搜索结果: 1-8 共查到“有机合成化学 catalyst”相关记录8条 . 查询时间(0.053 秒)
Bromodimethylsulfonium bromide/tetrabutylammonium nitrite: an efficient catalyst mixture for the nitration of phenols
Bromodimethylsulfonium bromide nitration nitrophenol tetrabutylammonium nitrite
font style='font-size:12px;'>
2010/12/3
Nitrophenols were obtained via direct nitration of phenols with tetrabutylammonium nitrite in the presence of bromodimethylsulfonium bromide at room temperature in high yields under aprotic conditions...
Bromodimethylsulfonium Bromide/ Tetrabutylammonium Nitrite: An Efficient Catalyst Mixture for the Nitration of Phenols
Bromodimethylsulfonium bromide nitration, nitrophenol tetrabutylammonium nitrite
font style='font-size:12px;'>
2010/10/19
Nitrophenols were obtained via direct nitration of phenols with tetrabutylammonium nitrite in the presence of bromodimethylsulfonium bromide at room temperature in high yields under aprotic conditions...
Sulfonic acid-functionalized silica: a remarkably efficient heterogeneous reusable catalyst for the one-pot synthesis of 1,4-dihydropyridines
1,4-Dihydropyridine b-dicarbonyl compounds solid acid SiO2-R-SO3H
font style='font-size:12px;'>
2010/10/19
An efficient one-pot method for the synthesis of 1,4-dihydropyridines from b-dicarbonyl compounds, aldehyde, and ammonium acetate is reported using sulfonic acid-functionalized silica at 90 °C under s...
Silica supported polyphosphoric acid (PPA-SiO2): an efficient and reusable heterogeneous catalyst for the one-pot synthesis of a -amino phosphonates
a -Amino phosphonates PPA-SiO2 heterogeneous catalyst
font style='font-size:12px;'>
2010/10/19
An efficient green protocol is described for the preparation of a -amino phosphonates, employing a one-pot three-component condensation reaction between aldehydes, amines, and trialkyl phosphites in t...
An efficient one pot synthesis of 1,4-dihydropyridines using alumina sulfuric acid (ASA) catalyst
Hantzsch 1 4-dihydropyridines ASA catalyst one pot conversion
font style='font-size:12px;'>
2010/4/8
An efficient synthetic method for 1,4-dihydropyridines has been developed using 3 or 4 component condensation reactions of aldehydes, 1,3-dicarbonyl compounds, and ammonium acetate in the presence of ...
Investigation of the fuel properties of biodiesel produced over an alumina-based solid catalyst
Biodiesel fuel properties transesterification heterogeneous basic catalyst
font style='font-size:12px;'>
2010/4/9
The present study investigated the transesterification process used in the production of canola oil methyl ester from canola oil and methanol over synthesized KF/Al2O3 catalysts. Different amounts of ...
Characterization of TiO2 Synthesized in Alcohol by a Sol-Gel Process: The Effects of Annealing Temperature and Acid Catalyst
Characterization of TiO2 Synthesized a Sol-Gel Process Effects of Annealing Temperature Acid Catalyst
font style='font-size:12px;'>
2010/4/19
The effects of annealing temperature and hydrolysis catalyst on the crystalline form and crystallite size of TiO2 prepared by a sol-gel process were investigated. Three types of TiO2 were synthesized ...
Diels-Alder Reactions Using 5 M LiClO4 -Diethyl Ether Catalyst
Diels-Alder Reactions 5 M LiClO4 -Diethyl Ether Catalyst
font style='font-size:12px;'>
2010/4/22
The rate acceleration of Diels-Alder reactions in 5.0 M lithium perchlorate-diethyl ether was re-examined using itaconic anhydride and itaconic acid. Rate acceleration was observed for non-functionali...