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Immobilization of Chiral Ruthenium(II) Complex and Its Catalytic Application in Enantioselective Transfer Hydrogenation

✍ Scribed by Nie Chun-Fa; Suo Ji-Shuan

Publisher: John Wiley and Sons
Year: 2005
Tongue: English
Weight: 68 KB
Volume: 23
Category: Article
ISSN: 0256-7660
DOI: 10.1002/cjoc.200590315

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✦ Synopsis

Chiral Ru-BsDPEN, (1R,2R)-N-p-benzenesulfonyl-1,2-diphenylethylenediamine, catalyst has been immobilized on a mesoporous molecular sieve of MCM-41 type successfully. A hybrid mesoporous molecular sieve was synthesized using a precursor bearing benzene group, which in organosilica were sulfonylated and reacted with (1R,2R)-1,2-diphenylethylenediamine and [RuCl 2 (p-cymene)] 2 successively to afford immobilized catalyst. The Brunauer-Emmett-Teller (BET) surface area and Barrett-Joyner-Halenda (BJH) pore size decreased after immobilization of catalyst onto the mesoporous material. Enantioselective transfer hydrogenation of ketones catalyzed by immobilized catalyst showed the highest yield of 22.36% and e.e. value of 31.47% by using acetophenone as substrate when reaction time was 48 and 16 h respectively.

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