Cobalt(II)-catalyzed chemoselective synthesis of acetals from aldehydes
作者:Subbarayan Velusamy、T Punniyamurthy
DOI:10.1016/j.tetlet.2004.04.126
日期:2004.6
The acetalization of aldehydes has been studied with methanol, ethanol, and 2-propanol using CoCl2 in high yields under reflux conditions. The reaction is simple, efficient, chemoselective and does not involve any other additive.
Diverse acetals from stoichiometric amounts of aldehydes and alcohols under very mild conditions: a new twist to PPh<sub>3</sub>–CCl<sub>4</sub> reagent combination
作者:Niko S. Radulović、Milan S. Nešić
DOI:10.1039/c6ra19980a
日期:——
The most frequently utilized method for the preparation of acetals is the reaction of alcohols and aldehydes or ketones, but it suffers from a number of shortcomings: bad thermodynamics, the...
制备乙缩醛最常用的方法是醇与醛或酮的反应,但它具有许多缺点:热力学差,化学性质不佳。
Formation of Acetals and Ketals from Carbonyl Compounds: A New and Highly Efficient Method Inspired by Cationic Palladium
作者:Enoch A. Mensah、Shawn D. Green、Jesse West、Tyler Kindoll、Brenda Lazaro-Martinez
DOI:10.1055/s-0039-1690497
日期:2019.9
acetals and ketals is described. This methodology relies on the nature of the palladium catalyst to direct the acetalization/ketalization reaction. This new protocol is mild and proceed with a very low catalyst loading at ambient temperatures. The method has been extended to a wide variety of different carbonyl compounds with various steric encumbrances to form the corresponding acetals and ketals in excellent
Chemistry of oxaziridines. 3. Asymmetric oxidation of organosulfur compounds using chiral 2-sulfonyloxaziridines
作者:Franklin A. Davis、Robert H. Jenkins、Sami B. Awad、Orum D. Stringer、William H. Watson、Jean Galloy
DOI:10.1021/ja00384a028
日期:1982.10
Die chiralen Sulfonyloxaziridine (IV) und (V) [dargestellt aus den Sulfonamiden (I) uber die Stufen (III)], (VIa) und (VIb) [analog 19 dargestellt] bewirken bei der asymm. Oxidation von Sulfiden wie z.B. (VII) eine hohere Enantioselektivitat als chirale Persauren.
Die chiralen Sulfonyloxaziridine (IV) 和 (V) [dargestellt aus den Sulfonamiden (I) uber die Stufen (III)]、(VIa) 和 (VIb) [analog 19 dargestellt] bewirken bei der asymm。氧化 von Sulfiden wie zB (VII) eine hohere Enantioselektivitat als chirale Persauren。
Highly efficient triphenyl(3-sulfopropyl)phosphonium functionalized phosphotungstic acid on silica as a solid acid catalyst for selective mono-allylation of acetals
作者:Sumit B. Kamble、Suhas H. Shinde、Chandrashekhar V. Rode
DOI:10.1039/c5cy00531k
日期:——
A silica-supported zwitterion-functionalized phosphotungstic acid catalyst developed for the selective Hosomi–Sakurai reaction giving 93–99% yield of homoallyl ethers.