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:
Mar. 26, 2002
Filed:
Nov. 10, 2000
Dale Robert Coulson, Wilmington, DE (US);
David L. Thorn, West Chester, PA (US);
Mark A. Scialdone, Oxford, PA (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
This invention pertains to a process for making &agr;-methylene-&ggr;-butyrolactone by acid-catalyzed rearrangement of tetrahydro-3-furoic acid. In a further embodiment, when tetrahydro-3-furoic acid is treated with acetic anhydride and an acid catalyst, &agr;-acetoxymethyl-&ggr;-butyrolactone is produced in high yield. Under basic conditions, &agr;-acetoxymethyl-&ggr;-butyrolactone can readily form&agr;-methylene-&ggr;-butyrolactone by the elimination of acetic acid. These reactions provide &agr;-methylene-&ggr;-butyrolactone by novel routes which do not require butyrolactone or formaldehyde.