ##STR11## or mono- or poly-substituted by the same or different group selected from hydroxy, halogen, rhodanide, and phenyl, in 2- or more distant position from Y);
(b) mono- or di-(C1 -C4)alkylcyclohexyl;
(c) cyclohexenyl or (C3 -C4)alkenyl (which may be substituted by halogen, hydroxy, phenyl, halophenyl or (C1 -C4)alkylphenyl);
(d) naphthyl or phenyl (which is in some cases mono- or poly-substituted by (C1 -C4)alkyl, (C1 -C3)haloalkyl, CF3, NO2, CN, SCN, CHO, (C1 -C3)alkoxy, (C1 -C3)alkoxycarbonyl, aminocarbonyl, di-(C1 -C4)alkylamino, or (C1 -C2)alkylthio, and which may further contain halogen), or
when Y is O, R1 also represents:
(e) straight or branched chain (C3 -C6)alkynyl (which is in some cases mono- or poly-substituted by (C1 -C4)alkyl, (C1 -C4)alkoxy, halogen, phenyl, halophenyl, or (C1 -C4)alkylphenyl);
(f) halocyclohexyl optionally substituted by (C1 -C4)alkyl;
(g) group represented by the formula of ##STR12## (h) (C1 -C2)alkyl substituted by a furyl, tetrahydrofuryl, pyridyl or by oxiranyl;
(i) (C2 -C4)alkyl substituted by 3 to 7 chlorine and/or fluorine, or,
when Y is S, R1 represents:
(k) (C3 -C4)alkenyl,
R2 represents hydrogen, (C1 -C4)alkyl, (C1 -C4)alkoxy, hydroxyethyl or chloroethyl,
R3 represents hydrogen, (C1 -C4)alkyl, chloroethyl, phenyl, halophenyl, (C1 -C4)alkylphenyl, hydroxyethyl or aliphatic (C1 -C4)acyl, or, when taken together,
R2 and R3 represents 2-, 4- or 5-membered, saturated or unsaturated hydrocarbon chain one, carbon atom of which may be replaced by --O--, --CO--, --N--, --NH-- or --N--(C1 -C4)alkyl,
R4 represents hydrogen or (C1 -C4)alkyl,
Z represents an inorganic or organic acid anion, R1 ' represents a straight chain or branched chain (C1 -C12)alkylene,
R5 represents (C1 -C6)alkyl, (C1 -C4)haloalkyl, (C2 -C8)alkoxyalkyl, (C3 -C12)alkoxyalkoxy, hydroxyethyl or phenyl optionally mono- or di-substituted by halogen and/or (C1 -C3)alkyl,
R6 represents hydrogen, (C1 -C4)alkyl, (C1 -C4)haloalkyl, phenyl optionally substituted by halogen, nitro and/or (C1 -C4)alkyl, or a group of the general formula ##STR13## R7 represents (C1 -C4)alkyl, phenyl, halophenyl, nitrophenyl or (C1 -C4)alkylphenyl,
R8 represents hydrogen, (C1 -C4)alkyl or (C1 -C4)alkoxy,
R9 represents (C1 -C4)alkyl, and
It has further been disclosed in DE-OS (German published specification) No. 2,812,571, corresponding to Japanese Laid-open Patent Application No. 54-119,476, that herbicidal activity is possessed by compounds of the general formula ##STR14## wherein X represents fluorine or chlorine,
Y represents hydrogen or chlorine,
R represents hydrogen, methyl or ethyl,
n is 0 or 2,
Z1 represents hydroxy, (C1 -C6)alkoxy whose alkyl moiety is optionally substituted by 1 to 3 halogen, (C1 -C4)alkoxy-(C1 -C4)alkoxy, (C2 -C4)alkenyloxy, (C2 -C4)alkynyloxy, (C3 -C6)cycloalkyl whose cycloalkyl moiety is optionally substituted by (C1 -C4)alkyl, (C1 -C4)alkoxycarbonyl-(C1 -C4)alkoxy, phenoxy whose phenyl moiety is optionally substituted by 1 to 3 halogen or (C1 -C4)alkyl, benzyloxy, glycidyloxy, (C1 -C4)alkylthio, (C2 -C4)alkenylthio, phenylthio whose phenyl moiety is optionally substituted by 1 to 3 halogen or (C1 -C4)alkyl, amino, (C1 -C4)-alkylamino, (C1 -C4)alkoxycarbonylmethylamino, hydroxycarbonylmethylamino, anilino group whose phenyl moiety may optionally be substituted by 1 to 3 halogen, pyridin-2-ylamino, an --O-- cation, or halogen.
The present invention now provides, as new compounds, the substituted phenoxypropionates of the general formula ##STR15## in which R1 and R2 each independently represent a hydrogen atom or a C1 to C6 alkyl group,
X represents a hydrogen or halogen atom or a nitro, C1 to C6 alkyl or C1 to C6 alkoxy group,
Ar represents a group of the general formula ##STR16## wherein Y represents a trifluoromethyl group, a halogen atom or a nitro, cyano or C1 to C6 alkyl group, and
b is 1, 2 or 3.
The invention also provides a process for the preparation of a substituted phenoxypropionate of the formula (I), in which process
(a) a compound of the general formula ##STR17## in which Ar has the meaning given above, and
M represents a hydrogen atom or an alkali metal atom,
is reacted with a compound of the general formula ##STR18## in which R1, R2, X, a and n have the meanings given above, and
Z1 represents a halogen atom, or
(b) a compound of the general formula ##STR19## in which Ar has the meaning given above, and
Z2 represents a hydroxyl group or a halogen atom, is reacted with a compound of the general formula ##STR20## in which R1, R2, X, a and n have the meanings given above, or
(c) a compound of the general formula
Ar--Z1                                                (VI)
in which Ar and Z1 have the meanings given above, is reacted with a compound of the general formula ##STR21## in which R1, R2, X, M, a and n have the meanings given above.
Surprisingly the substituted phenoxypropionate compounds of the present invention, which have not previously been described in the literature, can be synthesized with ease in high yield, and are novel active compounds showing selective excellent herbicidal activity against gramineous weeds without causing substantial phytotoxicity on agricultural crops. It is particularly surprising that the compounds of the present invention show excellent properties which are not shown by structurally similar prior art compounds, in particular that, coupled with good toleration by useful plants, they show sufficient herbicidal activity in low amounts, and that they control regeneration of weeds, especially perennial gramineous weeds, over a long period of time due to their excellent lasting effect.
Preferred compounds according to the present invention, and corresponding starting materials are those in which Ar represents a group of formula (Ia) or (Ib), in which
Y represents a trifluoromethyl group, a fluorine, chlorine, bromine or iodine atom or a nitro, cyano, methyl, ethyl, propyl, isopropyl, n-, iso-, sec- or tert-butyl group,
R1 and R2 each independently represent a hydrogen atom or a methyl, ethyl, n-propyl, isopropyl, n-, iso-, sec- or tert-butyl group,
X represents a hydrogen atom, a fluorine, chlorine, bromine or iodine atom, a nitro, methyl, methoxy, ethyl, ethoxy, n-propyl, n-propoxyl, isopropyl, isopropoxy or n-, iso-, sec- or tert-butyl or -butoxy group, and
a and n are each independently 1 or 2.
If 4-(4-trifluoromethylphenoxy)phenol and 2-benzyloxyethyl 2-bromo propionate are used as starting materials, the course of reaction variant (a) according to the present invention is illustrated by the following equation: ##STR22##
If 2-[4-(3,5-dichloro-2-pyridyloxy)phenoxy]propionyl chloride and 1-benzyloxy-2-propanol are used as starting materials, the course of reaction variant (b) according to the present invention is illustrated by the following equation: ##STR23##
If 4-trifluoromethylphenylchloride and 2-(2-fluorobenzyloxy)ethyl-2-(4-hydroxyphenoxy)propionate are used as starting materials, the course of reaction variant (c) according to the present invention is illustrated by the following equation: ##STR24##
Examples of the compounds of the formula (II) used as starting materials in reaction variant (a) according to the present invention are
4-(4-trifluoromethylphenoxy)phenol, 4-(2-trifluoromethylphenoxy)phenol, 4-(4-fluorophenoxy)phenol, 4-(2,4-dichlorophenoxy)phenol, 4-(2-chloro-4-nitrophenoxy)phenol, 4-(2-trifluoromethyl-4-chlorophenoxy)phenol, 4-(4-trifluoromethyl-2-chlorophenoxy)phenol, 4-(3,5-dichloro-2-pyridyloxy)phenol, 4-(5-nitro-2-pyridyloxy)phenol, 4-(4-nitrophenoxy)phenol, 4-(4-bromo-2-chlorophenoxy)phenol, 4-(4-trifluoromethyl-2-nitrophenoxy)phenol, 4-(2,6-dichloro-4-trifluoromethylphenoxy)phenol, 4-(2-cyano-4-trifluoromethylphenoxy)phenol, 4-(2-chloro-4-cyanophenoxy)phenol, 4-(3-chloro-5-nitro-2-pyridyloxy)phenol, 4-(5-trifluoromethyl-2-pyridyloxy)phenol, 4-(3-chloro-5-trifluoromethyl-2-pyridyloxy)phenol, 4-(5-bromo-3-chloro-2-pyridyloxy)phenol, and 4-(4-chloro-2-methylphenoxy)phenol; as well as the alkali metal (e.g. Li, Na and K) salts thereof.
