| 摘要 |
PURPOSE:To obtain the titled substance which is a synthetic intermediate for pyrethroid based insecticides and acaricides, e.g. fenpropathrin, safely and advantageously using raw materials available at a low cost, by reacting a novel halogenoketone compound as a starting material with an alkali hydroxide. CONSTITUTION:A novel halogenoketone compound expressed by formula I (X is C1 or Br) is reacted with an alkali hydroxide, preferably in an amount within 2-15 mol range based on one mol compound expressed by formula I in a solvent, e.g. methanol or water, at 20-100 deg.C to give the aimed compound. The compound expressed by formula I is synthesized by reacting 2,3-dimethyl-2- butene expressed by formula II with acetyl chloride in the presence of a Lewis acid, and halogenating the resultant compound expressed by formula III.
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