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

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1999

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Journal of the American Chemical Society. 1999, 121(7), pp. 1524-1527. ISSN 0002-7863. eISSN 1520-5126. Available under: doi: 10.1021/ja983524w

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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.

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ISO 690RINGWALD, 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. 1999, 121(7), pp. 1524-1527. ISSN 0002-7863. eISSN 1520-5126. Available under: doi: 10.1021/ja983524w
BibTex
@article{Ringwald1999Asymm-23739,
  year={1999},
  doi={10.1021/ja983524w},
  title={Asymmetric thermal transformation, a new way to enantiopure biphenyl-bridged titanocene and zirconocene complexes : efficient catalysts for asymmetric imine hydrogenation},
  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}
}
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