Catalysis Database

New immobilized chiral Mn(III) salen complexes on pyridine N-oxide-modified MCM-41 as effective catalysts for epoxidation of nonfunctionalized alkenes

R I, Kureshy and Irshad , Ahmed and N H, Khan and S.H.R., Abdi and Surendra, Singh and Preti H, Pandia and R V , Jasra (2005) New immobilized chiral Mn(III) salen complexes on pyridine N-oxide-modified MCM-41 as effective catalysts for epoxidation of nonfunctionalized alkenes. Journal of Catalysis , 235 (1). pp. 28-34.

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Official URL: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WHJ-4GX0CK1-1&_user=518931&_coverDate=10%2F01%2F2005&_alid=589647082&_rdoc=12&_fmt=full&_orig=search&_cdi=6852&_sort=d&_docanchor=&view=c&_ct=28&_acct=C000025838&_version=1&_urlVersion=0&_userid=5

Abstract

We prepared new chiral Mn(III) salen complexes 1′–4′ immobilized on pyridine N-oxide-modified MCM-41 through the axial coordination. Epoxidation of styrene and 4-chlorostyrene with the use of these complexes as catalysts in the presence of NaOCl was found to proceed enantioselectively (ee, 62–69%) at 0 °C in 8–12 h, which is a significantly higher enantioselectivity than that observed for their homogeneous counterparts (ee, 36–51%). These catalysts were also effective for the relatively bulkier alkenes, such as indene and 2,2-dimethylchromene, and have shown a reactivity (82–98%) and an enantioselectivity (69–92%) similar to those observed for their homogeneous system. The catalysts could be recycled several times without loss of performance.

Item Type:Article
Uncontrolled Keywords:Enantioselective epoxidation; Modified MCM-41; Nonfunctionalized alkenes; Chiral Mn(III) salen complexes
Subjects:Science > Chemistry
ID Code:915
Deposited By:Prof Balasubramanian Viswanathan
Deposited On:16 Jun 2007 14:17
Last Modified:16 Jun 2007 14:17

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