Hydrogenation and dehalogenation of aryl chlorides and fluorides by the sol-gel entrapped RhC13,-Aliquat 336 ion pair catalyst

被引：28

作者：

Blum, J ^{[1
]}

Rosenfeld, A

Gelman, F

Schumann, H

Avnir, D

机构：

[1] Hebrew Univ Jerusalem, Dept Organ Chem, IL-91904 Jerusalem, Israel

[2] Tech Univ Berlin, Inst Anorgan & Analyt Chem, D-10623 Berlin, Germany

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 1999年 / 146卷 / 1-2期

关键词：

immobilized-catalyst; sol-gel; rhodium; Aliquat 336 (R); dehalogenation; hydrogenation;

D O I：

10.1016/S1381-1169(99)00280-0

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：

The SiO2 sol-gel entrapped ion pair C(C8H17)(3)NMe](+)[RhCl(4)nH(2)O](-), generated from RCl(3)3H(2)O, Aliquat 336(R) and Si(OMe)(4) catalyzes at 80 degrees C and 16 atm. H-2, the hydrogenation of aryl fluorides and chlorides to give halogen-free hydroaromatics. Fluorobenzenes initially yield fluorocyclohexanes which eliminate HF, in a non-catalytic process, followed by hydrogenation of the cyclohexenes. in contrast, chlorobenzenes are first dehalogenated to the corresponding benzene derivatives, that in a second step are hydrogenated to cyclohexanes. Aryl bromides undergo dehalogenation and hydrogenation as well, but only in the presence of a free radical scavenger. The catalyst in these reactions is leach-proof and recyclable with little of no loss in activity. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：117 / 122

页数：6

共 21 条

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