Titanium-catalyzed heterogeneous oxidations of silanes, chiral allylic alcohols, 3-alkylcyclohexanes, and thianthrene 5-oxide:: A comparison of the reactivities and selectivities for the large-pore zeolite Ti-β, the mesoporous Ti-MCM-41, and the layered alumosilicate Ti-ITQ-2

被引：53

作者：

Adam, W ^{[1
]}

Corma, A

García, H

Weichold, O

机构：

[1] Univ Wurzburg, Inst Organ Chem, D-97074 Wurzburg, Germany

[2] Univ Politecn Valencia, CSIC, Inst Tecnol Quim, E-46071 Valencia, Spain

来源：

JOURNAL OF CATALYSIS | 2000年 / 196卷 / 02期

关键词：

zeolites; heterogeneous oxidation; silanes; allylic alcohols; thianthrene; 5-oxide;

D O I：

10.1006/jcat.2000.3043

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：

A comparative study of silane oxidation, olefin epoxidation, and thianthrene 5-oxide sulfoxidation with the oxidants Ti-beta /H2O2, Ti-MCM-41/t-BuOOH, and Ti-ITQ-2/t-BuOOH provides the catalytic reactivity order Ti-beta > Ti-MCM-41 > Ti-ITQ-2. The steric constraints of the narrow channels make the Ti-beta zeolite the most selective. For the more open structures of the Ti-MCM-41 and Ti-ITQ-2 hosts, such steric constraints are less pronounced and, therefore, a lower selectivity is exhibited by these heterogeneous catalysts. Both activate t-BuOOH for oxygen transfer through a transition structure analogous to the homogeneous Ti(Oi-Pr)(4)/t-BuOOH oxidant. (C) 2000 Academic Press.

引用

页码：339 / 344

页数：6

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