title: A rare example of a rearrangement involving four structural isomers: alpha-phosphinonitrile/C-phosphinoketenimine/1-aza-4- phosphabutadiene/1,2-dihydro-1,2-azaphosphete.
abstract: 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 formation of a nitrile, a keteneimine, and a 1-aza-4 lambda 3-phosphabutadiene derivative. By using substituent effects and different synthetic routes, all of these structural isomers have been isolated.
authors.affiliation: Laboratoire Hétérochimie Fondamentale et Appliquée, UMR 5069, Université Paul Sabatier 118 Route de Narbonne, 31062 Toulouse, France.
authors.forename: Déborah
authors.initials: D
authors.lastname: Amsallem
authors.forename: Stéphane
authors.initials: S
authors.lastname: Mazières
authors.forename: Valérie
authors.initials: V
authors.lastname: Piquet-Fauré
authors.forename: Heinz
authors.initials: H
authors.lastname: Gornitzka
authors.forename: Antoine
authors.initials: A
authors.lastname: Baceiredo
authors.forename: Guy
authors.initials: G
authors.lastname: Bertrand