ISSN:
1434-1948
Keywords:
Carbene complexes
;
Tungsten
;
Phosphorus
;
2H-Azaphosphirene complexes
;
Cyclization
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The first syntheses of pentacarbonyl[2-(pentamethyl-2,4-cyclopentadien-1-yl)-2H-azaphosphirene]tungsten complexes are reported, using a one-pot reaction of dichloro(pentamethyl-2,4-cyclopentadien-1-yl)phosphane (Cp*PCl2) with triethylamine and {[amino(aryl)carbene]pentcarbonyltungsten(0)}. [Pentamethyl-2,4-cyclopentadien-1-yl]phosphanediyl-bridged dinuclear carbene complexes are formed as long-lived intermediates, which, by elimination and rearrangement reactions, led to the final products. If traces of water were present, then by-products were formed; in one case, a dinuclear carbene complex with a P(Cp*)-O-P(Cp*) bridging unit was isolated. Under ordinary reaction conditions 2H-azaphosphirene complexes are slowly transformed into {pentacarbonyl[chloro(pentamethyl-2,4-cyclopentadien-1-yl)phosphane]tungsten(0)}. NMR-spectroscopic and single-crystal X-ray structural data of some dinuclear carbene complexes and 2-(pentamethyl-2,4-cyclopentadien-1-yl)-2H-azaphosphirene complexes are presented.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
