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:
Sep. 01, 1981
Filed:
Jul. 24, 1979
Montedison, S.p.A., Milan, IT;
Abstract
A process is disclosed for preparing alpha-thienylacetic acid, alkyl esters and salts thereof by carbonylation of 2-chloromethylthiophene, characterized in that 2-chloromethylthiophene and carbon monoxide are reacted under atmospheric pressure and at a temperature ranging from 0.degree. to 60.degree. C., in an aqueous-alcoholic solution in the presence of a catalyst selected from the class consisting of Co.sub.2 (CO).sub.8, MCo(CO).sub.4 where M is selected from the class consisting of Na and K, and a system comprising a cobalt salt (such as cobaltous chloride), a ferro-manganese alloy and at least one sulphur-containing promoter (such as the alkaline sulphides and thiosulphates), and in the presence of an inorganic base, and the separating the alpha-thienylacetic acid from the resulting salt and/or ester obtained.