The gas-phase basicities of 6-methylfulvene and 6,6-dimethylfulvene as determined by the thermokinetic method

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Eur. J. Mass Spectrom. 5, 441 - 447 (1999)

The gas-phase basicities of 6-methylfulvene and 6,6-dimethylfulvene as determined by the thermokinetic method

Michael Mormann and Jean-Yves Salpin
Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33501 Bielefeld,
Dietmar Kuck^*
Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33501 Bielefeld, , and Fachbereich für Chemie und Chemietechnik, Universität-Gesamthochschule Paderborn, Warburger Straße 100, D-33098 Paderborn,

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.

Keywords: fulvenes, fulvenium ions, protonated fulvene derivatives, gas-phase basicities, proton affinities, thermokinetic method

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