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. 01, 1977
Filed:
Apr. 26, 1976
Francois A Lavallee, Willoughby Hills, OH (US);
General Electric Company, Schenectady, NY (US);
Abstract
This invention relates to a method for preparation of a stereo isomer mixture of crystalline alpha-cyanoethylphthalate wherein the stereo isomer mixture is separated from the reaction mixture by precipitation. More particularly, the stereo isomer mixture is initially formed by reacting lactonitrile and a phthalic acid halide in an organic liquid solution at ambient conditions and the stereo isomer mixture precipitated therefrom by adding an organic precipitant liquid to the reaction mixture. By-products and side-reaction products can be washed from the reaction mixture prior to precipitation of the stereo isomer mixture to provide an alpha-cyanoethylphthalate product having greater purity than conventionally obtained. Additionally, the present alpha-cyanoethylphthalate composition can be characterized as a mixture of the meso and dl isomers wherein one isomer has a predominant weight ratio in the mixture.