Silica-supported heteropoly acid catalyst for liquid-phase Friedel-Crafts reactions.
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概要
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Silica-supported Keggin-type heteropoly acids such as 12-tungstophosphoric, molybdophosphoric, and tungstosilicic acids efficiently catalyzed Friedel–Crafts alkylation and acylation reactions of aromatic hydrocarbons with 1-octene, benzyl chloride and benzoyl chloride in the liquid phase. The catalytic activity of heteropoly acid was generally enhanced when supported on silica. Silica-supported tungstosilicic acid worked as an insoluble heterogeneous catalyst even to the acylation of <I>p</I>-xylene with benzoyl chloride or benzoic anhydride, though deactivation was observed during repeated use. Considering that supported <I>p</I>-toluenesulfonic acid, an ordinarily used typical strong protonic acid, was far less active than the supported heteropoly acid, the high catalytic efficiency revealed by heteropoly acid appears to be due to a unique property of heteropoly anion which can stabilize alkyl and acyl cations as the reaction intermediates.
- 公益社団法人 日本化学会の論文
著者
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Izumi Yusuke
Department of Cardiology Ogakii Municipal Hospital
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Urabe Kazuo
Department Of Applied Chemistry School Of Engineering Nagoya University
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Izumi Yusuke
Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University
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Tamaoki Ikuyo
Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University
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Natsume Noriko
Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University
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Takamine Harumi
Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University
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Urabe Kazuo
Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University
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