1-Aza-3,4-diptiospholenes by [3 + 2] cycloaddition of 2-(diisopropylamino)phosphaethyne to diazo derivatives R1R2C=N2

Article abstract of DOI:10.1002/cber.19961291020

The reaction of the (diisopropylamino)phosphaethyne (1) with diazo compounds of the type R¹R²C=N₂ (2a-2c) unexpectedly leads in high yields (60-90%) to the 1-aza-3,4-diphospholene derivatives 3a-3c, a new class of heterocycles. NMR investigations of the analogous reaction of 1 with diazocyclopentadiene 2d show that the multi-step formation of 3a-3c proceeds via the 1-aza-3,4-diphospholes 6a-6d as intermediates. VCH Verlagsgesellschaft mbH, 1996.