Gas-phase Meerwein-Ponndorf-Verley reaction:: correlation of the 3665 cm-1 IR band with the cis-alcohol selectivity

被引:17
作者
Akata, B [1 ]
Warzywoda, J [1 ]
Sacco, A [1 ]
机构
[1] Northeastern Univ, Ctr Adv Micrograv Mat Proc, Dept Chem Engn, Boston, MA 02115 USA
基金
美国国家航空航天局;
关键词
IR spectroscopy; Lewis acidity; Meerwein-Ponndorf-Verley reaction; zeolite beta;
D O I
10.1016/j.jcat.2003.11.008
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
The two Lewis acid sites assumed to catalyze the Meerwein-Ponndorf-Verley (MPV) reaction are identified by IR bands at 3782 and 3660-3680 cm(-1). Different combinations of heat-treatment protocols were used and the results indicated that the final temperature, ramp rate, and gas environment make a difference in the relative intensities of the 3782 and 3665 cm(-1) bands. Combining different heat-treatment procedures, samples were produced where the 3782 and 3665 cm(-1) band intensities moved in opposite directions (i.e., one increasing and the other decreasing). The MPV reduction of 4-tert-butylcyclohexan one with 2-propanol in the gas phase was studied at 100 degreesC in a nitrogen atmosphere. The increasing trend of the relative intensity of the 3665 cm(-1) band showed a correlation in favor of the formation of cis-4-tert-butylcyclohexanol (cis-4-TBCHL). This suggests that the species associated with the 3665 cm(-1) band are likely responsible for cis-4-TBCHL selectivity. (C) 2003 Elsevier Inc. All rights reserved.
引用
收藏
页码:397 / 403
页数:7
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