Patent ID: 6844288
Filing Date: 2005-01-18
Classification: C07C,C08F,C08L,Y10S

Abstract:
1. A process for the preparation of a compound of formula (II): wherein substituents R1 are hydrogen atoms; the R the R the R the R and/or its double bond isomers comprising the following steps: a) contacting a compound of formula (III): and/or its double bound isomer with a base selected from the group consisting of alkali and earth alkali metal hydroxides or alkoxides in the presence of dimethylsulfoxide or 1-Me-2-pyrrolidinone, thereby forming a corresponding anionic form of formula (III); b) treating the corresponding anionic form of formula (III) with a compound of general formula R c) contacting the compound of formula (IV) with a base, wherein the molar ratio between the base and the compound of formula (IV) is equal to or greater than 2, thereby forming a corresponding di-anionic form of formula (IV); d) treating the corresponding di-anionic form of formula (IV) with a compound of formula (V) CHR