Amphiphilie kationischer η2-Phosphinocarbenkomplexe des Wolframs

Article abstract of DOI:10.1016/0022-328X(94)05246-8

η²-Phosphinocarbene complexes of tungsten containing a trimethyl-phosphine ligand show an amphiphilic behavior.With the Lewis acid SMe⁺ an electrophilic attack occurs at the metal-carbon double bond to give 1-tungsta-2-phospha-4-thiabicyclo<1.1.0>butane complexes.On the contrary the Lewis base, PMe3, adds at the carbene carbon atom to yield a cationic trimethylphosphoraneylidene complex.However, treatment of dicarbonyl(η⁵-cyclopentadienyl)<η²-(diphenylphosphino)methylcarbene>-tungsten-tetraphenylborate with the less nucleophilic triethylamine causes deprotonation at the methyl group providing dicarbonyl(η⁵-cyclopentadienyl)-η²-diphenylphosphinovinyltungsten.Keywords: Tungsten; Amphiphilic carbene complexes; Phosphino carbene complexes