Preparation and characterization of chiral oxazaborolidine complex immobilized SBA-15 and its application in the asymmetric reduction of prochiral ketones.
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.
Balakrishnan
Umesh
U
International Center for Materials Nanoarchitectonics, World Premier International (WPI) Research Initiative, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan.
Ananthi
Nallamuthu
N
Selvan
Sakthivel Tamil
ST
Pal
Ravindra
R
Ariga
Katsuhiko
K
Velmathi
Sivan
S
Vinu
Ajayan
A
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
D001880:Boranes; D007659:Ketones; D011437:Propylamines; C509969:SBA-15; D012821:Silanes; D012822:Silicon Dioxide; C477625:amino-propyl-triethoxysilane