Osaka Municipal Government

Showa Chemical Co., Ltd.

Toshiyuki Miyata

Tsuneaki Hirashima

Yoshikazu Yamamoto

Mitsuyuki Kato

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

A method of producing benzimidazolone which comprises reacting a feed compound having the general formula ##STR1## wherein X and Y independently represent an amino group or a nitro group, with carbon monoxide in solvent in the presence of selenium and a base, and in the presence of water when the feed compound has nitro groups.

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Sakai, Japan

Toshiyuki Miyata