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:
Feb. 19, 1980
Filed:
May. 02, 1977
Verlan H VanRheenen, Portage, MI (US);
The Upjohn Company, Kalamazoo, MI (US);
Abstract
2-Aryl-C.sub.2 to C.sub.5 -alkanoic acids and esters thereof are prepared by heating a 2-(2-oxo-3-cyclohexenyl)-alkanoic acid or ester derivative in the presence of a sulfonic acid or a phosphonic acid at 75.degree. C. to 130.degree. C. while providing a means for removing water from the reaction mixture. In the process new butenolide derivative intermediates have been discovered. Alternatively, the 2-aryl-C.sub.2 to C.sub.6 -alkanoic acids can be prepared from the butenolides by forming a mixture of the 2-(2-oxo-3-cyclohexenyl)-alkanoic acid with acetic anhydride in the presence of an acid scavenging base, allowing the mixture to stand for a time sufficient to form an acetate intermediate, heating the resulting mixture to about 75.degree. C. to about 130.degree. C. to form the betenolide intermediates. Thereafter these intermediates can be heated with sulfonic or phosphonic acid as above while removing water to form the 2-aryl-C.sub.2 to C.sub.6 -alkanoic acid or adding a carboxylic acyl halide and water to form acetic acid and mineral acid in the mixture, and this resulting mixture can be heated to 75.degree. C. to 130.degree. C. for a time sufficient to form 2-aryl-C.sub.2 to C.sub.6 -alkanoic acid products which have a variety of uses.