Phosphine boranes in coordination chemistry: An efficient method for the synthesis of chiral and achiral organophosphorus pentacarbonyltungsten complexes

Organophosphorus boranes 1-6 and amine pentacarbonyltungsten complexes 14-20 react under mild conditions, to afford by Ligand exchange the corresponding W(CO)(5)(PR3) 21-26 derivatives in 63-92% yields. The use of piperazine 13 as a diamine tungsten substituent permits a tandem reaction which removes the borane group and leads to the formation of the corresponding organophosphorus tungsten complex. The stereochemistry of the formation of pentacarbonyltungsten complexes from tertiary chiral organophosphorus borane compounds proceeds with a high stereoselectivity and retention of configuration at the chiral P center.