PROCESS FOR THE PREPARATION OF ALKYLATED CYCLOPENTENONES, AND ACETYLENIC ESTERS USEFUL AS STARTING COMPOUNDS IN SAID PREPARATION

摘要

Cyclopentenones of formula (I) wherein each of symbols R1 and R2, when taken separately, represents an alkyl radical of C1 to C6, or a hydrogen atom, or, when taken together, they represent a polymethylene, or one of them designates a hydrogen atom and the other an alkyl radical of C1 to C6, are prepared starting from compounds having formula (II) wherein R stands for a C1 to C6 alkyl radical or a phenyl group, via a catalytic reaction promoted by a metallo-organic compound of formula MeX2(R3CN)2 (III) wherein Me represents palladium or platinum, R3 represents a C1 to C3 alkyl radical or a phenyl group and X defines a halogen atom.