A stereoselective route from a dihydro-1,2,4λ3-diazaphosphole to a λ3-phosphirane via a bismethylenephosphorane intermediate
Abstract
The dihydro-1,2,4λ3-diazaphosphole (3) decomposes stereoselectively to the bismethylenephosphorane (4), which then undergoes conrotatory ring closure to the λ3-phosphirane (6), by a route controlled entirely by orbital symmetry.