Zeolite effect in the enantioselective transhydrogenation over a Co‐salen “ship‐in‐the‐bottle” complex |
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Authors: | W Kahlen HH Wagner WF Hölderich |
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Abstract: | Our investigations were focused on the transhydrogenation of carbonyl groups using Co(II)‐salen complexes entrapped in zeolites.
The Co‐salen 1 complex was occluded in the zeolite as a “ship‐in‐the‐bottle” (SIB) catalyst, as could be demonstrated by means
of DRIFT‐IR spectra, DTG, nitrogen adsorption isothermes and soxhlet extraction. The results of the test reactions show that
an immobilization of the Co‐salen 1 complex in the zeolite as a “SIB” complex results in an enantiomeric excess as high as
in the homogeneous case. The Co‐salen 1 USY SIB catalyst shows its best ee‐value at higher temperature (25°C) than the homogeneous
one (-10°C). The reason could be the steric constraints of the Co‐salen complex in the zeolite framework.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Co(II)‐ salen complexes “ ship‐ in‐ the‐ bottle” catalyst enantioselective transhydrogenation enantiomeric excess |
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