Crystal structures of two bicyclo[5.1.0]octanes: potassiumtrans-bicyclo[5.1.0]octane-4-carboxylate monohydrate andcis-bicyclo[5.1.0]octan-4-yl 4-bromobenzenesulfonate

Abstract

The crystal structures of thetrans-fused compound potassiumtrans-bicyclo[5.1.0]octane-4-carboxylate monohydrate, K+·C9H13O2−·H2O, (I), and ofcis-bicyclo[5.1.0]octan-4-yl 4-bromobenzenesulfonate, C14H17BrO3S, (II), have been determined. Compound (I) represents the smallesttrans-fused cyclopropane structure known to date, and features the expectedshorteningof the bridging C—C bond relative to the other cyclopropane bond lengths, in contrast to thecis-fused system, (II), where all of the cyclopropane bond lengths are the same. The bicyclic ring system of (I) is disordered across a crystallographic mirror plane. The geometries of thecis-fused andtrans-fused ring systems are compared.