TY - JOUR
T1 - Supported Tetrahedral Oxo-Sn Catalyst
T2 - Single Site, Two Modes of Catalysis
AU - Beletskiy, Evgeny V.
AU - Hou, Xianliang
AU - Shen, Zhongliang
AU - Gallagher, James R.
AU - Miller, Jeffrey T.
AU - Wu, Yuyang
AU - Li, Tiehu
AU - Kung, Mayfair C.
AU - Kung, Harold H.
N1 - Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/4/20
Y1 - 2016/4/20
N2 - Mild calcination in ozone of a (POSS)-Sn-(POSS) complex grafted on silica generated a heterogenized catalyst that mostly retained the tetrahedral coordination of its homogeneous precursor, as evidenced by spectroscopic characterizations using EXAFS, NMR, UV-vis, and DRIFT. The Sn centers are accessible and uniform and can be quantified by stoichiometric pyridine poisoning. This Sn-catalyst is active in hydride transfer reactions as a typical solid Lewis acid. However, the Sn centers can also create Brønsted acidity with alcohol by binding the alcohol strongly as alkoxide and transferring the hydroxyl H to the neighboring Sn-O-Si bond. The resulting acidic silanol is active in epoxide ring opening and acetalization reactions.
AB - Mild calcination in ozone of a (POSS)-Sn-(POSS) complex grafted on silica generated a heterogenized catalyst that mostly retained the tetrahedral coordination of its homogeneous precursor, as evidenced by spectroscopic characterizations using EXAFS, NMR, UV-vis, and DRIFT. The Sn centers are accessible and uniform and can be quantified by stoichiometric pyridine poisoning. This Sn-catalyst is active in hydride transfer reactions as a typical solid Lewis acid. However, the Sn centers can also create Brønsted acidity with alcohol by binding the alcohol strongly as alkoxide and transferring the hydroxyl H to the neighboring Sn-O-Si bond. The resulting acidic silanol is active in epoxide ring opening and acetalization reactions.
UR - https://www.scopus.com/pages/publications/84964621973
U2 - 10.1021/jacs.5b13436
DO - 10.1021/jacs.5b13436
M3 - 文章
AN - SCOPUS:84964621973
SN - 0002-7863
VL - 138
SP - 4294
EP - 4297
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 13
ER -