Supported Tetrahedral Oxo-Sn Catalyst: Single Site, Two Modes of Catalysis

Evgeny V. Beletskiy, Xianliang Hou, Zhongliang Shen, James R. Gallagher, Jeffrey T. Miller, Yuyang Wu, Tiehu Li, Mayfair C. Kung, Harold H. Kung

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)4294-4297
Number of pages4
JournalJournal of the American Chemical Society
Issue number13
Publication statusPublished - Apr 20 2016

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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