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Patent Searching and Data


Title:
PREPARATION OF M-PHENOXYBENZOIC ACID
Document Type and Number:
Japanese Patent JPS5566539
Kind Code:
A
Abstract:

PURPOSE: To obtain the title compound useful as an intermediate of pyrethroid insecticides industrially advantageously, by catalytic oxidation of metaphenoxytoluene in a specific solvent in the presence of cobalt bromoacetate as a catalyst, and by recycling the catalyst and solvent in the reaction process.

CONSTITUTION: m-Phenoxytoluene is oxidized with oxygen or a gas comprising oxygen e.g. air, in a solution of cobalt bromoacetate in a lower fatty acid. The reaction liquid thus obtained is cooled at 60°C or below, and the deposited crystals of m-phenoxybenzoic acid are separated. The remaining mother liquor is distilled by adding an organic solvent capable of forming an azeotropic mixture with water, preferably benzene, to have 4% of water or less, and recycled in the oxidation step mentioned above. This catalyst has advantages of rapid oxidation of said raw material without a reaction initiator and a co-catalyst, and of repeated use in a simple treatment.


Inventors:
KATOU KINHEI
KANEHARA YOSHIKANE
ARIIZUMI AKIRA
Application Number:
JP1978000139722
Publication Date:
May 20, 1980
Filing Date:
November 13, 1978
Export Citation:
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Assignee:
NIPPON SODA CO
International Classes:
C07C65/21; B01J31/00; B01J31/04; C07B61/00; C07C51/00; C07C51/265; C07C67/00; (IPC1-7): B01J31/04; C07C51/265; C07C65/21