E. Diezbarra et al., PHOSPHORUS YLIDE NIOBIUM COMPLEXES - SYNTHESIS AND CHARACTERIZATION OF THE FIRST ALPHA-KETO YLIDE COMPLEXES, [(NBCL3(YLIDE-O,N))(2)] AND [NBCL3(YLIDE-O,N)(RC-CR')] (YLIDE = -THIAZOLYLCARBONYL)METHYLENE]TRIPHENYLPHOSPHORANE, NOSC4H2CH-PPH3) - MOLECULAR-STRUCTURE OF [NBCL3(NOSC4H2CHPPH3-O,N)(PHC-CPR)] (PH = PHENYL, PR = PROPY), Journal of organometallic chemistry, 542(2), 1997, pp. 291-294
Reactions of [{NbCl3(dme)}(n)] or [NbCl3(dme)(RC=CR')] with a heterocy
cle containing alpha-keto stabilized phosphorus ylide, 2-TCMP = 2-thia
zolylcarbonyl}methylene]triphenyphosphorane, allowed the synthesis of
the first alpha-keto ylide niobium complexes, [{NbCl3(2-TCMP)}(2)] and
[NbCl3(2-TCMP)(RC=CR')] respectively. The new complexes were spectros
copically characterized and the X-ray molecular structure for one of t
hem was also determined. (C) 1997 Elsevier Science S.A.