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:
Nov. 09, 1993
Filed:
Jul. 30, 1992
Yoshitaka Nishida, Ehime, JP;
Tamio Shirafuji, Ehime, JP;
Kiyomi Sakai, Ehime, JP;
Kensen Okusako, Ehime, JP;
Sumitomo Chemical Co., Ltd., Osaka, JP;
Abstract
A process for producing coumarin and a derivative thereof represented by formula (2): ##STR1## wherein R.sub.1 to R.sub.4 each represents a hydrogen atom, a methyl group, or an ethyl group, provided that at least two of R.sub.1 to R.sub.4 each represents a hydrogen atom, the process comprising the step of heating a 3-(2-cyclohexanoyl)propionic acid ester represented by formula (1): ##STR2## wherein R.sub.1 to R.sub.4 are as defined above and R.sub.5 represents an alkyl group having from 1 to 4 carbon atoms, in the presence of a palladium catalyst, thereby to allow the ester of formula (1) to undergo cyclization and dehydrogenation reactions, the latter stage of the reactions, in which the conversion of the 3-(2-cyclohexanoyl) propionic acid ester used as a starting material has reached about 80% or more, being conducted at a higher temperature than that for the former stage of the reactions.