Synthesis, Structure and Reactivity of a Cyapho‐Cyanamide Salt

Abstract

We describe a facile synthesis of the cyaphocyanamide salt [Na(18-crown-6)][N(CN)(CP)] from reaction of [Na(18-crown-6)][PH 2 ] (18-crown-6 = 1,4,7,10,13,16-hexaoxacyclooctadecane) with dimethyl N-cyanocarbonimidate, (MeO) 2 C=N(CN). The reaction proceeds with elimination of two equivalents of methanol. Careful tuning of the reaction conditions allowed for the isolation and characterization of the N-cyano(carboximidate)phosphide intermediate [HP{C-(OMe)N(CN)}] À . Due to the adverse effects of methanol in these reaction mixtures, a bulk scale synthesis of [Na(18crown-6)][N(CN)(CP)] could be achieved by addition of a base (LiHMDS) to neutralize the resulting alcohol. Further reactivity studies of this anion reveal that functionalization at the phosphorus atom is viable to yield a new family of cyanidefunctionalised phosphorus heterocycles. Scheme 1. Formation of ions 1 and 2 from reaction of NaPH 2 with dimethyl cyanocarbonimidate.