Y. Dong-yuan
2009
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Journal
Chinese Journal of Pharmaceuticals
Abstract
Carpronium chloride was synthesized fromγ-butyrolactone by ring-opening and chlorination to give 4-chlorobutyryl chloride,which was subjected to esterification and quaterisation using alkali anion resin and KI as catalyst in an overall yield of 88.4%.Its ethyl ester analogue was prepared by the same way with an overall yield of 78.2%.