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Synfacts 2008(8): 0889-0889
DOI: 10.1055/s-2008-1077924
DOI: 10.1055/s-2008-1077924
Polymer-Supported Synthesis
© Georg Thieme Verlag
Stuttgart ˙ New York
Polyglycerol-Supported Co- and Mn-Salen Complexes as Recyclable Catalysts
M. Beigi, S. Roller, R. Haag, A. Liese*
NRW Graduate School of Chemistry, Münster, BASF AG, Ludwigshafen, Freie Universität Berlin and Hamburg University of Technology, Germany
Further Information
Publication History
Publication Date:
23 July 2008 (online)
Significance
The polyglycerol-supported Mn-salen catalyst 1 was prepared by mixing polymeric salen with Mn(OAc)2×4H2O in refluxing DMF followed by treatment with LiCl at room temperature for 12 hours. The catalyst was used in the asymmetric epoxidation of olefins (60% quantitative conversion with 25-96% ee, 6 examples). The catalyst was recovered by precipitation and reused three times in the epoxidation of 5 (time < 5 min; 1st: 98% conv., 91% ee; 2nd: 96% conv., 92% ee; 3rd: 90% conv., 91% ee; 4th: 75% conv., 88% ee).