Efficient preparation of binaphthol-derived active μ3-oxo titanium catalyst by using hydrated Na-zeolites (molecular sieves)

Koichi Mikami, Masahiro Terada, Yousuke Matsumoto, Masako Tanaka, Yoshiyuki Nakamura

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

NaA-zeolite (MS 4A), despite a desiccant of choice, serves anomalously as an H2O donor for the titanium precatalyst and acts as a base to trap HCl to give our active binaphthol-derived titanium (BINOL-Ti) catalyst (1) for the glyoxylate-ene reaction. The active species of BINOL-Ti catalyst (1) is primarily composed of the μ3-oxo (Ti3O) species, for which the NaA-zeolite employed in the catalyst preparation acts as an H2O donor. Among zeolites with a variety of counter-cations, Na-zeolites are found to enable the quick formation of the active BINOL-Ti catalyst. A sufficient amount of sodium cations in the zeolites is critical for the efficient preparation of the active catalyst rather than the sodium content, pore size, and acid/base character based on the aluminosilicate (zeolites) frameworks.

Original languageEnglish
Pages (from-to)461-466
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume21
Issue number4-6
DOIs
Publication statusPublished - 1998 May
Externally publishedYes

Keywords

  • Asymmetric catalysis
  • Binaphthol
  • Carbonyl-ene reaction
  • Titanium complex
  • Zeolite

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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