| 摘要 |
Process for the preparation of halogenoacetals of the general formula: <IMAGE> wherein X represents chlorine or bromine, the symbols R each represent a linear or branched alkyl radical (1 to 6 carbon atoms) or together form a linear or branched alkylene radical (2 to 6 carbon atoms), and the symbols R1 and R2, which are identical or different, represent a hydrogen atom or an alkyl radical (1 to 6 carbon atoms), by reaction of chlorine or bromine with a beta , gamma -ethylenic aldehyde, in the presence of a tertiary amide, followed by reaction with a primary or secondary aliphatic alcohol, a diol (preferably a glycol) or an alkyl orthoformate. |
