Application of Poly(Vinylbenzyltrimethylammonium Tribromide) Resin as an Efficient Polymeric Catalyst in the Acetalization and Diacetylation of Benzaldehydes
作者:Zubiao Zheng、Bingbing Han、Junjun Hu、Xianwei Li
DOI:10.2174/1570178617999200718002933
日期:2021.3
applications of a new supported tribromide reagent (poly(vinylbenzyltrimethylammonium tribromide) resin) were reported. This supported tribromide resin was used as a catalyst in the acetalization and diacetylation of benzaldehydes under mild conditions with high efficiency. The effects of solvents, and amount of the supported tribromide resin on the reactions were investigated. Under the optimal conditions
New Brønsted-Lewis Acidic Quaternary Ammonium Ionic Liquids: Synthesis, Acidity Determination and Acidity-Catalytic Activity Relationship
作者:Fengping Yi、Jie Gao、Lirong Zhang、Xiaoyan Jiang
DOI:10.14233/ajchem.2015.17494
日期:——
A series of new Brønsted-Lewis acidic ionic liquids,which are operational simplicity, high stability, low cost and applicable for scaling up, have been synthesized and their activity for acetalization was examined. The comprehensive studies on the acidity-catalytic performance relationship of the Brønsted-Lewis acidic ionic liquids were performed. IR spectroscopy results confirmed that the new Brønsted-Lewis acidic ionic liquids possess both Brønsted and Lewis acid sites. The acidities were determined by Hammett method, and further studies on acidity-activity relationship revealed that the acidity played a key role in the acid-catalyzed probe reactions.
Facile Aldolization Catalyzed by Ionic Liquid [4-Sulfbmpyrazine][BF4]
作者:Jianzhong Zou、Fengping Yi、Lirong Zhang、Zhen Wang
DOI:10.14233/ajchem.2013.14396
日期:——
The acidic functionalized ionic liquid 1-(4-sulfonic group)butyl-3-methylpyrazine tetrafluoroborate (abbreviated as [4-sulfbmpyrazine][BF4]) was employed as the catalyst of the condensation of aromatic aldehyde and diols. The optimized condition was as follows: aromatic aldehyde (0.20 mol), diols (0.30 mol) and [4-sulfbmpyrazine][BF4] (0.60 g) were refluxed in cyclohexane (10.00 mL) for 1 h. A series of aromatic aldehydes were studied and afforded the corresponding acetals products with good yields which were from 70.3 to 96.9 %. The ionic liquid catalyst could be recycled for four times without significant loss of catalyst reactivity.
Rapid Cyclic Acetal and Cyclic Ketal Synthesis Assisted by a Rotary Evaporator
作者:Fuyao Jiang、Yinzhe Chen、Qian Zhang、Weiding Wang
DOI:10.1055/a-2293-3243
日期:——
Herein, we present a rapid and efficient method for synthesizing cyclicacetals and ketals utilizing a rotary evaporator. Unlike the conventional Dean–Stark dehydration process, which typically demands extended reaction times and copious amounts of organic solvents, our approach affords the synthesis of cyclicacetals and ketals with varying ring sizes in 30 min while using minimal quantities of dimethyl
Aliphatic and aromatic acetals are easily and efficiently converted to the corresponding nitriles by reaction with hydroxylamine hydrochloride in refluxing absolute ethanol.