Dehydrohalogenation of a 7-halodihydrocodeinone dialkyl ketal
申请人:Macfarlan Smith Limited
公开号:US04025520A1
公开(公告)日:1977-05-24
A process for the dehydrohalogenation of a 7-halo- or a 1,7-dihalodihydrocodeinone dialkyl ketal of the general formula (I): ##STR1## in which R represents an alkyl group containing from 1 to 6 carbon atoms, X represents hydrogen or chlorine or bromine and Y represents chlorine or bromine which comprises subjecting the ketal to the action of a base in the presence of a polar aprotic solvent. The process has utility in facilitating the production of codeine.