Examples of the other starting materials of the formula (III) for use in reaction variant (a) are:
2-benzyloxyethyl-2-chloro(or bromo)propionate, 3-benzyloxypropyl 2-chloro(or bromo)propionate, 1-methyl-2-benzyloxyethyl 2-chloro(or bromo)propionate, 2-α-methylbenzyloxyethyl 2-chloro(or bromo)propionate, 2-(2-fluorobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(4-fluorobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(2-chlorobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(4-chlorobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(2,4-dichlorobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(3,4-dichlorobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(2,6-dichlorobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(2-methylbenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(3-nitrobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(4-methoxybenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(4-bromobenzyloxy)ethyl 2-chloro(or bromo)propionate, 1-methyl-2-α-methylbenzyloxyethyl 2-chloro(or bromo)propionate, 2-(3-chlorobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(2-bromobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(3-fluorobenzyloxy)ethyl 2-chloro(or bromo)propionate, 1-methyl-2-(2-fluorobenzyloxy)ethyl 2-chloro(or bromo)-propionate, 3-(2-fluorobenzyloxy)propyl 2-chloro(or bromo)propionate, 2-(2-nitrobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(4-nitrobenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(4-methylbenzyloxy)ethyl 2-chloro(or bromo)propionate, 2-(2-methoxybenzyloxy)ethyl 2-chloro(or bromo)propionate, and 3-(4-fluorobenzyloxy)propyl 2-chloro(or bromo)propionate.
Reaction variant (a) according to the present invention is preferably carried out in a presence of a diluent. For this purpose, any inert solvents may be employed.
Example of such solvents and diluents include water; aliphatic, alicyclic and aromatic hydrocarbons--each of which may optionally be chlorinated (such as hexane, cyclohexane, petroleum ether, ligroin, benzene, toluene, xylene, methylene chloride, chloroform, carbon tetrachloride, ethylene chloride, tri-chloroethylene, and chlorobenzene), ethers (such as diethyl ether, methyl ethyl ether, diisopropyl ether, dibutyl ether, propylene oxide, dioxane, and tetrahydrofuran), kenotes (such as acetone, methyl ethyl ketone, methyl i-propyl ketone, and methyl isobutyl ketone), nitriles (such as acetonitrile, propionitrile, and acrylonitrile), alcohols (such as methanol, ethanol, iso-propanol, butanol, and ethylene glycol), esters (such as ethyl acetate and amyl acetate), acid amides (such as dimethylformamide and dimethylacetamide) sulfones and sulfoxides (such as dimethylsulfoxide and sulfolane) and bases (such as pyridine).
The reaction variant (a) is preferably carried out in the presence of an acid-binding agent. As example of such acid-binding agents, there may be mentioned hydroxides, carbonates, bicarbonates and alcoholates of alkali metals, and tertiary amines such as triethylamine, diethylaniline, pyridine.
Reaction variant (a) can be carried out over a wide range of temperatures. Generally, it is carried out at a temperature between -20� C. and the boiling point of the reaction mixture, preferably between 0� C. and 100� C.
This reaction variant(a) is preferably carried out under ambient pressure, although it can be effected under elevated or reduced pressure.
Examples of the compounds of the formula (IV) used as starting materials in reaction variant (b) are: 2-[4-(4-trifluoromethylphenoxy)phenoxy]propionyl chloride, 2-[4-(2-trifluoromethylphenoxy)phenoxy]propionyl chloride, 2-[4-(4-fluorophenoxy)phenoxy]propionyl chloride, 2-[4-(2,4-dichlorophenoxy)phenoxy]propionyl chloride, 2-[4-(2-chloro-4-nitrophenoxy)phenoxy]propionyl chloride, 2-[4-(2-trifluoromethyl-4-chlorophenoxy)phenoxy]propionyl chloride, 2-[4-(3,5-dichloro-2-pyridyloxy)phenoxy]propionyl chloride, 2-[4-(4-trifluoromethyl-2-chlorophenoxy)phenoxy]propionyl chloride, 2-[4-(5-nitro-2-pyridyloxy)phenoxy]propionyl chloride, 2-[4-(4-nitrophenoxy)phenoxy]propionyl chloride, 2-[4-(4-bromo-2-chlorophenoxy)phenoxy]propionyl chloride, 2-[4-(4-trifluoromethyl-2-nitrophenoxy)phenoxy]propionyl chloride, 2-[4-(2,6-dichloro-4-trifluoromethylphenoxy)phenoxy]propionyl chloride, 2-[4-(2-cyano-4-trifluoromethylphenoxy)phenoxy]propionyl chloride, 2-[4-(2-chloro-4-cyanophenoxy)phenoxy]propionyl chloride, 2-[4-(3-chloro-5-nitro-2-pyridyloxy)phenoxy] propionyl chloride, 2-[4-(5-trifluoromethyl-2-pyridyloxy)phenoxy]-propionyl chloride, 2-[4-(3-chloro-5-trifluoromethyl-2-pyridyloxy)phenoxy]propionyl chloride, 2-[4-(5-bromo-3-chloro-2-pyridyloxy)phenoxy]propionyl chloride, and 2-[4-(4-chloro-2-methylphenoxy)phenoxy]propionyl chloride; as well as the corresponding bromides or free propionic acid derivatives.
Examples of the other starting materials of the formula (V) for use in reaction variant (b) are: 2-benzyloxyethanol, 3-benzyloxypropanol, 1-benzyloxy-2-propanol, 2-α-methylbenzyloxyethanol, 2-(2-fluorobenzyloxy)ethanol, 2-(4-fluorobenzyloxy)ethanol, 2-(2-chlorobenzyloxy)ethanol, 2-(4-chlorobenzyloxy)ethanol, 2-(2,4-dichlorobenzyloxy)ethanol, 2-(3,4-dichlorobenzyloxy)ethanol, 2-(2,6-dichlorobenzyloxy)ethanol, 2-(2-methylbenzyloxy)ethanol, 2-(3-nitrobenzyloxy)ethanol, 2-(4-methoxybenzyloxy)ethanol, 2-(4-bromobenzyloxy)ethanol, 1-(α-methylbenzyloxy)-2-propanol, 2-(3-chlorobenzyloxy)ethanol, 2-(2-bromobenzyloxy)ethanol, 2-(3-fluorobenzyloxy)ethanol, 1-(2-fluorobenzyloxy)-2-propanol, 3-(2-fluorobenzyloxy)propanol, 2-(2-nitrobenzyloxy)ethanol, 2-(4-nitrobenzyloxy)ethanol, 2-(4-methylbenzyloxy)ethanol, 2-(2-methoxybenzyloxy)ethanol, and 3-(4-fluorobenzyloxy)propanol.
In carrying out reaction variant (b) any of the inert solvents or diluents as described hereinbefore for reaction variant (a) is preferably used to obtain the end product with high purity in high yield. Likewise reaction variant (b) is preferably carried out in the presence of an acid-binding agent as described hereinbefore for reaction variant (a).
Reaction variant (b) can be carried within the same reaction conditions of temperature and pressure as those mentioned hereinbefore for reaction variant (a).
