Crystal structures of two bicyclo[5.1.0]octanes: potassium trans-bicyclo[5.1.0]octane-4-carboxylate monohydrate and cis-bicyclo[5.1.0]octan-4-yl 4-bromobenzenesulfonate
2017
The crystal structures of the trans-fused compound potassium trans-bicyclo[5.1.0]octane-4-carboxylate monohydrate, K+·C9H13O2−·H2O, (I), and of cis-bicyclo[5.1.0]octan-4-yl 4-bromobenzenesulfonate, C14H17BrO3S, (II), have been determined. Compound (I) represents the smallest trans-fused cyclopropane structure known to date, and features the expected shortening of the bridging C—C bond relative to the other cyclopropane bond lengths, in contrast to the cis-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 the cis-fused and trans-fused ring systems are compared.
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