Mesoporous Material from Fly Ash as a Catalyst for Stereoselective Reduction of Substituted Cyclohexanones

被引：5
|
作者：
Sarkar, A. [1 ]
Banichul, H. [1 ]
机构：
[1] Indian Sch Mines, Dept Appl Chem, Organ Mat Res Lab, Dhanbad 82604, Jharkhand, India
来源：
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS | 2013年 / 35卷 / 04期
关键词：
cetyltrimethyl ammonium bromide; fly ash; mesoporous; stereoselective; substituted cyclohexanones; REDUCING AGENT; BOROHYDRIDE; MCM-41;
D O I：
10.1080/15567036.2010.503227
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Mesoporous material synthesized using ultrafine coal fly ash as a source for silicon and aluminium with cetyl trimethyl ammonium bromide as the structure directing agent has been found to be a good support for enhancing the stereoselectivity of reduction of some substituted cyclohexanones. Exclusive formation of trans-4-t-butyl cyclohexanol and 4-methyl cyclohexanol is evidenced by the appearance of single peaks in 1HNMR spectra ( = 3.5), which are due to axial CH protons. In other cases, enhancement of stereoselectivity has been observed. Apparently, Lewis/Bronsted acid sites present in the mesoporous material activate such preference for the formation of isomers with an equatorially disposed OH group. A probable transition state has been suggested.
引用
收藏
页码：352 / 363
页数：12
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