Examples of the compounds of the formula (VI) used as starting materials in reaction variant (c) are: 4-(or 2-)trifluoromethyl chloro (or bromo)benzene, 1-chloro-4-fluorobenzene, 1,2,4-trichlorobenzene, 1-bromo-2,4-dichlorobenzene, 3,4-dichloro-nitrobenzene, 4-bromo-3-chloro-nitrobenzene, 1,4-dichloro-2-trifluoromethylbenzene, 1-bromo-4-chloro-2-trifluoromethylbenzene, 1,2-dichloro-4-trifluoromethylbenzene, 1-bromo-2-chloro-4-trifluoromethylbenzene, 2,3,5-trichloropyridine, 2-bromo-3,5-dichloropyridine, 2-chloro(or bromo)-5-nitropyridine, 4-chloro(or bromo)nitrobenzene, 1-bromo-3,4-dichlorobenzene, 2-chloro-1,4-dibromobenzene, 2-chloro(or bromo)-5-trifluoromethylnitrobenzene, 1,2,3-trichloro-5-trifluoromethylbenzene, 1-bromo-2,6-dichloro-4-trifluoromethylbenzene, 2-chloro(or bromo)-5-trifluoromethyl benzonitrile, 3,4-dichlorobenzonitrile, 4-bromo-3-chloro benzonitrile, 2,3-dichloro-5-nitropyridine, 2-bromo-3-chloro-5-nitropyridine, 2-chloro(or bromo)-5-trifluoromethylpyridine, 2,3-dichloro-5-trifluoromethylpyridine, 2-bromo-3-chloro-5-trifluoromethylpyridine, 5-bromo-2,3-dichloropyridine, 3-chloro-2,5-dibromopyridine, 2,5-dichlorotoluene and 2-bromo-5-chlorotoluene.
Example of the other starting materials of the formula (VII) also used in reaction variant (c) are:
2-benzyloxyethyl 2-(4-hydroxyphenoxy)propionate, 3-benzyloxypropyl 2-(4-hydroxyphenoxy)propionate, 1-methyl-2-benzyloxyethyl 2-(4-hydroxyphenoxy)propionate, 2-α-methylbenzyloxyethyl 2-(4-hydroxyphenoxy)propionate, 2-(2-fluorobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(4-fluorobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(2-chlorobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(4-chlorobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(2,4-dichlorobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(3,4-dichlorobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(2,6-dichlorobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(2-methylbenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(3-nitrobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(4-methoxybenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(4-bromobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 1-methyl-2-α-methylbenzyloxyethyl 2-(4-hydroxyphenoxy)propionate, 2-(3-chlorobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(2-bromobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(3-fluorobenzyloxy)ethyl2-(4-hydroxyphenoxy)propionate, 1-methyl-2-(2-fluorobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 3 -(2-fluorobenzyloxy)propyl 2-(4-hydroxyphenoxy)propionate, 2-(2-nitrobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(4-nitrobenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 2-(2-methoxybenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate, 3-(4-fluorobenzyloxy)propyl 2-(4-hydroxyphenoxy)propionate, and 2-(4-methylbenzyloxy)ethyl 2-(4-hydroxyphenoxy)propionate; as well as the alkali metal (e.g. Li, Na and K) salts thereof.
In carrying out reaction variant (c) any of the inert solvents or diluents as described hereinbefore for reaction variant (a) is preferably used to obtain the end product with high purity in high yield. Likewise reaction variant (c) is preferably carried out in the presence of an acid-binding agent as described hereinbefore for reaction variant (a).
Reaction variant (c) can be carried within the same reaction conditions of temperature and pressure as those mentioned hereinbefore for reaction variant (a).
The intermediate compound of the formula (III), (which may also be used as an intermediate in the production of intermediates of the formula (VII)) have not hitherto been disclosed in the literature and form a further subject of the present invention.
Thus, the present invention further provides a process for the production of a compound of the general formula (III), which comprises reacting a compound of the general formula ##STR25## in which Z1 and Z2 have the meanings given above, with a compound of the general formula ##STR26## in which R1, R2, X, a and n have the meanings given above.
Examples of the compounds of the formula (VIII) used as starting materials in the production of compounds of formula (III) are: 2-bromopropionic acid and 2-chloropropionic acid; as well as acyl chloride and acyl bromide thereof.
Examples of the other starting materials of the formula (IX) also used in the production of compounds of formula (III) are:
2-benzyloxyethanol, 3-benzyloxypropanol, 1-methyl-2-benzyloxyethanol, 2-α-methyl benzyloxyethanol, 2-(2-chlorobenzyloxy)ethanol, 2-(3-chlorobenzyloxy)ethanol, 2-(4-chlorobenzyloxy)ethanol, 2-(2,4-dichlorobenzyloxy)ethanol, 2-(2,6-dichlorobenzyloxy)ethanol, 2-(3,4-dichlorobenzyloxy)ethanol, 2-(2-methylbenzyloxy)ethanol, 2-(4-methylbenzyloxy)ethanol, 2-(2-methoxybenzyloxy)ethanol, 2-(4-methoxybenzyloxy)ethanol, 2-(2-bromobenzyloxy)ethanol, 2-(4-bromobenzyloxy)ethanol, 1-methyl-2-α-methylbenzylethanol, 2-(2-fluorobenzyloxy)ethanol, 2-(3-fluorobenzyloxy)ethanol, 2-(4-fluorobenzyloxy)ethanol, 2-(2-nitrobenzyloxy)ethanol, 2-(3-nitrobenzyloxy)ethanol, 2-(4-nitrobenzyloxy)ethanol, 1-methyl-2-(2-fluorobenzyloxy)ethanol, 3-(2-fluorobenzyloxy)propanol, 3-(4-fluorobenzyloxy)propanol.
If 2-bromopropionyl bromide and 2-benzyloxyethanol are used as starting materials, the course of the reaction for the production of compounds of formula (III) is illustrated by the following equation: ##STR27##
In the process for the production of compounds of formula (III) any of the inert solvents or diluents as described hereinbefore for reaction variant (a) is preferably used to obtain the end products with high purity in high yield. Likewise this reaction is preferably carried out in the presence of the acid-binding agent as described hereinbefore for reaction variant (a).
The reaction conditions of temperature and pressure are also chosen from those mentioned hereinbefore for reaction variant (a).
The starting compounds of formula (VII) are also novel and form a further subject of the present invention.
The present invention further provides a process for the production of a compound of the formula (VII), which comprises reacting a compound of the formula ##STR28## with a compound of the general formula ##STR29## in which R1, R2, X, a, n and Z1 have the meanings given above.
Example of the compounds of the formula (III) used as starting materials have already been mentioned as preferred starting materials for reaction variant (a) and can be prepared as described above.
If hydroquinone and 2-benzyloxyethyl-2-bromopropionate are used as starting materials, the course of the reaction for the production of compounds of formula (VII) is illustrated by the following equation: ##STR30##
In the process for the production of compounds of formula (VII) any of the inert solvents or diluents as described hereinbefore for reaction variant (a) is preferably used to obtain the end products with high purity in high yield. Likewise this reaction is preferably carried out in the presence of the acid-binding agent as described hereinbefore for reaction variant (a).
The active compounds of formula (I) according to the present invention show excellent selective herbicidal effect when used as soil-treating agents to be used pre- or post-emergence of gramineous weeds.
Since the active compounds according to the present invention show little or no toxicity towards warm-blooded animals and show good selectivity for agricultural plants, that is, cause no phytotoxicity for agricultural plants, they can be conveniently used as herbicides for controlling weeds.
The active compounds according to the invention influence plant growth and can therefore be used as defoliants, desiccants, agents for destroying broadleaved plants, germination inhibitors and, especially, as weed-killers. By "weeds" in the broadest sense there are meant plants growing in places where they are not desired.
Whether the compounds according to the invention act as total herbicides or selective herbicides depends essentially on the amount used.
The active compounds according to the present invention may be used, for example, to combat the following plants: dicotyledon weeds of the genera Sinapis, Lepidium, Galium, Stellaria, Matricaria, Anthemis, Galinsoga, Chenopodium, Urtica, Senecio, Amaranthus, Portulaca, Xanthium, Convolvulus, Ipomoea, Polygonum, Sesbania, Ambrosia, Cirsium, Carduxs, Sonchus, Rorippa, Rotala, Lindernia, Lamium, Veronica, Abutilon, Emex, Datura, Viola, Galeopsis, Papaver, Centaurea and Solanum; and monocotyledon weeds of the genera Echinochloa, Setaria, Panicum, Digitaria, Phleum, Poa, Festuca, EIeusine, Brachiaria, Lolium, Bromus, Avena, Cyperus, Sorghum, Agropyron, Cynodon, Monochoria, Fimbristylis, Sagittaria, Eleocharis, Scirpus, Paspalum, Ischaemum, Sphenoclea, Dactyloctenium, Agrostis, Alopecurus and Apera.
dicotyledon cultures of the genera Gossypium, Glycine, Beta, Daucus, Phaseolus, Pisum, Solanum, Linum, Ipomoea, Vicia, Nicotiana, Lycopersicon, Arachis, Brassica, Lactuca, Cucumis and Cucurbita; and monocotyledon cultures of the genera Oryza, Zea, Triticum, Hordeum, Avena, Secale, Sorghum, Panicum, Saccharum, Ananas, Asparagus and Allium.
