Stable carbocations. 210. .sigma.-Bond bridged carbonium ions. 8. The chemistry of protoadamantane. 7. Rapidly equilibrating unsymmetrically bridged 1,3,5,7-tetramethyl- and rapidly equilibrating trivalent 1,2,3,5,7-pentamethyl-2-adamantyl cations. Addivity of carbon-13 NMR chemical shifts relating the classical vs. nonclassical nature of carbocations

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