Derivatives of the cationic tropylium annulated imidazolylidene ITrop+ are obtained by hydride abstraction from related cycloheptatriene compounds. Spectroscopic, structural and theoretical data indicate that, as a cationic relative of benzimidazolylidenes, ITrop+ has highly reduced σ-donor and strong π-acceptor character.
S. Appel, P. Brüggemann and C. Ganter, Chem. Commun., 2020, 56, 9020 DOI: 10.1039/D0CC04482B
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