The active compounds according to the present invention may particularly be used to combat the following plants: Echinochloa crusgalli, Digitaria adscendeno, Eleusine indica, Setaria viridis, Avena fatua, Alopecurus aequalis, Setaria lutescens, Agropyron repens or Agropyron tsukushiense.
In addition, they show excellent herbicidal and regrowth-control effects on, for example, Sorghum halepense or Cynodon dactylon.
The active compounds can be converted into the customary formulations, such as solutions, emulsions, wettable powders, suspensions, dusting agents, soluble powders, granules, suspension-emulsion concentrates, natural and synthetic materials impregnated with active compound, and very fine capsules in polymeric substances.
These formulations may be produced in known manner, for example by mixing the active compounds with extenders, that is to say liquid or solid diluents or carriers, optionally with the use of surface-active agents, that is to say emulsifying agents. In the case of the use of water as an extender, organic solvents can, for example, also be used as auxiliary solvents.
The formulations in general contain from 0.001 to 100 percent by weight of active compound, preferably from 0.005 to 95 percent by weight.
The active compounds according to the invention, as such or in the form of their formulations, can also be used, for combating weeds, as mixtures with known herbicides, finished formulations or tank mixing being possible. Mixtures with other known active compounds, such as fungicides, insecticides, acaricides, nematicides, bird repellants, growth factors, plant nutrients and agents which improve soil structure, are also possible.
The active compounds can be used as such, in the form of their formulations or in the use forms prepared therefrom by further dilution, such as ready-to-use solutions, suspensions, emulsions, powders, pastes and granules. They may be used in the customary manner, for example by watering, spraying, atomising, scattering or dusting.
The amount of active compound in the ready-to-use preparations can vary widely according to circumstance. However, it is in general from 0.01 to 95 percent, preferably from 0.05 to 60 percent by weight.
The compounds can also be used in the ultra-low-volume method, wherein the preparation used can contain up to 100% of the active ingredient.
The active compounds can be applied after emergence of the plants or before emergence of the plants, that is to say by the pre-emergence method. They can also be incorporated into the soil before sowing.
The amount of active compound used can vary within a substantial range. It depends essentially on the nature of the desired effect. In general, the amounts used are between 0.01 and 2 kg of active compound per hectare, preferably between 0.05 and 1 kg/ha.
The present invention also provides a herbicidal composition containing as active ingredient a compound of the present invention in admixture with a solid diluent or carrier or in admixture with a liquid diluent or carrier containing a surface-active agent.
The present invention also provides a method of combating weeds which comprises applying to the weeds, or to a habitat thereof, a compound of the present invention alone or in the form of a composition containing as active ingredient a compound of the present invention in admixture with a diluent or carrier.
Compositions according to this invention are illustrated in the following Examples.
In these Examples, the compounds according to the present invention are each identified by the number (given in brackets) of the corresponding preparative Example. References to "parts" are to be understood as meaning parts by weight.
Fifteen parts of compound (I), 80 parts of a 1:5 mixture of powdered diatomaceous earth and powdered clay, 2 parts of sodium alkylbenzenesulfonate and 3 parts of sodium alkylnaphthalenesulfonate/formaldehyde condensate were ground and mixed to form a wettable powder. The wettable powder was diluted with water before use.
Thirty parts of compound (11), 55 parts of xylene, 8 parts of polyoxyethylene alkylphenyl ether and 7 parts of calcium alkylbenzenesulfonate were mixed with stirring to form an emulsifiable concentrate. The emulsifiable concentrate was diluted with water before use.
Two parts of compound (12) and 98 parts of powdered clay were pulverized and mixed to form a dusting agent.
1.5 parts of compound (13), 0.5 part of isopropyl hydrogen phosphate (PAP) and 98 parts of powdered clay were ground and mixed to form a dusting agent.
25 parts of water were added to, and thoroughly mixed with, a mixture of 10 parts of compound (14), 30 parts of bentonite (montmorillonite), 58 parts of talc and 2 parts of lignin sulfonate. The resultant mixture was formed into granules having a size of 10 to 40 mesh by means of an extrusion-type granulator, and dried at 40� to 50� C. to form granules.
A rotary mixer was charged with 95 parts of clay mineral particles having a particle size distribution in the range of 0.2 to 2 mm, and, while rotating the mixer, 5 parts of compound (2) dissolved in an organic solvent were sprayed uniformly onto the clay mineral particles. The particles were then dried at 40� to 50� C. to form granules.
The herbicidal activity of the compounds of the formula (I) is illustrated by the following biotest Examples.
In these Examples, the compounds according to the present invention are each identified by the number (given in brackets) of the corresponding preparative Example.
The known comparison compound is identified as follows: ##STR31## (They are described in Japanese Laid-open Patent Application No. 51-106,735). ##STR32## (A compound described in Japanese Laid-open Patent Application No. 52-131,545). ##STR33## (A compound described in Japanese Laid-open Patent Application No. 52-144,637). ##STR34## (A compound described in Japanese Laid-open Patent Application No. 54-119,476).
Pre-emergence Treatment Tests for Weeds and Crops in Upland Fields
Preparation of active compound:
A preparation of the active compound was obtained as an emulsifiable concentrate by mixing 1 part by weight of the active compound with the aforesaid amounts of the carrier and the emulsifier. A predetermined amount of the preparation was obtained by dilution with water.
Field soils placed in 1,000 cm2 pots were respectively seeded with Arachis, Pisum, Gossypium and Glycine in a greenhouse, and covered with a soil mixed with seeds of Agropyron repens, Echinochloa crus-galli and Setaria lutescens in a depth of 1 cm. One day after the seeding, 10 ml of the above-prepared solutions respectively containing 500 ppm, 200 ppm, 100 ppm, and 50 ppm active ingredient were uniformly applied to the soil surface layer.
4 weeds after the treatment, the herbicidal effect and degree of phytotoxicity were evaluated on a scale of from 0 to 10 in accordance with the following standards.
The herbicidal effect was evaluated as follows in comparison with an untreated control.
______________________________________Rating      Weed-kill ratio based on the control______________________________________10          100% (withered)9           at least 90% but less than 100%8           at least 80% but less than 90%7           at least 70% but less than 80%6           at least 60% but less than 70%5           at least 50% but less than 60%4           at least 40% but less than 50%3           at least 30% but less than 40%2           at least 20% but less than 30%1           at least 10% but less than 20%0           less than 10% (not effective)______________________________________
The phytotoxicity towards the crops was evaluated as follows in comparison with the untreated control.
