X-Ray Diffraction Evidence for a Cyclohexatriene Motif in the Molecular Structure of Tris(bicyclo[2.1.1]hexeno)benzene: Bond Alternation after the Refutation of the Mills–Nixon Theory†
- †
This work was supported by the National Science Foundation (CHE-9307582, ASC-8902827), the Alfred P. Sloan Foundation (J. S. S), and the Schweizerischen Nationalfonds zur Förderung der wissenschaftlichen Forschung (H. B. B). The San Diego Supercomputer Center provided a grant for computing time.
Abstract

Cyclohexatriene lost, cyclohexatriene regained! Recently the Mills–Nixon postulate concerning the structure of benzene derivatives was recognized to be invalid. A new view on strain-induced bond localization in benzene led to the design and synthesis of tris(bicyclo[2.1.1]hexeno)benzene (1), which shows significant distortion toward a cyclohexatriene geometry.