Ring-substituted derivatives of .eta.5-cyclopentadienyltetracarbonylvanadium: synthesis and vanadium-51 NMR spectroscopic characteristics

Abstract

hexasolventocopper(II) ion in acetic acid is very fast, as expected from the Jahn-Teller effect of the copper(II) ion,2 while the solvent-exchange rate on the copper acetate is much slower, since the latter forms the dimeric structure and the solvated acetic acid molecules at its axial sites are stabilized by hydrogen bonding as depicted in I.Acknowledgment. The present work was supported through a Grant-in-Aid for Scientific Research (No. 59430010) and a Grant-in-Aid for Special Project Research (No. 60129031) from the Japanese Ministry of Education, Science, and Culture.

Monocyclopentadienyl Compounds of Vanadium

“…The X-ray structures of V(TI 5 -C 5 HS)(CO) 3 The use of PdO as catalyst in a ratio PdO/V=l/5 decreases the reaction time from 4 hours (without PdO) to 10 minutes.…”

“…There are two different routes to the THF vanadium complex by photolysis of THF solutions of V(ti 5 -C 5 Chalcogenides complexes of vanadium of general formula V(n 5 -C 5 H 5 )(CO) 3 EMe 2 (E=S,Se,Te), see Table 5, can be prepared by irradiation ofV^5-C 5 H 5 )(CO) 4 in the presence of EMe 2 (E=S,Se,Te) /23/. X-ray structural determination of ν(η 5 -ΰ 5 Η 5 )(03) 3 SMe 2 is shown in section 2.4, Figure 2 The high-field (low-frequency) isotope shift of metal shielding,on conversion of [Υ(η 5 -0 5 Η 5 )(00) 3 Ή]-to [V^5-C s H 5 )(CO) 3 2 H]·, has been studied and the isotope effect is of the order -4,7ppm. /8/.…”

“…Oxidation States (-1,0,+1) Containing as Other Ligands Nitrosiles and Groups IV, V or VI Donor Atom Ligands V(TI 5 -C 5 H 5 )(NO) 2 CO is prepared in 40% yield by the photo-reaction between V(TI 5 -C 5 H 5 )(CO) 3 The CO ligand in V(TI 5 -C 5 H 5 )(NO) 2 CO can also be displaced by other…”

“…Molecular structure of V(V-C 5 H 5 )(CO)3 As 2 (C 6 H5)4 reprinted with permission of J. Organometal. Chem.…”

“…The X-ray crystal structure of [CpVCl(PEt3 )] 2 is shown in Figure 3.1.4 which illustrates the dimeric nature of the Cp and PEt 3 ligands around the V-V axis. The molecule posesses a non crystallographic 2-fold axis that relates the two CpVCl(PEt 3 ) units.…”