Abstract
The reactions of diethyl pentafluorophenylphosphonite and ethyl bis(pentafluorophenyl)phosphinite with activated alkynes proceed as two-stage cycloaddition processes and lead to formation of sufficiently stable heterocyclic fused fluorophosphoranes. Hydrolysis of the latter is accompanied by cleavage of the exocyclic P-O bond and formation of substituted 4,5,6,7-tetrafluorobenzo[d]-λ5-phospholes, previously uknown bicyclic phosphorus-containing compounds.
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