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Synthesis of a Siliceous MCM-41 using C22TMACI Template and Preparation of Heterogenized New Chiral Salen Complexes
Department of Chemical Engineering, Inha University, Inchon 402-751, Korea 1Division of Chemistry, Agency for Technology and Standards, Kwacheon, Kyunggi-do 427-010, Korea
Kimgj@dragon.inha.ac.kr
Korean Journal of Chemical Engineering, May 2000, 17(3), 337-343(7), 10.1007/BF02699050
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Abstract
Purely siliceous MCM-41 has been prepared under both mild and acidic condition by a solvent evaporation method using C16TMABr and C22TMACI surfactant as templates. A hydrothermal synthesis was also carried out by utilizing a method of adjusting the gel pH to 10. The mesoporous samples synthesized in ethanol solvent by using this evaporation method showed a fully disordered pore system, but those obtained in the hydrothermal synthesis had highly ordered pores. The chiral salen Mn(III) complexes were immobilized on the siliceous MCM-41 by a new grafting method using 3-aminopropyltrimethylsilane and diformylphenols. These ligands on MCM-41 were stable during the reactions. High enantioselectivities were displayed in the epoxidation of styrene by using these heterogenized salen complexes.
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Lopez J, Liang S, Bu XR, Tetrahedron Lett., 39, 4199 (1998)
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Zondervan C, vandenBeuken EK, Kooijman H, Spek AL, Feringa BL, Tetrahedron Lett., 38, 3111 (1997)
