Brunner, Henri and Leblanc, Jean-Claude and Lucas, Dominique and Meier, Walter and Moise, Claude and Mugnier, Yves and Nuber, Bernd and Rigny, Sandrine and Sadorge, Andre and Wachter, Joachim (1998) Syntheses and reactivity of oxo niobocene complexes Cp-2*Nb(=O)X (X = H, OCH3) and crystal structures of [Cp-2*Nb(OH)F]BF4 and Cp-2*Nb(=O)OC(O)H (Cp* = eta(5)-C5Me5). JOURNAL OF ORGANOMETALLIC CHEMISTRY, 566 (1-2). pp. 203-210. ISSN 0022-328X, 1872-8561
Full text not available from this repository.Abstract
Reaction of Cp-2*NbCl2 (Cp* = eta(5)-C5Me5) with KOH or Ba(OH)(2) . 8H(2)O in THF forms the complexes Cp-2*Nb(=O)X OC = Cl: 2, H: 3). The ratio of 2 and 3 depends on the stoichiometry. If NaOMe is added or MeOH in solution Cp-2*Nb(=O)OMe 4 is formed in good yields. Reactivity studies with 3 and 4 show that the Nb=O as well as the Nb-X unit behave as chemically active sites. Protonation of 3 or 4 with HBF4 is followed by an attack of fluoride (from BF4- anion) to give [Cp-2*Nb(OH)F]BF4 6 and [Cp-2*NbF2]BF4 7. In contrast the reaction of 3 or 4 with HCO2H results in an exchange of X- by formate to give Cp-2*Nb(=O)OC(O)H 8. The crystal structures of 6 and 8 are reported. Electrochemical investigations of 2-4 and 7, 8 reveal reaction pathways for the transformation of 1 into 3. (C) 1998 Elsevier Science S.A. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COORDINATED CARBON-DIOXIDE; DERIVATIVES; PERMETHYLTANTALOCENE; DECARBONYLATION; INSERTION; REDUCTION; HYDRIDES; LIGANDS; OXYGEN; ALKYL; niobocene; oxo ligands; formato complex; reactivity; structures |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Alumni or Retired Professors > Arbeitskreis Dr. Joachim Wachter Chemistry and Pharmacy > Institut für Anorganische Chemie > Alumni or Retired Professors > Prof. Dr. Henri Brunner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Feb 2023 07:39 |
| Last Modified: | 16 Feb 2023 07:39 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49497 |
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