______________________________________Rating   Phytotoxicity rate in comparison with the control______________________________________10       at least 90% (fatal damage)9        at least 80% but less than 90%8        at least 70% but less than 80%7        at least 60% but less than 70%6        at least 50% but less than 60%5        at least 40% but less than 50%4        at least 30% but less than 40%3        at least 20% but less than 30%2        at least 10% but less than 20%1        more than 0% but less than 10%0        0% (no phytotoxicity)______________________________________
The test results are shown in Table 1 in which the symbols a to g represent the following weeds and crops:
a: Agropyron repens
c: Setaria lutescens
d: Arachis
e: Pisum
f: Gossypium
TABLE 1______________________________________Amount ofEffective     Herbicidal Effect                      PhytotoxicityIngredient    Weed         Cropkg/ha         a      b      c    d   e    f   g______________________________________CompoundNo. 1      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       8      9    10   0   0    0   0   0.05      6      7    9    0   0    0   0 3      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       8      9    10   0   0    0   0   0.05      6      7    9    0   0    0   0 4      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       8      9    9    0   0    0   0   0.05      6      7    8    0   0    0   036      0.5       10     10   10   0   0    0   0   0.2       10     9    10   0   0    0   0   0.1       8      8    9    0   0    0   0   0.05      6      7    8    0   0    0   037      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       8      9    10   0   0    0   0   0.05      7      8    9    0   0    0   038      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       8      9    10   0   0    0   0   0.05      7      8    10   0   0    0   039      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       9      9    10   0   0    0   0   0.05      8      8    9    0   0    0   029      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       10     10   10   0   0    0   0   0.05      9      10   10   0   0    0   043      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       9      9    10   0   0    0   0   0.05      8      7    9    0   0    0   014      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       8      8    9    0   0    0   0   0.05      6      6    8    0   0    0   057      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       8      8    9    0   0    0   0   0.05      6      6    8    0   0    0   062      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       10     10   10   0   0    0   0   0.05      9      9    9    0   0    0   063      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       9      9    9    0   0    0   0   0.05      8      8    9    0   0    0   064      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       9      9    9    0   0    0   0   0.05      8      9    9    0   0    0   020      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       9      9    9    0   0    0   0   0.05      8      8    9    0   0    0   022      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       9      9    9    0   0    0   0   0.05      8      8    9    0   0    0   024      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       9      9    9    0   0    0   0   0.05      8      8    8    0   0    0   071      0.5       10     10   10   0   0    0   0   0.2       9      10   9    0   0    0   0   0.1       8      9    9    0   0    0   0   0.05      7      8    8    0   0    0   073      0.5       10     10   10   0   0    0   0   0.2       10     10   10   0   0    0   0   0.1       9      9    9    0   0    0   0   0.05      8      9    9    0   0    0   0Com-parativeCompoundA-1     0.5       7      9    9    0   0    0   0   0.2       5      7    8    0   0    0   0   0.1       2      5    6    0   0    0   0   0.05      0      2    4    0   0    0   0B-1     0.5       9      10   10   0   0    0   0   0.2       7      8    8    0   0    0   0   0.1       3      6    7    0   0    0   0   0.05      0      3    4    0   0    0   0______________________________________
Foliage-Treating Tests for Weeds and Crops in Upland Fields
Field soils placed in 2,000 cm2 pots were respectively seeded with Glycine, Rephanus and Beta, and covered with a soil mixed with seeds of Echinochloa crus-galli, Digitaria adscendens, Eleusine indica, Setaria viridis, Avena fatua and Alopecurus aequalis in a depth of 1 cm. 10 days after seeding (when weeds were on the average in a second leaf stage and when Glycine, Rephanus and Beta were in the initial stage of normal leaf-growing period), 20 ml of the solutions prepared as in Test Example 1 and respectively containing 500 ppm, 200 ppm, 100 ppm, and 50 ppm active ingredient were uniformly applied to the leaves of the plants to be tested.
3 weeds after the treatment, the herbicidal effect and degree of phytotoxicity were evaluated in the same manner as in Example A.
The test results are shown in Table 2 in which the symbols h to p represent the following weeds and crops:
h: Echinochloa crus-galli
i: Digitaria adscendens
j: Eleusine indica
k: Setaria viridis
l: Avena fatua
m: Alopecurus aequalis
n: Glycine
o: Rephanus
p: Beta
TABLE 2______________________________________Amount ofEffective     Herbicidal Effect                         PhytotoxicityIngredient    Weed            Cropkg/ha         h     i     j   k   l   m   n   o    p______________________________________CompoundNo. 1      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  10  10  10  10  0   0    0 2      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  10  10  10  10  0   0    0 3      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  10  10  9   10  0   0    0 4      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    9   9   9   9   10  0   0    0   0.05      9     9   9   9   8   9   0   0    037      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  10  10  10  10  0   0    038      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  10  10  10  10  0   0    039      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  10  10  10  10  0   0    029      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  10  10  10  10  0   0    040      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  10  10  10  10  0   0    041      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  9   9   8   9   0   0    0   0.05      9     9   8   8   7   8   0   0    043      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  9   9   9   9   0   0    047      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  9   9   10  0   0    0   0.05      9     10  9   8   7   9   0   0    048      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  9   9   8   10  0   0    0   0.05      9     9   8   8   7   9   0   0    049      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  10  10  10  10  0   0    050      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  9   10  0   0    0   0.05      9     10  9   9   8   9   0   0    051      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  10  10  9   10  0   0    054      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  9   9   9   9   0   0    056      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  9   9   9   10  0   0    0   0.05      9     9   8   8   8   9   0   0    057      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    9   9   9   9   10  0   0    0   0.05      9     8   8   9   7   9   0   0    058      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    9   10  9   9   9   0   0    016      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  9   9   9   10  0   0    059      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    9   10  9   9   9   0   0    0   0.05      9     7   9   9   8   9   0   0    060      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       9     9   9   9   9   10  0   0    0   0.05      9     8   8   8   8   9   0   0    062      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    9   10  10  9   9   0   0    0   0.05      9     8   9   9   9   9   0   0    017      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    9   10  10  10  10  0   0    0   0.05      9     8   9   9   9   9   0   0    063      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    9   10  10  10  9   0   0    0   0.05      10    8   9   9   9   9   0   0    064      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    8   10  10  9   9   0   0    0   0.05      9     7   9   9   8   8   0   0    066      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    8   10  9   9   9   0   0    0   0.05      9     7   9   9   8   8   0   0    067      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  9   10  0   0    0   0.05      10    9   9   9   9   9   0   0    020      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0 - 0.1 10 10 10 10 1                                                0 10 0 0 0   0.05      10    9   9   9   9   9   0   0    021      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    9   9   9   9   10  0   0    069      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  9   10  10  10  0   0    0   0.05      9     9   9   9   9   9   0   0    070      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    9   9   10  9   9   0   0    0   0.05      9     9   9   9   9   9   0   0    024      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    9   9   9   9   10  0   0    025      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    9   9   9   9   10  0   0    071      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    9   10  10  9   9   0   0    027      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    10  10  10  9   9   0   0    072      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  9   10  9   0   0    0   0.05      10    9   9   9   9   9   0   0    023      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    9   9   9   9   9   0   0    075      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    9   9   9   9   9   0   0    077      0.5       10    10  10  10  10  10  0   0    0   0.2       10    10  10  10  10  10  0   0    0   0.1       10    10  10  10  10  10  0   0    0   0.05      10    9   9   9   9   9   0   0    0Compara-tiveCompoundA-2     0.5       10    10  10  10  9   10  0   0    0   0.2       9     10  9   9   7   10  0   0    0   0.1       7     8   6   7   5   8   0   0    0   0.05      5     5   5   6   4   6   0   0    0C-1     0.5       10    10  9   10  9   10  0   0    0   0.2       10    9   6   9   6   9   0   0    0   0.1       7     5   3   6   3   6   0   0    0   0.05      3     2   1   3   1   3   0   0    0______________________________________
Herbicidal and Regrowth-Control Tests for Agropyron Tsukushiense
Rice fields where Agropyron tsukushiense was gregarious was divided into 1 m2 sections. 100 ml portions of solutions prepared as in Test Example 1 and respectively containing 1,000 ppm, 500 ppm, 200 ppm, and 100 ppm of the active ingredient were applied to the foliage of Agropyron tsukusiense in each section. 20 days after the treatment, the herbicidal effects were evaluated in the same manner as in Example A. Further, the effect of controlling regrowth of Agropyron tsukusiense was evaluated 40 days and 60 days after the treatment in accordance with the following standards.
______________________________________     Regrowth-control ratioRating    based on untreated section______________________________________10        100% (complete control of regrowth)9         at least 90% but less than 100%8         at least 80% but less than 90%7         at least 70% but less than 80%6         at least 60% but less than 70%5         at least 50% but less than 60%4         at least 40% but less than 50%3         at least 30% but less than 40%2         at least 20% but less than 30%1         at least 10% but less than 20%0         less than 10% (no regrowth-control effect)______________________________________
TABLE 3______________________________________        Herbicidal                Regrowth-control        Effect  EffectAmount of      20 Days   40 Days    60 DaysEffective      After     After      AfterIngredient     Applica-  Applica-   Applica-kg/ha          tion      tion       tion______________________________________Com-poundNo. 1     1.0         10        10       10  0.5         10        10       10  0.2         10        10       10  0.1         9         8        729     1.0         10        10       10  0.5         10        10       10  0.2         10        10       10  0.1         9         8        757     1.0         10        10       10  0.5         10        10       10  0.2         10        10       9  0.1         10        9        820     1.0         10        10       10  0.5         10        10       10  0.2         10        10       10  0.1         9         9        821     1.0         10        10       10  0.5         10        10       10  0.2         10        10       10  0.1         9         8        824     1.0         10        10       10  0.5         10        10       10  0.2         10        10       10  0.1         9         8        773     1.0         10        10       10  0.5         10        10       10  0.2         10        10       9  0.1         9         9        876     1.0         10        10       10  0.5         10        10       10  0.2         10        10       10  0.1         9         8        7Compar-ativeCom-poundB-1    1.0         10        10       6  0.5         7         6        3  0.2         4         3        0  0.1         1         0        0D-1    1.0         10        10       7  0.5         9         7        2  0.2         6         3        0  0.1         3         0        0______________________________________
Herbicidal and Regrowth-Control Test for Cynodon dactylon
Upland field where Cynodon dactylon was gregarious was divided into 1 m2 sections. The active ingredient in the same quantities as in Example C was treated to the Cynodon dactylon.
