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.
Université de Toulouse, UPS, and CNRS, LHFA, 118 route de Narbonne, F-31062 Toulouse, France.
Florie
F
Lavigne
Eddy
E
Maerten
Gilles
G
Alcaraz
Nathalie
N
Saffon-Merceron
Carles
C
Acosta-Silva
Vicenç
V
Branchadell
Antoine
A
Baceiredo