Improved preparations of cyclo-octane-1,5-dione and 1,5-dimethlenecyclo-octane are described. The diene reacts with bromine and strong acids to give 1,5-disubstituted derivatives of bicyclo[3.3.1]nonane in high yield; contrary to an earlier report, the bicyclo[3.3.2.]decane skeleton is not formed in the latter case.
R. Bishop, J. Chem. Soc., Perkin Trans. 1, 1974, 2364 DOI: 10.1039/P19740002364
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