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:
Apr. 25, 2000
Filed:
Mar. 17, 1999
Applicant:
Inventors:
Mitsuru Ohno, Tsukuba, JP;
Shuichi Yamagiwa, Matsudo, JP;
Assignee:
Daicel Chemical Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
549228 ; 549229 ; 549230 ;
Abstract
Reacting a diol (1) with a carbonic ester (2) to produce a cyclic carbonic ester (3) using a salt of a weak acid with an alkaline metal or alkaline earth metal as a catalyst. The diol (1) contains diols having an asymmetric carbon atom. The reaction mixture is neutralized and distilled to obtain a cyclic carbonic ester. Cyclic carbonic esters are produced using an easily accessible and easy to handle reactant, with good yield and under mild and moderate conditions. ##STR1##