Herbicidal effect was evaluated 20 days after the treatment, and regrowth-control effect was evaluated 40 days and 60 days after the treatment in accordance with the same manner as in the foregoing Examples A to C.
TABLE 4______________________________________        Herbicidal                Regrowth-control        Effect  EffectAmount of      20 Days   40 Days    60 DaysEffective      After     After      AfterIngredient     Applica-  Applica-   Applica-kg/ha          tion      tion       tion______________________________________Com-poundNo. 1     1.0         10        10       10  0.5         10        10       10  0.2         10        10       10  0.1         8         7        5 2     1.0         10        10       10  0.5         10        10       10  0.2         10        10       8  0.1         10        8        7 4     1.0         10        10       10  0.5         10        10       10  0.2         10        10       9  0.1         9         8        637     1.0         10        10       10  0.5         10        10       10  0.2         10        10       8  0.1         9         8        720     1.0         10        10       10  0.5         10        10       10  0.2         10        9        8  0.1         9         9        721     1.0         10        10       10  0.5         10        10       10  0.2         10        9        8  0.1         9         8        774     1.0         10        10       10  0.5         10        10       10  0.2         10        9        8  0.1         9         8        778     1.0         10        10       10  0.5         10        10       10  0.2         10        9        8  0.1         9         7        6Compar-ativeCom-poundB-1    1.0         10        9        5  0.5         8         5        2  0.2         5         2        0  0.1         4         0        0D-1    1.0         10        10       7  0.5         9         7        5  0.2         7         3        0  0.1         5         1        0______________________________________
Other compounds of the present invention employed in the foregoing Examples A to D were also confirmed to show excellent herbicidal effect in the same low amount as in the foregoing Examples A to D and to show regeneration-controlling effect on perennial gramineous weeds over a long period of time.
The following examples serve to illustrate processes for the production of compounds according to the present invention.
25.4 g of 4-(4-trifluoromethylphenoxy)phenol were added to 150 ml of dry acetonitrile, and 28.7 g of 2-benzyloxyethyl 2-bromopropionate and 14.5 g of anhydrous potassium carbonate were added thereto. Then, the mixture was refluxed for 4 hours, stirring well. After the completion of the reaction, acetonitrile was distilled off under reduced pressure.
Toluene was added to the residue, and the toluene layer was washed successively with 1% strength by weight sodium hydroxide aqueous solution and water. Upon distilling off toluene under reduced pressure, there were obtained 41 g of colourless, viscous end product, 2-benzyloxyethyl 2-(4-[4-trifluoromethylphenoxy)phenoxy]propionate.
nD 20 1.5300.
30.6 g of 4-(3,5-dichloro-2-pyridyloxy)phenol sodium salt and 30.5 g of 2-(4-fluorobenzyloxy)ethyl 2-chloropropionate were added to 100 ml of dimethylformamide, and the mixture was heated to 70� to 80� C. for 3 hours with stirring. After cooling to room temperature, the reaction solution was poured into 300 ml of water, then extracted with ether. The ether layer was washed successively with 1% strength by weight sodium hydroxide aqueous solution and water, followed by dehydration. Upon distilling off the ether, there were obtained 38 g of a pale yellow, viscous, oily end product, 2-(4-fluorobenzyloxy)ethyl 2-[4-(3,5-dichloro-2-pyridyloxy)phenoxy]propionate.
nD 20 1.5643.
22.1 g of 2-(2,6-dichlorobenzyloxy)ethanol and 10.1 g of triethylamine were dissolved in 200 ml of toluene, then cooled to 0� C. To this solution was dropwise added a solution of 34.5 g of 2-[4-(4-trifluoromethylphenoxy)phenoxy]propionyl chloride in 50 ml of toluene at 0� to 10� C. After the dropwise addition, the reaction mixture was gradually heated and, at 40� C., it was stirred for one hour to complete the reaction. After cooling the reaction solution to room temperature, it was washed successively with 1% strength by weight sodium hydroxide aqueous solution and water, then dehydrated. After distilling off toluene under reduced pressure, the resulting colorless, viscous, oily product was allowed to stand for about 1 month to obtain 49.2 g of crystalline 2-(2,6-dichlorobenzyloxy)ethyl 2-[4-(4-trifluoromethylphenoxy)phenoxy]propionate. m.p. 51� to 53� C.
16.6 g of 1-benzyloxy-2-propanol and 10.6 g of triethylamine were dissolved in 200 ml of toluene, then cooled to 0� C. To this solution was dropwise added a solution of 34.7 g of 2-[4-(3,5-dichloro-2-pyridyloxy)phenoxy]propionyl chloride in 80 ml of toluene at 0� to 5� C. with stirring. After the dropwise addition, the mixture was gradually heated and, at 40� to 50� C., it was stirred for one hour to complete the reaction. After cooling to room temperature, it was washed successively with 1% strength by weight sodium hydroxide aqueous solution and water, followed by drying. Upon distilling off toluene under reduced pressure, there were obtained 43.3 g of pale yellow, viscous, oily 1-methyl-2-benzyloxyethyl 2-[4-(3,5-dichloro-2-pyridyloxy)phenoxy]propionate. nD 20 1.5710.
In the same manner as described in Example 1 or 2 but using starting materials given in the following table, there were synthesized the compounds of the present invention as shown in the table.
