Nucleophilic substitution of 4-bromomethyltriazolium with different nucleophiles
作者:Xingyu Xu、Linfeng Li、Zengyu Zhang、Xiaoyu Yan
DOI:10.1016/j.tet.2018.10.009
日期:2018.11
1,2,3-Triazolium salts draw much attentions in recent years. We developed a new synthetic method to heteroatom-functionalized triazoliums via nucleophilicsubstitution of 4-bromomethyltriazolium. This method afforded triazoliums with different S, N, and O heteroatom-substituents. Moreover, SN2′ reaction was observed with alcohols or hydroxides. In addition, debromination and debromomethylation reaction
近年来,1,2,3-三唑鎓盐备受关注。我们开发了一种新的合成方法,用于通过4-溴甲基三唑的亲核取代作用来杂原子官能化的三唑。该方法提供了具有不同S,N和O杂原子取代基的三唑鎓。此外,观察到与醇或氢氧化物的S N 2'反应。另外,在某些情况下发生脱溴和脱溴甲基化反应。
Kinetic study of the thermal decomposition on bis(dialkyldithiocarbamate) Cd(II) complexes by isothermal and non-isothermal thermogravimetry
Abstract The thermal decomposition kinetics of solid Cd(S 2 CNR 2 ) 2 complexes, where R=C 2 H 5 , n -C 3 H 7 , n -C 4 H 9 and iso-C 4 H 9 , has been studied using isothermal and non-isothermal thermogravimetry. Superimposed TG/DTG/DSC curves show that thermal decomposition reactions occur in the liquid phase. The kinetic model that best adjusted the experimental isothermal TG data was the one-dimensional
摘要 研究了固体 Cd(S 2 CNR 2 ) 2 配合物的热分解动力学,其中 R=C 2 H 5 、n -C 3 H 7 、n -C 4 H 9 和iso-C 4 H 9 ,已使用等温和非等温热重法。叠加的 TG/DTG/DSC 曲线表明热分解反应发生在液相中。最佳调整实验等温TG数据的动力学模型是一维相界反应控制过程R 1 。热分析数据表明热稳定性序列 Cd(S 2 CNBu n 2 ) 2 >Cd(S 2 CNPr n 2 ) 2 >Cd(S 2 CNBu i 2 ) 2 >Cd(S 2 CNEt 2 ) 2 ,根据表观活化能的稳定性顺序。
Glycal Assembly by the in Situ Generation of Glycosyl Dithiocarbamates
作者:Panuwat Padungros、Laura Alberch、Alexander Wei
DOI:10.1021/ol301349w
日期:2012.7.6
Glycalassembly offers an expedient entry into β-linked oligosaccharides, but epoxyglycal donors can be capricious in their reactivities. Treatment with Et2NH and CS2 enables their in situ conversion into glycosyl dithiocarbamates, which can be activated by copper triflate for coupling with complex or sterically congested acceptors. The coupling efficiency can be further enhanced by in situ benzoylation
Hochdruckversuche: Umsetzungen von kohlenstoffdisulfid mit aminen, amiden und olefinen—V
作者:J. Petermann、H. Plieninger
DOI:10.1016/0040-4020(75)85058-7
日期:1975.1
Suitable tertiary amines react with CS2, 100°C, 104 atm to give N,N-disubstituted thioformamides. Salts of dialkyldithiocarbamic acids decompose at the same conditions into dialkylthioformamide and sulphur. After addition of cyclohexene, mainly N,N-dialkyldithiocarbamic acid cyclohexyl ester has been obtained. Carbon disulfide and sulphur add to olefins yielding trithiocarbonates. Dimethyl formamide
This protocol describes a novel, mild and convenient route to afford 2-aminobenzoxazoles in high yields, and represents a significant advance towards an environmentally friendly strategy. Aliphatic amines are made to react with carbon disulfide to provide intermediate dithiocarbamates (DTC), which in the presence of 2-aminophenol, subsequently undergo successive intermolecular nucleophilic attack and desulfurization to produce 2-aminobenzoxazoles within 3 h.