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Phosphorus‐Bridged Dinuclear Tungsten Amino(aryl)carbene Complexes – New Precursors for (2 H ‐Azaphosphirene)tungsten Complexes bearing a σ‐P‐Bonded Cp* Group ☆
Author(s) -
Streubel Rainer,
Rohde Udo,
Jeske Jörg,
Ruthe Frank,
Jones Peter G.
Publication year - 1998
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199812)1998:12<2005::aid-ejic2005>3.0.co;2-c
Subject(s) - carbene , chemistry , aryl , tungsten , triethylamine , medicinal chemistry , photochemistry , stereochemistry , catalysis , organic chemistry , alkyl
The first syntheses of pentacarbonyl[2‐(pentamethyl‐2,4‐cyclopentadien‐1‐yl)‐2 H ‐azaphosphirene]tungsten complexes are reported, using a one‐pot reaction of dichloro(pentamethyl‐2,4‐cyclopentadien‐1‐yl)phosphane (Cp*PCl 2 ) 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 2 H ‐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)‐2 H ‐azaphosphirene complexes are presented.