__________________________________________________________________________ExampleNo.  Starting Material               Starting Material                             Product/Physical Constant__________________________________________________________________________6    4-(4-Trifluoromethyl-               1-Methyl-2-(2-fluorobenzy-                             1-Methyl-2-(2-fluorobenzyloxy)-phenoxy)phenol loxy)ethyl 2-chloro-                             ethyl 2-[4-(4-trifluoromethyl-               propionate    phenoxy)phenoxy]propionate7    4-(4-Trifluoromethyl-               3-(2-Fluorobenzyloxy)-                             3-(2-Fluorobenzyloxy)propylphenoxy)phenol propyl 2-bromopropionate                             2-[4-(4-trifluoromethylphenoxy)-                             phenoxy]propionate8    4-(4-Trifluoromethyl-               2-(3-Chlorobenzyloxy)-                             2-(3-Chlorobenzyloxy)ethylphenoxy)phenol sodium salt               ethyl 2-chloropropionate                             2-[4-(4-trifluoromethylphenoxy)-                             phenoxy]propionate9    4-(4-Trifluoromethyl-               2-(2-Bromobenzyloxy)ethyl                             2-(2-Bromobenzyloxy)ethylphenoxy)phenol sodium salt               2-chloropropionate                             2-[4-(4-trifluoromethylphenoxy)-                             phenoxy]propionate10   4-(4-Trifluoromethyl-               2-(4-Methylbenzyloxy)-                             2-(4-Methylbenzyloxy)ethyl 2-phenoxy)phenol sodium salt               ethyl 2-bromopropionate                             [4-(4-trifluoromethylphenoxy)-                             phenoxy]propionate11   4-(4-Trifluoromethylphenoxy)-               2-(2-Methoxybenzyloxy)-                             2-(2-Methoxybenzyloxy)ethyl 2-phenol sodium salt               ethyl 2-bromopropionate                             [4-(4-trifluoromethylphenoxy)-                             phenoxy]propionate12   4-(4-Trifluoromethyl-2-               2-Benzyloxyethyl                             2-Benzyloxyethyl 2-[4-(4-tri-chlorophenoxy)phenol               2-chloropropionate                             fluoromethyl-2-chlorophenoxy)-sodium salt                  phenoxy]propionate13   4-(4-Bromo-2-chlorophenoxy)-               2-Benzyloxyethyl                             2-Benzyloxyethylphenol sodium salt               2-chloropropionate                             2-[4-(4-bromo-2-chlorophenoxy)-                             phenoxy]propionate14   4-(2-Chloro-4-cyano-               2-Benzyloxyethyl                             2-Benzyloxyethylphenoxy)phenol sodium salt               2-chloropropionate                             2-[4-(2-chloro-4-cyanophenoxy)-                             phenoxy]propionate15   4-(2,6-Dichloro-4-trifluoro-               2-Benzyloxyethyl                             2-Benzyloxyethylmethylphenoxy)phenol sodium               2-chloropropionate                             2-[4-(2,6-dichloro-4-trifluoro-salt                         methylphenoxy)phenoxy]propionate16   4-(3,5-Dichloro-2-               1-Methyl-2-&#945;-methyl-                             1-Methyl-2-&#945;-methylbenzyloxy-pyridyloxy)phenol sodium               benzyloxyethyl                             ethyl 2-[4-(3,5-dichloro-2-salt           2-chloropropionate                             pyridyloxy)phenoxy]propionate17   4-(3,5-Dichloro-2-               3-(4-Fluorobenzyloxy)-                             3-(4-Fluorobenzyloxy)propylpyridyloxy)phenol sodium               propyl 2-bromopropionate                             2-[4-(3,5-dichloro-2-pyridyloxy)-SOH                          phenoxy]propionate18   4-(3,5-Dichloro-2-pyridyl-               2-(3-Chlorobenzyloxy)-                             2-(3-Chlorobenzyloxy)ethyloxy)phenol sodium salt               ethyl 2-chloropropionate                             2-[4-(3,5-dichloro-2-pyridyloxy)-                             phenoxy]propionate19   4-(3,5-Dichloro-2-pyridyl-               2-(4-Methylbenzyloxy)-                             2-(4-Methylbenzyloxy)ethyloxy)phenol sodium salt               ethyl 2-chloropropionate                             2-[4-(3,5-dichloro-2-pyridyloxy)-                             phenoxy]propionate20   2-Benzyloxyethanol               2-[4-(5-Trifluoromethyl-                             2-Benzyloxyethyl 2-[4-(5-tri-               2-pyridyloxy)phenoxy]-                             fluoromethyl-2-pyridyloxy)-               propionyl chloride                             phenoxy]propionate/m.p. 44-47�                             C.21   2-(2-Fluorobenzyloxy)-               2-[4-(5-Trifluoromethyl-                             2-(2-Fluorobenzyloxy)ethyl 2-[4-ethanol        2-pyridyloxy)phenoxy]-                             (5-trifluoromethyl-2-pyridyloxy)-               propionyl chloride                             phenoxy]propionate/m.p. 46-48.5�                             C.22   2-(4-Chlorobenzyloxy)-               2-[4-(5-Trifluoromethyl-                             2-(4-Chlorobenzyloxy)ethyl 2-[4-ethanol        2-pyridyloxy)phenoxy]-                             (5-trifluoromethyl-2-pyridyloxy)-               propionyl chloride                             phenoxy]propionate/nD 20                             1.535023   2-(4-Methoxybenzyloxy)-               2-[4-(5-trifluoromethyl-                             2-(4-Methoxybenzyloxy)ethyl 2-[4-ethanol        2-pyridyloxy)phenoxy]-                             (5-trifluoromethyl-2-pyridyloxy)-               propionyl bromide                             phenoxy]propionate/nD 20                             1.533524   1-Benzyloxy-2-propanol               2-[4-(5-Trifluoromethyl-2-                             1-Methyl-2-benzyloxyethyl 2-[4-               pyridyloxy)phenoxy]-                             (5-trifluoromethyl-2-pyridyloxy)-               propionyl bromide                             phenoxy]propionate/nD 20                             1.522425   3-Benzyloxypropanol               2-[4-(5-Trifluoromethyl-                             3-Benzyloxypropyl 2-[4-(5-tri-               2-pyridyloxy)phenoxy]-                             fluoromethyl-2-pyridyloxy)phenoxy]-               propionyl chloride                             propionate/nD 20 1.524526   2-Benzyloxyethanol               2-[4-(3-Chloro-5-nitro-2-                             2-Benzyloxyethyl 2-[4-(3-               pyridyloxy)phenoxy]-                             chloro-5-nitro-2-pyridyloxy)-               propionyl bromide                             phenoxy]propionate27   2-Benzyloxyethanol               2-[4-(3-Chloro-5-triflu-                             2-Benzyloxyethyl               oromethyl-2-pyridyloxy)-                             2-[4-(3-chloro-5-trifluoromethyl-               phenoxy]propionyl chloride                             2-pyridyloxy)phenoxy]propionate28   2-(2-Methoxybenzyloxy)-               2-[4-(3,5-Dichloro-2-                             2-(2-Methoxybenzyloxy)ethylethanol        pyridyloxy)phenoxy]-                             2-[4-(3,5-dichloro-2-pyridyloxy)-               propionyl chloride                             phenoxy]propionate__________________________________________________________________________
33.4 g of 2-(2-fluorobenzyloxy)ethyl-2-(4-hydroxyphenoxy)propionate was dissolved in 120 ml of dimethylformamide, 15.2 g of potassium carbonate were added thereto, then the mixture was heated at 95� C. for one hour with stirring. 27.1 g of 4-trifluoromethyl chlorobenzene were added to the solution which was then heated to 95� to 100� C. for five hours. After cooling the reaction solution to room temperature, it was poured into ice-water, then extracted with toluene. The toluene layer was washed successively with 1% strength by weight sodium hydroxide solution and water, and was dried and filtered. The toluene was distilled off under reduced pressure, and further volatile by-products were removed at 100� C./0.1 mmHg. The end product of 2-(2-fluorobenzyloxy)ethyl-2-[4-(4-trifluoromethylphenoxy)phenoxy]propionate was obtained in a yield of 20.7 g. (nD 20 1.5235)
31.6 g of 2-benzyloxyethyl-2-(4-hydroxyphenoxy)propionate were dissolved in 100 ml of dimethylsulfoxide, 15.2 g of potassium carbonate were added thereto, then the mixture was heated at 90� C. for one hour with stirring. 20.0 g of 2-chloro-5-trifluoromethylpyridine were added dropwise to this solution which was then maintained at 90� C. for a further two hours. After cooling the reaction solution to room temperature, it was poured into ice-water, then extracted with ether. The ether layer was dried and filtered, and the ether was distillated off. The end product of 2-benzyloxyethyl-2-[4-(5-trifluoromethyl-2-pyridyloxy)-phenoxy]propionate (a compound also produced in Example 20) was obtained in a yield of 41.0 g (m.p. 44�-47� C.).
EXAMPLES 31 TO 78
Compounds of the present invention shown in following Table 5 were obtained in substantially the same manner as in the foregoing Examples 1 to 30 (or, in the case of Example 40, as in foregoing Examples 1 to 28).
