3-Substituted-2-halocycloheptenone compounds and a method for manufacturing same
 The present invention relates to compounds of formula (1). ##STR1## wherein: R.sub.1 is hydrogen atom or lower alkyl group, X is bromine atom or chlorine atom; and which are useful for the preparation of the cycloheptanoides such as cycloheptimidazole derivatives. The compound having formula (1) is obtained in a single pot by the reaction of a trialkylsilylether compound with a dihalocarbene which, in turn, is prepared from the reaction of chloroform or bromoform in the presence of base. 
Kotobuki Pharmaceutical CO LTD
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Tsuyoshi Akira Naoto Akira
Tomiyama Tomiyama Ueyama Ohno