Hydrogenation of acetophenone derivatives: Tuning the enantioselectivity via the metal-support interaction

被引：22

作者：

Hoxha, Fatos ^{[1
]}

Schmidt, Erik ^{[1
]}

Mallat, Tamas ^{[1
]}

Schimmoeller, Bjoern ^{[2
]}

Pratsinis, Sotiris E. ^{[2
]}

Baiker, Alfons ^{[1
]}

机构：

[1] ETH, Inst Chem & Bioengn, Dept Chem & Appl Biosci, HCI, CH-8093 Zurich, Switzerland

[2] ETH, Particle Technol Lab, Dept Mech & Proc Engn, CH-8092 Zurich, Switzerland

来源：

JOURNAL OF CATALYSIS | 2011年 / 278卷 / 01期

基金：

瑞士国家科学基金会;

关键词：

Metal-support interaction; Acetophenone derivatives; Asymmetric hydrogenation; Platinum; Cinchonidine; RAY-ABSORPTION SPECTROSCOPY; ASYMMETRIC HYDROGENATION; ACTIVATED KETONES; ETHYL PYRUVATE; PARTICLE-SIZE; CHEMISORPTION PROPERTIES; HETEROGENEOUS CATALYSIS; CHIRAL MODIFICATION; CINCHONA ALKALOIDS; MODIFIED PLATINUM;

D O I：

10.1016/j.jcat.2010.11.025

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 influence of acidic and basic supports on the enantioselective hydrogenation of acetophenone and its aryl-substituted derivates was studied. The Pt/Al2O3, Pt/Al2O3-SiO2, and Pt/Al2O3-Cs2O catalysts were prepared by single-step flame spray pyrolysis, and cinchonidine (CD) was used as chiral modifier. For all five aromatic ketones, the acidic support improved the ee, while the basic support diminished it. Opposite tendencies were observed for the reaction rate: acidic support lowered and basic support enhanced the rate of ketone conversion. In situ investigation of the hydrogenation of the quinoline ring of CD revealed for the first time that degradation of the modifier leads to remarkable variation in the substrate/modifier ratio. This effect and a possible catalyst deactivation due to aldol condensation of the ketones may be the origin of the decrease in ee with conversion. Following the diastereoselectivity during hydrogenation of the heteroaromatic ring of the quinoline unit of CD proved dominantly pro(S) adsorption mode on Pt/Al2O3 and Pt/Al2O3-SiO2, and pro(R) on Pt/Al2O3-Cs2O catalysts. Changes in the adsorption mode were minor during hydrogenation of aromatic ketones. This, together with the small effect of ketones on the hydrogenation rate of CD, is interpreted as an indication to weak substrate-modifier interactions, in contrast to the situation during the hydrogenation of alpha-ketoesters (methyl benzoylformate). (C) 2010 Elsevier Inc. All rights reserved.

引用

页码：94 / 101

页数：8

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