Sumitomo Seika Chemicals Co., Ltd.

Yoshihide Masuda

Hiroshi Goda

Satoshi Kimura

Naohiro Yoshikawa

Nario Kimura

Masaki Teramoto

Yuuji Matuzaki

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

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Hyogo, Japan

Yoshihide Masuda