Hydrochloric Acid → Cyclopropanecarboxylic acid, 3-(2,2-dichloroethenyl)-2,2-dimethyl-, methyl ester

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Reaction Steps

A mixture of 13.0 g (0.050 mol) of methyl 2,2-dimethyl-3-(2,2,2-trichloroethyl)cyclopropane-1-carboxylate (compound Z, C/T=77/23), 9.12 g (0.060 mol) of 1,5-diazabicyclo[5.4.0]undec-5-ene and 50 ml of dimethylformamide was stirred at 100° for 1 hour, then allowed to cool to room temperature and poured into 1 N hydrochloric acid. The mixture was extracted with ether and the ether extracts were combined, washed with brine, dried over magnesium sulfate and concentrated to give 10.15 g (91% yield) of methyl 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxylate, 94% purity, C/T=76/24.

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