Showa Chemical Co., Ltd.

Osaka Municipal Government

Nippon Peroxide Co., Ltd.

Yoshikazu Yamamoto

Tsuneaki Hirashima

Ryuichi Kayama

Toshiyuki Miyata

Minoru Saotome

Mitsuyuki Kato

Nobuo Watani

A method of producing aminobenzimidazolones which comprises reacting a compound I having the general formula ##STR1## wherein X, Y and Z independently represent a substituent selected from the group consisting of a nitro group and an amino group, with carbon monoxide in solvent in the presence of selenium and an inorganic base or an organic base, and in the presence of water when the compound I has nitro groups, thereby providing a compound II having the general formula ##STR2##

Method of producing aminobenzimidazolones

An optically active enantiomer of tartaric acid or a salt thereof is racemized by mixing meso-tartaric acid or a salt thereof with a solution of an optically active enantiomer of tartaric acid or a salt thereof in a molar ratio of 0.2 - 0.5 and thereafter heating the mixture.

Racemization of optically active tartaric acid

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Ikeda, Japan

Yoshikazu Yamamoto