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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 8
BKCSDE 30(8)
August 20, 2009 

 
Title
Asymmetric Ring Opening of Terminal Epoxides Catalyzed by Chiral Co(III)-BF3 Salen Complex Immobilized on SBA-16
Author
Yong Suk Kim, Choong Young Lee, Geon Joong Kim*
Keywords
Asymmetric catalysis, Chiral cobalt salen, Non-covalent attachment, SBA-16, Mesoporous silica
Abstract
The homogeneous BF3 containing chiral Co(III) salen complexes were anchored non-covalently on the surfaces of mesoporous SBA-16 silica containing aluminum species. The Bronsted and Lewis acidic sites are attributed to the immobilization of fluorine functionalized chiral salen complexes on the supports. The FT-IR, UV, ESCA, and NMR analyses were performed to determine the structure of synthesized chiral salen catalysts. These heterogeneous catalysts could be applied in asymmetric ring opening of terminal epoxides by water and phenol derivatives. They showed very high enantioselectivity and yield more than 98% in the catalytic synthesis of optically active products.
Page
1771 - 1777
Full Text
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