論文

査読有り
2011年12月

Gas-Phase Alkylation of Pyridine and Phenol with Alcohols Over Halide Clusters of Group 5-7 Transition Metals as Solid Acid Catalysts

JOURNAL OF CLUSTER SCIENCE
  • Sayoko Nagashima
  • ,
  • Satoshi Kamiguchi
  • ,
  • Satoshi Ohguchi
  • ,
  • Teiji Chihara

22
4
開始ページ
647
終了ページ
660
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1007/s10876-011-0411-5
出版者・発行元
SPRINGER/PLENUM PUBLISHERS

Pyridine is allowed to react with methanol under a hydrogen stream in the presence of (H3O)(2)[(W6Cl8)Cl-6]center dot 6H(2)O supported on silica gel. When the temperature is raised above 200 A degrees C, the catalytic activity of the cluster appears. Methylation of pyridine proceeds yielding 2-methylpyridine in 61% selectivity at 400 A degrees C. The corresponding hexanuclear chloride clusters of niobium, molybdenum, and tantalum also catalyze the reaction. Ethanol affords the corresponding 2-ethylpyridine. When phenol is allowed to react with methanol in the presence of (H3O)(2)[(Mo6Cl8)Cl-6]center dot 6H(2)O supported on silica gel in the same manner, selective O-methylation proceeds yielding anisole in 57% selectivity at 150-200 A degrees C. Above 250 A degrees C, C-methylation predominates and provides o-cresol with 67% selectivity at 300 A degrees C. The corresponding clusters of niobium, tantalum, and tungsten also catalyze the reaction. Ethanol and 1-propanol afford the corresponding 2-alkylphenols. Alkyl cations produced over weak Bronsted acid sites (H (0) a parts per thousand +1.3) developed on the clusters are assumed as intermediates for both reactions.

リンク情報
DOI
https://doi.org/10.1007/s10876-011-0411-5
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000297250000008&DestApp=WOS_CPL
ID情報
  • DOI : 10.1007/s10876-011-0411-5
  • ISSN : 1040-7278
  • Web of Science ID : WOS:000297250000008

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