| 摘要 |
PURPOSE:To produce the titled compound from an inexpensive raw material, with simple operation, in an improved yield, by halogenating a cyclic ketone via specific steps such as a synthesizing step, separation of an organic phase from an aqueous phase, the ring-shrinkage of the intermediate product, etc. CONSTITUTION:The titled compound can be produced by (1) halogenating the cyclic ketone such as cyclopentanone with preferably chlorine in the presence of water to obtain 2-halogenoxycloalkanone, (2) separating the reaction liquid of the step (1) into the organic phase and the aqueous phase, (3) contacting the organic phase containing 2-halogenocycloalkanone and separated in the step (2) with astrong inorganic base, preferably in alkali metal hydroxide to effect the shrinkage of the ring to obtain a cycloalkanecarboxylic acid salt having smaller number of ring member than the cyclic ketone by one, and (4) optionally hydrolyzing the cycloalkanecarboxylic acid salt produced in the step (3).
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