Abstract
The gas-phase basicities (GB) of 6-methylfulvene and 6,6-dimethylfulvene have been determined by Fourier transform ion cyclotron resonance spectrometry using the thermokinetic method. Proton affinities (PA) and heats of formation derived from the GB values reveal the relatively high thermochemical stability of fulvenium ions which, in line with the previous studies on the parent C6H6 species, is only c. 40–50 kJ mol−1 less than those of the most stable protonated forms of the isomeric alkylbenzenes.
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