Borylated methylenephosphonium salts: precursors of elusive boryl(phosphino)carbenes.
The synthesis of a new family of boryl-substituted methylenephosphonium derivatives, the phosphorus analogues of iminium salts, has been developed. They were used in the preparation of the first stable boryl(phosphino)carbene, which has been fully characterized by NMR spectroscopy and X-ray crystallography. Density functional theory calculations indicate that these carbenes can be classified as push-pull carbenes with a relatively small singlet-triplet energy gap.
Lavigne
Florie
F
Université de Toulouse, UPS, and CNRS, LHFA, 118 route de Narbonne, F-31062 Toulouse, France.
Maerten
Eddy
E
Alcaraz
Gilles
G
Saffon-Merceron
Nathalie
N
Acosta-Silva
Carles
C
Branchadell
Vicenç
V
Baceiredo
Antoine
A