使用韦尔斯-道森酸(H 6 P 2 W 18 O 62 ·24H 2 O)从醛中进行无溶剂催化制备1,1-二乙酸酯
摘要:
通过用乙酸酐和韦尔斯道森酸(H 6 P 2 W 18 O 62 ·24H 2 O)处理,可以在温和的条件下将芳香族和脂肪族醛转化为1,1-二乙酸酯(酰基)。在室温和无溶剂条件下,用少量的1%mol Wells-Dawson酸在Ac 2 O中进行宝石二乙酰化反应,获得1,1-二乙酸酯的非常好至极好的收率(88-98%)(19个实例)。4-二甲基氨基苯甲醛和酮都不会在相同条件下反应。
A Facile and Efficient Conversion of Aldehydes into 1,1-Diacetates (Acylals) using Iron(III) Fluoride as a Novel Catalyst
作者:V. T. Kamble、R. A. Tayade、B. S. Davane、K. R. Kadam
DOI:10.1071/ch06166
日期:——
Aldehydes are smoothly converted into the corresponding 1,1-diacetates (acylals) in high yields in the presence of a catalytic amount (0.1 mol-%) of iron(III) fluoride at room temperature. The noteworthy features of the present system are shorter reaction times, chemoselective protection of aldehydes, and solvent-free conditions. The procedure is especially useful for large-scale syntheses as the catalyst
Copper(II) Tetrafluoroborate-Catalyzed Formation of Aldehyde-1,1-diacetates<sup />
作者:Asit K. Chakraborti、Ramasamy Thilagavathi、Raj Kumar
DOI:10.1055/s-2004-816000
日期:——
Aldehyde 1,1-diacetates are formed in excellent yields from aldehydes and acetic anhydride under solvent-free conditions at room temperature in short times in the presence of a catalytic amount of copper(II) tetrafluoroborate hydrate.
A NOVEL AND EFFICIENT CONVERSION OF ALDEHYDES TO 1,1-DIACETATES CATALYZED WITH FeCl<sub>3</sub>/SiO<sub>2</sub>UNDER MICROWAVE IRRADIATION
作者:Cunde Wang、Minghua Li
DOI:10.1081/scc-120014779
日期:2002.1
ABSTRACT 1,1-Diacetates (3) are effectively synthesized in few minutes by acylation reaction of aldehydes with acetic anhydride in the presence of FeCl3/SiO2 under microwave irradiation.
Poly(4-vinylpyridinium) perchlorate as an efficient solid acid catalyst for the chemoselective preparation of 1,1-diacetates from aldehydes under solvent-free conditions
作者:Nader Ghaffari Khaligh
DOI:10.1016/s1872-2067(12)60750-5
日期:2014.3
Abstract Poly(4-vinylpyridinium) perchlorate has been used as a supported, recyclable, environmentally-benign catalyst for the formation of acylals from aliphatic and aromatic aldehydes in good to excellent yields under solvent-free conditions. Notably, the reaction conditions were tolerant of ketones. This methodology offers several distinct advantages, including its operational simplicity and high
Thallium(III) Chloride: A Mild
and Efficient Catalyst for Acylation of Alcohols, Phenols
and Thiols, and for Geminal Diacylation of Aldehydes under
Solvent-Free Conditions
作者:Sung Kim、Santosh Kadam
DOI:10.1055/s-0028-1083148
日期:——
simple and efficientcatalyst for acylation of alcohols, phenols and thiols. It is also very effective for geminal diacylation of aldehydes. The acylation reaction using acetic anhydride proceeds in excellent yield in the presence of catalytic amounts ofthallium(III) chloride (1 mol%) at room temperature within relatively short reaction times (<20 min). Structurally diverse alcohols, phenols, thiols and