Reaction of 7-substituted cycloheptatrienes with either hexacarbonylchromium or with tricarbonyltripyridine-chromium leads to the corresponding 7-endo-substituted tricarbonylcycloheptatrienechromiums, either exclusively or, in only two of the cases studied, mixed with the exo-isomer. Some new observations on the ring-contraction of such complexes are reported.
P. L. Pauson, G. H. Smith and J. H. Valentine, J. Chem. Soc. C, 1967, 1061 DOI: 10.1039/J39670001061
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