title: Preparation and characterization of chiral oxazaborolidine complex immobilized SBA-15 and its application in the asymmetric reduction of prochiral ketones.
abstract: The immobilization of chiral oxazaborolidine complex in the well-ordered mesochannels of SBA-15 is demonstrated by a postsynthetic approach using 3-aminopropyltriethoxysilane as a reactive surface modifier. The immobilized catalysts are characterized by various techniques, such as XRD, nitrogen adsorption, HRSEM, UV/Vis diffuse reflectance spectroscopy, and FTIR spectroscopy. The catalysts are used for the enantioselective reduction of aromatic prochiral ketones. The activity of the chiral oxazaborolidine complex immobilized SBA-15 catalysts is also compared with that of the pure chiral oxazaborolidine complex, which is a homogeneous catalyst. It is found that the activity of the chiral complex immobilized SBA-15 heterogeneous catalyst is comparable with that of the homogeneous catalyst.
authors.affiliation: International Center for Materials Nanoarchitectonics, World Premier International (WPI) Research Initiative, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Umesh
authors.initials: U
authors.lastname: Balakrishnan
authors.forename: Nallamuthu
authors.initials: N
authors.lastname: Ananthi
authors.forename: Sakthivel Tamil
authors.initials: ST
authors.lastname: Selvan
authors.forename: Ravindra
authors.initials: R
authors.lastname: Pal
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Ariga
authors.forename: Sivan
authors.initials: S
authors.lastname: Velmathi
authors.forename: Ajayan
authors.initials: A
authors.lastname: Vinu
mesh_terms: D001880:Boranes / Q000737:chemistry*; D002384:Catalysis; D007659:Ketones / Q000737:chemistry*; D010084:Oxidation-Reduction; D011437:Propylamines; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D001880:Boranes; D007659:Ketones; D011437:Propylamines; C509969:SBA-15; D012821:Silanes; D012822:Silicon Dioxide; C477625:amino-propyl-triethoxysilane