Coordination of CrIII(salen) on functionalised silica for asymmetric ring opening reactions of epoxides

Catalysis Letters

Volumn 97, Issue 3-4, 2004, Pages 125-129

  Dioos, Bart M L ^a   Geurts, Wouter A ^a   Jacobs, Pierre A ^a  

^a UNIVERSITY OF LEUVEN   (Belgium)

Author keywords

Asymmetric ring opening; Chiral Cr(salen) complex; Coordinative anchoring; Epoxides

Indexed keywords

ASYMMETRIC RING OPENING; CHIRAL CR(SALEN) COMPLEX; COORDINATIVE ANCHORING; EPOXIDES;

CATALYSTS; CHROMIUM; COMPLEXATION; FUNCTIONS; LEACHING; SILICA;

REACTION KINETICS;

EID: 4344601744     PISSN: 1011372X     EISSN: None     Source Type: Journal    
DOI: 10.1023/B:CATL.0000038573.81490.03     Document Type: Article

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14. The procedure used for the preparation of the catalyst is based on references [4] and [12] with some small modifications.
15. III(salen) catalyst was bought from Aldrich.
16. Silica gel 60 for preparative column chromatography was bought from Fluka.
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21. 3+ ions have two absorption bands at about 430 and 614 nm due to d-d transitions.
22. In a recycling experiment for the ARO of epoxyhexane over three consecutive runs, leaching increased from 2% in the first run to 5 and 8% in the second and third run respectively. An analogous increase in leaching is found for epoxyoctane.
23. 3+ species are relatively inert.
24. The IR anayses were performed on KBr samples of the silica material used for 10 runs.
25. 2 bending.
26. 3 species [13].