title: Crystalline, Lewis base-free, cationic phosphoranimines (iminophosphonium salts).
abstract: Cationic phosphoranimines have been postulated as intermediates in phosphazene polymerization chemistry. However, the high electrophilicity of the phosphorus center has so far prevented their characterization. Here, we report the synthesis of two Lewis base-free iminophosphonium salts, obtained by reaction of a stable phosphinonitrene with methyl trifluoromethanesulfonate and trifluoromethanesulfonic acid. These cationic species were characterized by NMR spectroscopy and single-crystal X-ray diffraction analysis. Using 4-(dimethylamino)pyridine, a corresponding Lewis-base adduct has also been isolated.
authors.affiliation: UCSD-CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California-San Diego , La Jolla, California 92093-0343, United States.
authors.forename: Fabian
authors.initials: F
authors.lastname: Dielmann
authors.forename: Curtis E
authors.initials: CE
authors.lastname: Moore
authors.forename: Arnold L
authors.initials: AL
authors.lastname: Rheingold
authors.forename: Guy
authors.initials: G
authors.lastname: Bertrand