TABLE 5__________________________________________________________________________ ##STR41##Example                       PhysicalNo.  Ar        R1              R2                  n Xa                         constant__________________________________________________________________________31 ##STR42##          H   H   1 H    nD 20 1.532232 ##STR43##          H   H   1 H    nD 20 1.551833 ##STR44##          H   H   1 H    nD 20 1.569634 ##STR45##          H   H   1 H    nD 20 1.580535 ##STR46##          H   H   1 H    nD 20 1.539736 ##STR47##          H   H   1 H    nD 20 1.545037 ##STR48##          H   H   2 H    nD 20 1.526838 ##STR49##          CH3              H   1 H    nD 20 1.526039 ##STR50##          H   CH3                  1 H    nD 20 1.526640 ##STR51##          H   H   1 4-F  nD 20 1.521441 ##STR52##          H   H   1 2-Cl nD 20 1.536042 ##STR53##          H   H   1 2-Cl nD 20 1.555043 ##STR54##          H   H   1 4-Cl nD 20 1.536044 ##STR55##          H   H   1 4-Cl nD 20  1.538045 ##STR56##          H   H   1 4-Cl nD 20 1.545046 ##STR57##          H   H   1 4-Cl nD 20 1.555947 ##STR58##          H   H   1 2,4-Cl2                         nD 20 1.542248 ##STR59##          H   H   1 3,4-Cl2                         nD 20 1.542849 ##STR60##          H   H   1 2-CH3                         nD 20 1.530550 ##STR61##          H   H   1 3-NO2                         nD 20 1.543651 ##STR62##          H   H   1 4-OCH3                         nD 20 1.534352 ##STR63##          H   H   2 H    nD 20 1.544053 ##STR64##          H   H   1 4-Cl nD 20 1.587554 ##STR65##          H   H   1 4-Br nD 20 1.545055 ##STR66##          H   H   1 H    nD 20 1.565056 ##STR67##          H   H   1 2-Cl nD 20 1.571857 ##STR68##          H   H   1 H    m.p. 59-61� C.58 ##STR69##          H   CH3                  1 H    nD 20 1.571559 ##STR70##          H   H   2 H    nD 20 1.572160 ##STR71##          H   H   1 H    oil61 ##STR72##          H   H   1 3-NO2                         oil62 ##STR73##          H   H   1 2-F  m.p. 54-57� C.63 ##STR74##          H   H   1 2-Cl m.p. 64-66� C.64 ##STR75##          H   H   1 4-Cl nD 20 1.580365 ##STR76##          H   H   1 4-Cl oil66 ##STR77##          H   H   1 3-NO2                         nD 20 1.584567 ##STR78##          H   H   1 2-CH3                         m.p. 83-85� C.68 ##STR79##          H   H   1 2,4-Cl2                         oil69 ##STR80##          H   H   1 3,4-Cl2                         nD 20 1.590070 ##STR81##          H   H   1 2,6-Cl2                         nD 20 1.591571 ##STR82##          H   H   1 4-OCH3                         nD 20 1.573572 ##STR83##          H   H   1 4-Br nD 20 1.587073 ##STR84##          H   CH3                  1 H    nD 20 1.525474 ##STR85##          H   H   1 2-CH3                         nD 20 1.527375 ##STR86##          H   H   1 2-Cl nD 20 1.534976 ##STR87##          H   H   1 4-Br nD 20 1.544077 ##STR88##          H   H   1 3-NO2                         nD 20 1.542878 ##STR89##          H   H   1 2,4-Cl2                         nD 20 1.5424__________________________________________________________________________
Processes for the preparation of the novel intermediate compounds of formulae (III) and (VII) according to the present invention are illustrated by the following Examples.
EXAMPLE 79 ##STR90## (a compound of formula (III)).
15.2 g of 2-benzyloxyethanol and 10.6 g of triethylamine were dissolved in 150 ml of toluene, and the solution was cooled to -5� C. A solution of 21.6 g of 2-bromopropionylbromide in 30 ml of toluene was added dropwise thereto at -5� to 0� C. with stirring. The reaction mixture was further maintained at room temperature for two hours. The mixture was then washed successively with 1% strength by weight sodium hydroxide solution and water, and the toluene solution was then dried and filtered. The toluene was distilled off under reduced pressure, and the end product of 2-benzyloxyethyl-2-bromopropionate was obtained in a yield of 26.7 g (nD 20.5 1.5182)
The intermediate compounds of the general formula (III) of this invention shown in Table 6 were produced in a manner similar to that described above:
TABLE 6______________________________________ ##STR91##                    (III)Z1R1 R2               n      Xa Physical constant______________________________________Br   H       H      1      2-F     nD 20 1.5038Cl   H       H      1      4-F     nD 20 1.5004Br   H       H      1      4-F     nD 20 1.5040Br   H       H      1      2-Cl    nD 20.5 1.5302Br   H       H      1      4-Cl    nD 20 1.5289Cl   H       H      1      4-Br    nD 20.5 1.5321Br   H       H      1      4-Br    nD 20.5 1.5434Br   H       H      1      2-CH3                              nD 20 1.5186Br   H       H      1      2-OCH3                              nD 20.5 1.5260Br   H       H      1      3-NO2                              nD 20 1.5394Br   H       H      1      2,4-Cl2                              nD 20 1.5395Br   H       H      1      3,4-Cl2                              nD 20 1.5409Cl   H       H      1      2,6-Cl2                              nD 20 1.5412Br   CH3        H      1      H       nD 20.5 1.5100Br   H       CH3               1      H       nD 20.5 1.5116Br   H       H      2      H       nD 20.5 1.5130Br   H       H      1      4-OCH3                              nD 20.5 1.5250______________________________________
EXAMPLE 80 ##STR92## (a compound of formula (VII)).
12.1 g of hydroquinone were dissolved in 60 ml of dry dimethylformamide, 31.7 g of potassium carbonate were added thereto in a slow stream of nitrogen, and then the mixture was heated to 90� to 95� C. for one hour with stirring. The mixture was cooled to 60� C., and to it were added dropwise 28.7 g of 2-benzyloxyethyl-2-bromopropionate. The reaction mixture was heated at 90� C. for two hours. After cooling the reaction solution to room temperature, it was poured into ice-water and adjusted to pH7, then extracted with 100 ml of toluene. The toluene layer was dried and filtered, and then toluene was removed under reduced pressure. The colorless oily product of 2-benzyloxyethyl-2-(4-hydroxyphenoxy)propionate was obtained in a yield of 24.6 g. (nD 21.5 1.5390)
The intermediates compound of the general formula (VII) of this invention shown in Table 7 were produced in a manner similar to that described above:
TABLE 7______________________________________ ##STR93##                   (VII)M    R1 R2               n      Xa Physical constant______________________________________H    H       H      1      2-F     nD 21.5 1.5260H    H       H      1      4-Cl    nD 21.5 1.5473H    H       H      1      3,4-Cl2                              nD 21.5 1.5570H    CH3        H      1      H       nD 20.5 1.5321H    H       CH3               1      H       nD 20.5 1.5336H    H       H      2      H       nD 21.5 1.5344H    H       H      1      4-OCH3                              nD 20.5 1.5422______________________________________
Patent CitationsCited PatentFiling datePublication dateApplicantTitleDE2909816A1 *Mar 13, 1979Sep 27, 1979Ciba Geigy AgBis-pyridyloxy-phenoxy-propionsaeureesterFR2360253A1 * Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS4561882 *Apr 20, 1983Dec 31, 1985Zoecon CorporationHerbicidesUS4596599 *Dec 12, 1983Jun 24, 1986Bayer AktiengesellschaftOptically active phenoxypropionic acid derivativesUS4614536 *Sep 13, 1984Sep 30, 1986Nihon Tokushu Noyaku Seizo, K.K.Certain pyridyloxy-phenoxy-propionate derivatives, herbicidal compositions containing same and their herbicidal method of useUS4639537 *May 24, 1985Jan 27, 1987Bayer AktiengesellschaftCertain laevorotatory p-tolysulfonyl or methanesulfonyl propionic acid ester intermediatesUS4659370 *May 22, 1984Apr 21, 1987Nihon Tokushu Noyaku Seizo K.K.Substituted phenoxypropionates and herbicidal compositions containing same and their herbicidal useUS4661617 *Apr 19, 1985Apr 28, 1987Sandoz Ltd.PesticidesUS4717417 *Mar 14, 1986Jan 5, 1988Bayer AktiengesellschaftCertain 2-pyridyloxyphenoxypropanoic acid esters having herbicidal activityUS4740235 *Mar 26, 1986Apr 26, 1988Ciba-Geigy Corporation3-fluoropyridyl-2-oxy-phenoxy derivatives having herbicidal activityUS4894085 *Nov 29, 1988Jan 16, 1990The Dow Chemical CompanyGrasses, weeds* Cited by examinerClassifications U.S. Classification504/258, 546/300, 546/302, 560/21, 560/61, 546/301, 504/316, 546/297, 560/22, 560/62International ClassificationC07D213/643, C07D213/64Cooperative ClassificationC07D213/643European ClassificationC07D213/643Legal EventsDateCodeEventDescriptionJun 16, 1992FPExpired due to failure to pay maintenance feeEffective date: 19920412Apr 12, 1992LAPSLapse for failure to pay maintenance feesNov 12, 1991REMIMaintenance fee reminder mailedSep 21, 1987FPAYFee paymentYear of fee payment: 4Sep 18, 1984CCCertificate of correctionJun 17, 1982ASAssignmentOwner name: NIHON TOKUSHU NOYAKU SEIZO K.K. TOKYO, JAPAN, A COFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:AYA, MASAHIRO;SAITO, JUNICHI;YASUI, KAZUOMI;AND OTHERS;REEL/FRAME:004009/0212;SIGNING DATES FROM 19820520 TO 19820528RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services