Journal
APPLIED CATALYSIS A-GENERAL
Volume 475, Issue -, Pages 140-146Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2014.01.017
Keywords
Polyoxometalates; Lanthanides; Cyanosilylation; Lewis acids
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Funding
- National Science Foundation of China [21222104, 21076020]
- Fundamental Research Funds for the Central Universities [ZZ1227]
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We reported for the first time the development of tri-lacunary polyoxometalates (POMs) of Na8H[A-PW9O34].7H(2)O and Na8H[B-PW9O34].19H(2)O (Na-A-PW9 and Na-B-PW9) as highly selective and efficient heterogeneous Lewis base catalysts for Knoevenagel condensation, cyanosilylation of various aldehydes and ketones and the synthesis of benzoxazole derivatives at 25 degrees C under mild conditions. Since both Na-A-PW9 and Na-B-PW9 display no characteristic porosity, it is proposed that the catalytic reactions proceed not only on the surface and interface, but also in the bulk phase. The catalysts can be easily recovered and reused for at least six times without obvious decrease of catalytic activities and the structures of the catalysts remain unchanged after recycling. The easy preparation, high efficiency, reusability of the heterogeneous catalysts of Na-A-PW9 and Na-B-PW9 exhibit great potential for further application. (C) 2014 Elsevier B.V.All rights reserved.
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