Carbon-13 NMR spectroscopic study of the application of the "tool of increasing electron demand" to the 7-aryl-1-norbornenyl, 7-aryl-7-norbornyl, 2-aryl-2-bicyclo[2.1.1]hexyl, 1-aryl-1-cyclobutyl, and 3-aryl-3-nortricyclyl cations
Structural effects in solvolytic reactions. IX. Solvolysis of 3-aryl-3-nortricyclyl p-nitrobenzoates. Evidence for major increases in electron supply by the cyclopropyl group with increasing electron demand at the cationic center