A Bicyclic Cyclopropane Carboxylic Acid Lactone from a Solid-Liquid PTC Reaction

The structure of 6,6-dimethyl-4-trichloromethyl-3-oxa-bicyclo[3.1.0]hexan-2-one-1-carboxylic acid ethyl ester (C₁₁H₁₃Cl₃O₄), a potential pyrethroid-type intermediate, is presented. It is dominated by the interplanar angle [70.1 (3)°] formed by the lactone and the cyclopropane rings of the molecule. A structural comparison with other related published structures is also presented.

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