Abstract
The synthesis and X-ray crystal structure of the p-bromoanilide derivative of bicyclo[2.2.0]hexane-l-carboxylic acid (1), N-(4-bromophenyl)-bicyclo[2.2.0]hexane-l-carboxamide (2), is reported. N-(4-Bromophenyl)-bicyclo[2.2.0]hexane-l-carboxamide is synthesized in good yield via the DCC coupling of bicyclo[2.2.0]hexane-l-carboxylic acid (1) with p-bromoaniline. Low-temperature X-ray analysis of 2 reveals that the \(C{\kern 1pt} ---{\kern 1pt} C\) bonds of the bicyclo[2.2.0]hexane skeleton vicinal to the amide group show a slight lengthening due to conjugative interaction with the π-accepting amide group. Ab initio calculations at the 6-31G* level of theory on bicyclo[2.2.0]hexane-l-carboxamide, a model for 2, and for other 1-substituted bicyclo[2.2.0]hexanes are also reported.
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Forman, M.A., Zanoni, B.C., Chopko, E.C. et al. Molecular Structure of 1-Substituted Bicyclo[2.2.0]hexanes: A Combined X-Ray Structural and Ab Initio Study. Structural Chemistry 9, 27–32 (1998). https://doi.org/10.1023/A:1022431514386
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DOI: https://doi.org/10.1023/A:1022431514386