Crystal and molecular structure of trans-2,trans-3-dimethylcyclopro-panecarboxylic acid

Abstract

Single-crystal X-ray analysis of the title compound has established its constitution and molecular dimensions. Crystals are monoclinic, space group P2₁/c, with Z= 4, in a cell of dimensions: a= 6·39, b= 10·98, c= 9·76 Å, β= 105·6°. The structure was solved by direct phase-determining methods and refined by full-matrix least-squares calculations to R 0·085 over 638 reflections. The crystals contain centrosymmetric hydrogen-bonded dimers with a conformation in which the CO bond points over the cyclopropane ring.