12-Tungstophosphoric acid supported on nano silica from rice husk ash as an efficient catalyst for direct benzylation of 1,3-dicarbonyl compounds in solvent-free condition

被引：29

作者：

Rafiee, Ezzat ^{[1
,2
]}

Khodayari, Maryam ^{[1
]}

Shahebrahimi, Shabnam ^{[1
]}

Joshaghani, Mohammad ^{[1
,2
]}

机构：

[1] Razi Univ, Dept Chem, Fac Sci, Kermanshah, Iran

[2] Kermanshah Oil Refining Co, Kermanshah, Iran

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2011年 / 351卷

关键词：

Nano particle; Solvent-free; Benzylation; Supported heteropoly acid; Nucleophilic substitution; HETEROPOLY ACIDS; ACTIVE METHYLENES; ALKYLATION; PRECIPITATION; ALCOHOLS; INDOLES;

D O I：

10.1016/j.molcata.2011.10.008

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nano silica has been prepared from rice husk, which is an agricultural waste, with high surface area and in amorphous form. 12-Tungstophosphoric acid, H3PW12O40 (PW) has been supported on this silica to produce nano silica supported PW (NPW/SiO2) as a nano catalyst. Characterization of this catalyst has been investigated by TEM, FTIR, and ICP, also, acidic properties have been studied by potentiometric titration method. 40% NPW/SiO2 has been used as a high effective catalyst for benzylation of 1,3-dicarbonyl compounds with benzylic alcohols. The present methodology offers a clean, practical, simple, mild, environmentally friendly, green and time-saving method under solvent free condition. Also, the catalyst is a good candidate for large-scale in direct benzylation of 1,3-dicarbonyl compounds. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：204 / 209

页数：6

共 36 条

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