Patent ID: 8519195
Filing Date: 2013-08-27
Classification: C07C

Abstract:
1. A process for preparing an alkenone corresponding to Formula (I): R1—C(O)—C(H)═C(H)—OR2 (I) wherein R1 is a fluorinated C1-C4 alkyl group or a CF3C(O)CH2 group, wherein R2 represents aryl, substituted aryl, or a C1-C10 alkyl group which is optionally substituted by at least one halogen atom, said process comprising: (a) reacting a carboxylic acid halide with a vinyl ether by introducing vinyl ether into a liquid reaction medium containing the carboxylic acid halide to form a halogenated precursor of the alkenone; and (b) eliminating hydrogen halide from said precursor to form the alkenone, wherein said liquid reaction medium consists essentially of said carboxylic acid halide or comprises said carboxylic acid halide and a solvent; wherein said carboxylic acid halide corresponds to Formula (II): R1—C(O)X (II) in which X represents fluorine, chlorine, or bromine, and wherein said vinyl ether corresponds to Formula (III): CH2═C(H)—OR2 (III) in which R2 has the same meaning as for Formula (I).