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Abstract
The reactions of 1-methyl and 1-phenyl-Δ3-phospholenes with sulphenate esters give rise to a range of products involving rearrangement of the endocyclic double bond, dealkylation to phospholene oxides and fragmentation of the ring. When reacted with N,N-diethyl methylsulphenamide, the same phospholenes give ylids by loss of a proton from position-2 or 5 of an intermediate phospholenium amide.