A rare example of a rearrangement involving four structural isomers: α-Phosphinonitrile/c-phosphinoketenimine/ 1-Aza-4-phosphabutadiene/1,2-dihydro-1,2-azaphosphete

Article abstract of DOI:10.1002/1521-3765(20021202)8:23<5305::AID-CHEM5305>3.0.CO;2-6

The stable compound [bis(dicyclohexylamino)phosphino](trimethylsilyl)carbene (1) reacts with dimethyl cyanamide to afford the original 1,2-dihydro-1,2- azaphosphete 4a (51% yield). The surprising formation of this heterocycle involves the transient format