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The demethylation of coordinated hexamethylbenzene is integrated into [3 + 2] allyl/alkyne cycloaddition reactions mediated by (η 6 -hexamethylbenzene)Ru(η 3 -allyl)OTf. The reaction proceeds in high yield at or below room temperature and yields methane and (η 6 -pentamethylbenzene)ruthenium(1,2-dialkylcyclopentadienyl) + OTf - complexes exclusively. Cycloaddition with carbon−carbon bond activation is general for a range of disubstituted alkynes.
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Older et al. (1998) studied this question.
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