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Mayr, Herbert and Bäuml, Englbert (1984): [2+2]-cycloadditions of alkenes with the triphenylallenyl cation. In: Tetrahedron Letters, Vol. 25, No. 11: pp. 1127-1130
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Abstract

The triphenylallenyl cation (8), generated from triphenylpropynol (7) and FSO3H, reacts with alkenes to give the allyl cations 12, which may be deprotonated to yield the methyleneccylobutenes 14. Alternatively, 12 can be converted into the 2-vinyl-indenes 13 two subsequent electrocyclic reactions.