| 摘要 |
Process for preparing chlorinated ethylenic derivatives of the formula <IMAGE> (I) in which R1 represents acetyl, formyl optionally in the form of an acetal, hydroxy optionally as an ether or ester, alkyloxycarbonyl, alkyl of 1 to 12 carbon atoms substituted by one or more acetyl, formyl optionally in the form of an acetal, hydroxy optionally in the form of an ether or ester, or alkyloxycarbonyl, alkenyl of 2 to 12 carbon atoms containing one or more double bonds optionally substituted by one or more of acetyl, formyl optionally in the form of an acetal, hydroxy optionally in the form of an ether or ester, or alkyloxycarbonyl, or R1 represents 3-sulpholenyl or a radical of formula <IMAGE> (II) in which R2 denotes a hydrogen or acetyl, by reacting chlorine in a nonpolar aprotic solvent with a compound of general formula <IMAGE> (III) in which R1 is defined as above. The products of formula I, some of which are new, are useful as intermediates in the synthesis of terpene products such as vitamin E. |
