SCHEDULED MAINTENANCE
Successive metallation-metal hydride elimination reactions using equimolar mixtures of n-butyl lithium and potassium t-pentoxide have been used to synthesize resonance-stablized anions, including the methylenecycloheptatrienyl dianion. (III), which is indicated by simple molecular orbital arguments to be a stable species.
T. Clark and P. V. R. Schleyer, J. Chem. Soc., Chem. Commun., 1976, 798 DOI: 10.1039/C39760000798
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