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:
Jan. 29, 2002
Filed:
Sep. 05, 2000
Frank Köster, Pforzheim, DE;
Eckhard Dinjus, Leimersheim, DE;
Forschungszentrum Karlsruhe, Karlsruhe, DE;
Abstract
A method for carboxylating terminal alkynes that have at least one additional aliphatic carbon atom in an &agr; position and that do not have a proton which has a higher acidity than that of the proton of the terminal triple bond. In an undivided electrolysis cell equipped with a cathode and an anode, a solution of the terminal alkyne in an aprotic solvent is acted upon by carbon dioxide at a pressure higher than atmospheric pressure. The invention provides a method in which carbon dioxide is selectively inserted between the terminal C—H bond, without disturbing the triple bond, and can be carried out without a catalyst or catalyst precursor.