MANUFACTURE OF HERBICIDAL AND PLANT GROWTH REGULANT CYCLOHEXANEDIONECARBOXYLIC ACID DERIVATIVE, PRODUCT AND COMPOSITION

Japanese Patent JPS6187642

A

The present invention relates to a novel, optimized process for the preparation of cyclohexanedionecarboxylic acid derivatives of formula I which can be carried out in a single vessel affording a very good yield, which process comprises heating a reactive carboxylic acid derivative of formula III (III) wherein X is a halide, an alkylsulfonic or arylsulfonic acid radical or the molecular radical which is necessary to form an anhydride and R1 is alkyl or cycloalkyl, with an alkali metal cyanide or copper cyanide, in an inert organic solvent, to give a mixture, then adding in succession to said mixture, at a temperature in the range from 0 DEG C. to room temperature, zinc chloride, an equimolar amount, with respect to the carboxylic acid derivative of formula III, of a 3,5-cyclohexanedione-1-carboxylic acid derivative of formula II (II) wherein A is an ester or amide radical, and, dropwise, an amine, and, after acidifying the reaction mixture with an aqueous acid, isolating the resultant 4-acyl-3,5-cyclohexanedione-1-carboxylic acid derivative of formula I (I) +TR by extraction. Said cyclohexanedionecarboxylic acid derivatives have herbicidal and plant growth regulating properties.

HANSU GEOROGU BURUNNAA
URUSU MIYURAA

JP21998485A

May 06, 1986

October 02, 1985

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CIBA GEIGY AG

A01N37/42; C07C51/00; C07C51/347; C07C62/00; C07C62/38; C07C67/00; C07C67/22; C07C69/757; C07C201/00; C07C205/43; C07C231/00; C07C231/12; C07C233/12; C07C235/82; C07C253/00; C07C255/55; C07C255/60; C07C313/00; C07C323/12; C07C323/40; C07D295/18; C07D295/185; (IPC1-7): C07C62/38; A01N37/42; A01N43/36; A01N43/40; A01N43/84; C07C69/757; C07C79/22; C07C103/19; C07C103/737; C07C121/75; C07C121/78; C07C149/18; C07C149/20; C07C149/24; C07D295/18

Kaname Yumi

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