The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 1994
Filed:
Jan. 19, 1993
Hiroshi Goda, Hyogo, JP;
Nario Kimura, Hyogo, JP;
Satoshi Kimura, Hyogo, JP;
Naohiro Yoshikawa, Hyogo, JP;
Masaki Teramoto, Hyogo, JP;
Yoshihide Masuda, Hyogo, JP;
Yuuji Matuzaki, Hyogo, JP;
Sumitomo Seika Chemicals Co., Ltd., Hyogo, JP;
Abstract
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.