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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

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 (US)
Pages (from-to)4294-4297
Number of pages4
JournalJournal of the American Chemical Society
Volume138
Issue number13
DOIs
StatePublished - Apr 20 2016

ASJC Scopus subject areas

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

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