Sumitomo Seika Chemicals Co., Ltd.

Masaki Teramoto

Hiroshi Goda

Satoshi Kimura

Nario Kimura

Naohiro Yoshikawa

Yuuji Matuzaki

Yoshihide Masuda

Shinji Kobayashi

Kenji Wada

Hirokazu Kagano

Michio Suzuki

Hiroyuki Hata

Makoto Katou

Masahito Nakano

Toshiyuki Ohe

Masato Yoshikawa

Tohru Ido

A method of producing a dibenzoxazolyl thiophene represented by the formula ##STR1## wherein R'' represents a hydrogen, an alkyl of 1-8 carbons, a cycloalkyl, a phenyl, a substituted phenyl or a benzyl, which includes: reacting a thiophene-2,5-dicarboxylic acid diester represented by the formula ##STR2## wherein R' represents a branched alkyl of 3-5 carbons, phenyl, or tolyl, with an aminophenol represented by the formula ##STR3## wherein R'' is the same as before, in the presence of an acid catalyst, wherein the acid catalyst is boric acid, phosphoric acid, polyphosphoric acid, zinc chloride, ferric chloride, or sulfuric acid.

Production of thiophene-2,5-dicarboxylic acid diesters,

There is disclosed a method of producing a thiophene-2,5-dicarboxylic acid diester represented by the formula ##STR1## wherein R' represents an alkyl of 1-8 carbons, a phenyl, a substituted phenyl or benzyl, which comprises:

Production of dibenzoxazolylthiophenes

The present invention is directed to a method for producing dichlorophenylthioglycolic acid which comprises reacting monobromodichlorobenzene or trichlorobenzene with a thioglycolate in a ratio of 0.5 to 2.5 mols of the latter to 1 mol of the former in a polar solvent, and to a method for producing dichlorophenylthioglycolic acid comprising further reacting the reaction mixture obtained as above with a monohalogenoacetate. The method of the present invention is very useful industrially, advantageously producing dichlorophenylthioglycolic acid in high yield.

Method for producing dichlorophenylthioglycolic acid

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Hyogo, Japan

Masaki Teramoto