Rd. Chambers et al., A NOVEL ANNELATION PROCESS INVOLVING PERFLUOROCYCLOALKENE DERIVATIVES, Journal of the Chemical Society, Chemical Communications, (10), 1993, pp. 856-857
N,N-Dimethylaniline and N-methylindole react as nucleophiles through c
arbon with perfluorobicyclobutylidene 1, to give the unusual products
5a and 5b; Proton Sponge reacts in an analgous way with the systems 2
and 3 but, in this case, give the novel annelated products 8 and 7.