SCHEDULED MAINTENANCE
A tricycloheptane product in cationic rearrangements
Abstract
The bicycloheptene 6 rearranged in acid to give the tricycloheptane 9, as shown by an X-ray crystal structure determination of the p-nitrobenzoate 10 derived from it. Earlier results in the literature had already indicated that this isomer was the thermodynamic sink. This apparently crowded structure, with its three contiguous quaternary centres, is, nevertheless, lower in energy than other accessible but less crowded structures, because of electronic stabilisation of the more substituted
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