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Asymmetric thermal transformation, a new way to enantiopure biphenyl-bridged titanocene and zirconocene complexes : efficient catalysts for asymmetric imine hydrogenation

Asymmetric thermal transformation, a new way to enantiopure biphenyl-bridged titanocene and zirconocene complexes : efficient catalysts for asymmetric imine hydrogenation

Type of Publication: Journal article
Author: Ringwald, Markus; Stürmer, Rainer; Brintzinger, Hans-Herbert
Year of publication: 1999
Published in: Journal of the American Chemical Society ; 121 (1999), 7. - pp. 1524-1527. - ISSN 0002-7863. - eISSN 1520-5126
DOI (citable link): https://dx.doi.org/10.1021/ja983524w
Summary:
Enantiopure biphenyl-bridged titanocene and zirconocene complexes were obtained, by an asymmetric thermal transformation of the binaphthol complexes formed from the metallocene racemates and subsequent transformation to the corresponding dichlorides, in practically quantitative yields. Increased rates of this transformation in the presence of O2 gas or TEMPO indicate a radical reaction mechanism. The biphenyl-bridged titanocene enantiomers give rise to an efficient asymmetric catalysis for the hydrogenation of cyclic and noncyclic imines.
Subject (DDC): 540 Chemistry

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RINGWALD, Markus, Rainer STÜRMER, Hans-Herbert BRINTZINGER, 1999. Asymmetric thermal transformation, a new way to enantiopure biphenyl-bridged titanocene and zirconocene complexes : efficient catalysts for asymmetric imine hydrogenation. In: Journal of the American Chemical Society. 121(7), pp. 1524-1527. ISSN 0002-7863. eISSN 1520-5126. Available under: doi: 10.1021/ja983524w

@article{Ringwald1999Asymm-23739, title={Asymmetric thermal transformation, a new way to enantiopure biphenyl-bridged titanocene and zirconocene complexes : efficient catalysts for asymmetric imine hydrogenation}, year={1999}, doi={10.1021/ja983524w}, number={7}, volume={121}, issn={0002-7863}, journal={Journal of the American Chemical Society}, pages={1524--1527}, author={Ringwald, Markus and Stürmer, Rainer and Brintzinger, Hans-Herbert} }

Journal of the American Chemical Society ; 121 (1999), 7. - S. 1524-1527 Brintzinger, Hans-Herbert 2013-06-24T17:02:50Z 2013-06-24T17:02:50Z Ringwald, Markus Ringwald, Markus Stürmer, Rainer eng Brintzinger, Hans-Herbert Asymmetric thermal transformation, a new way to enantiopure biphenyl-bridged titanocene and zirconocene complexes : efficient catalysts for asymmetric imine hydrogenation 1999 Stürmer, Rainer terms-of-use Enantiopure biphenyl-bridged titanocene and zirconocene complexes were obtained, by an asymmetric thermal transformation of the binaphthol complexes formed from the metallocene racemates and subsequent transformation to the corresponding dichlorides, in practically quantitative yields. Increased rates of this transformation in the presence of O<sub>2</sub> gas or TEMPO indicate a radical reaction mechanism. The biphenyl-bridged titanocene enantiomers give rise to an efficient asymmetric catalysis for the hydrogenation of cyclic and noncyclic imines.

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