A Simple and Efficient Method for Reduction of Sulfoxide Under Solvent-Free Conditions
摘要:
Benzyl DABCO bromide was found to be an efficient and mild reagent for the reduction of sulfoxides to the corresponding sulfide using sulfuric acid adsorbed silica gel under solvent-free conditions at room temperature.
Bis(1-benzyl-4-aza-1-azoniabicyclo[2.2.2]octane) Peroxodisulfate: A Mild and Efficient Oxidant for Cleavage of Nitrogen Double Bonds and Oxidation of Alcohols under Anhydrous Conditions
Bis(1-benzyl-4-aza-1-azoniabicyclo[2.2.2]octane) peroxodisulfate (1), is readily prepared as an orange solid from commercially available 1,4-diazabicyclo[2.2.2]octane and potassium peroxodisulfate. This reagent easily converts hydrazones, semicarbazones, oximes, and alcohols to the corresponding carbonyl compounds with excellent yields.
A high yielding synthesis of stilbene oxides using ammonium ylides has been developed. It turned out that the amine leaving group plays a crucial role as trimethylamine gives higher yields than DABCO or quinuclidine. The amine group also influences the diastereoselectivity, and detailed DFT calculations to understand the key parameters of these reactions have been carried out.
Modified Borohydride Agents, 1-Benzyl-4-aza-1-azoniabicyclo[2.2.2]octane Tetrahydroborate (BAAOTB) versus Tetrabutylammonium Tetrahydroborate (TBATB). Efficient, Selective, and Versatile Reducing Agents
作者:Habib Firouzabadi、Gholam Reza Afsharifar
DOI:10.1246/bcsj.68.2595
日期:1995.9
1-Benzyl-4-aza-1-azoniabicyclo[2.2.2]octane tetrahydroborate (BAAOTB) and tetrabutylammonium tetrahydroborate (TBATB) are used for the selective reductions of aldehydes, ketones, α,β-unsaturated carbonyl compounds, acid chlorides, azides, epoxides, and disulfides in t-BuOH and hexane/chloroform. ABBOAB with its rigid and bulky structure reacts more selectively than its analogue TBATB.
A simple, efficient and green procedure for Knoevenagel condensation catalyzed by [C4dabco][BF4] ionic liquid in water
作者:Da-Zhen Xu、Yingjun Liu、Sen Shi、Yongmei Wang
DOI:10.1039/b918595j
日期:——
convenient and rapid method for Knoevenagelcondensation has been developed by using DABCO-base ionic liquid catalysts. This method is applicable to a wide range of aromatic/aliphatic/heterocyclic/α,β-unsaturated aldehydes and ketones with active methylene compounds, and affords the corresponding substituted electrophilic alkenes in excellent yields (up to 100%) in water at room temperature within short
Degradation of Organic Cations under Alkaline Conditions
作者:Wei You、Kristina M. Hugar、Ryan C. Selhorst、Megan Treichel、Cheyenne R. Peltier、Kevin J. T. Noonan、Geoffrey W. Coates
DOI:10.1021/acs.joc.0c02051
日期:2021.1.1
degradation mechanisms of organiccations under basic conditions is extremely important for the development of durable alkaline energy conversion devices. Cations are key functional groups in alkaline anion exchange membranes (AAEMs), and AAEMs are critical components to conduct hydroxide anions in alkaline fuel cells. Previously, we have established a standard protocol to evaluate cation alkaline stability
了解碱性条件下有机阳离子的降解机理对于开发耐用的碱性能量转换装置极为重要。阳离子是碱性阴离子交换膜(AAEM)中的关键官能团,而AAEM是在碱性燃料电池中传导氢氧根阴离子的关键组分。以前,我们已经建立了一个标准协议来评估KOH / CD 3中的阳离子碱稳定性80°C下的OH溶液。在这里,我们使用该协议比较26种模型化合物,包括苄基铵,四烷基铵,螺环铵,咪唑鎓,苯并咪唑鎓,三唑鎓,吡啶鎓,胍鎓和and阳离子。目的不仅是评估它们的降解速率,而且是确定它们的降解途径并导致具有改善的碱性稳定性的阳离子的发展。