PHOSPHINE BORANES IN COORDINATION CHEMISTRY - AN EFFICIENT METHOD FORTHE SYNTHESIS OF CHIRAL AND ACHIRAL ORGANOPHOSPHORUS PENTACARBONYLTUNGSTEN COMPLEXES
N. Brodie et S. Juge, PHOSPHINE BORANES IN COORDINATION CHEMISTRY - AN EFFICIENT METHOD FORTHE SYNTHESIS OF CHIRAL AND ACHIRAL ORGANOPHOSPHORUS PENTACARBONYLTUNGSTEN COMPLEXES, Inorganic chemistry, 37(10), 1998, pp. 2438-2442
Organophosphorus boranes 1-6 and amine pentacarbonyltungsten complexes
14-20 react under mild conditions, to afford by Ligand exchange the c
orresponding W(CO)(5)(PR3) 21-26 derivatives in 63-92% yields. The use
of piperazine 13 as a diamine tungsten substituent permits a tandem r
eaction which removes the borane group and leads to the formation of t
he corresponding organophosphorus tungsten complex. The stereochemistr
y of the formation of pentacarbonyltungsten complexes from tertiary ch
iral organophosphorus borane compounds proceeds with a high stereosele
ctivity and retention of configuration at the chiral P center.