ansa-vanadocene complexes : syntheses, structures and ligand exchange reactions


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DORER, Birgit, Marc-Heinrich PROSENC, Ursula RIEF, Hans-Herbert BRINTZINGER, 1997. ansa-vanadocene complexes : syntheses, structures and ligand exchange reactions. In: Collection of Czechoslovak Chemical Communications. 62(2), pp. 265-278. ISSN 0010-0765. eISSN 1212-6950. Available under: doi: 10.1135/cccc19970265

@article{Dorer1997ansav-23757, title={ansa-vanadocene complexes : syntheses, structures and ligand exchange reactions}, year={1997}, doi={10.1135/cccc19970265}, number={2}, volume={62}, issn={0010-0765}, journal={Collection of Czechoslovak Chemical Communications}, pages={265--278}, author={Dorer, Birgit and Prosenc, Marc-Heinrich and Rief, Ursula and Brintzinger, Hans-Herbert} }

Rief, Ursula Dorer, Birgit Dorer, Birgit Tetramethylethano-bridged vanadocene dichlorides (CH<sub>3</sub>)<sub>4</sub>C<sub>2</sub>(3-R-C<sub>5</sub>H<sub>3</sub>)<sub>2</sub>VCl<sub>2</sub> with R = H, Me, t-Bu are obtained by reacting the corresponding ligand MgCl salts with vanadium(III) acetylacetonato compounds, followed by oxidation with PCl<sub>3</sub> or AgCl. Smooth ligand exchange reactions of these ansa-vanadocene dichlorides afford acetylacetonato cations and binaphtholate complexes; from these, the dichlorides are regenerated by exposure to MgCl<sub>2</sub> in THF solution. Separation of meso and rac isomers (as well as enantiomer separation) is achieved via corresponding binaphtholate complexes; conversion to the vanadium(III) diisonitrile cations (CH<sub>3</sub>)<sub>4</sub>C<sub>2</sub>(3-R-C<sub>5</sub>H<sub>3</sub>)<sub>2</sub>V(CNt-Bu)<sub>2</sub><sup>+</sup> allows an assessment of diastereoisomer ratios by <sup>1</sup>H NMR. Lewis-acidic bistriflate derivatives of these ansa-vanadocene complexes are obtained from the dichlorides by reaction with silver triflate. Collection of Czechoslovak chemical communications ; 62 (1997), 2. - S. 265-278 2013-07-25T06:43:24Z Prosenc, Marc-Heinrich eng 2013-07-25T06:43:24Z deposit-license 1997 ansa-vanadocene complexes : syntheses, structures and ligand exchange reactions Prosenc, Marc-Heinrich Brintzinger, Hans-Herbert Brintzinger, Hans-Herbert Rief, Ursula

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