Synthesis of P2C2O2 and P2CO via NHC-mediated coupling of the phosphaethynolate anion†
Robert J.
Gilliard, Jr., 
ab
Riccardo
Suter,
b
Erik
Schrader,
b
Zoltán
Benkő,
c
Arnold L.
Rheingold,
d
Hansjörg
Grützmacher
*b
and
John D.
Protasiewicz
*a
ab
Riccardo
Suter,
b
Erik
Schrader,
b
Zoltán
Benkő,
c
Arnold L.
Rheingold,
d
Hansjörg
Grützmacher
*b
and
John D.
Protasiewicz
*a
Abstract
The reaction of the chloroimidazolium chloride salt, [NHC-Cl][Cl], NHC = C{N(2,6-iPr2C6H3)CH}2 (1) with two equivalents of sodium phosphaethynolate, Na[OCP]·(dioxane)2.5, results in the formation of NHC-{cyclo-(CO)-P2-C(O)} (2) and NHC-P2-C(O)-NHC (3). Notably, in the presence of free NHC ligand, compound 2 converts to compound 3via extrusion of CO at elevated temperatures. The nature of the bonding in these complexes was probed computationally and spectroscopically.
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