Thermochemical parameters of dialkyldithiocarbamate chelates of indium(III)
摘要:
A series of dialkyldithiocarbamate chelates of indium(III) of the general formula In(S2CNR2)(3), (R = C2H5, n-C3H7, i-C3H7, n-C4H9 and i-C4H9), were prepared from the reaction of hydrochloric acid solution of metallic indium and the corresponding dialkylammonium salt of the ligand at pH = 3-4, giving yields better than 78%. The standard molar enthalpies of formation of crystalline dialkyldithiocarbamate chelates of In(III), were determined through reaction-solution calorimetry in acetone, at 298.15 K. The corresponding standard molar enthalpies of sublimation were estimated by means of differential scanning calorimetry. By combining of the values from these enthalpies, the standard molar enthalpies of formation in the gas were obtained. From the standard molar enthalpies of formation of the gaseous chelates the homolytic 191.9 +/- 3.6, 167.9 +/- 3.1, 136.4 +/- 2.5, 174.3 +/- 3.0 and 189.1 +/- 3.9 kJ mol(-1), and heterolytic 938.1 +/- 3.6, 961.9 +/- 3.1, 993.5 +/- 2.7, 1003.0 +/- 3.0 and 1047.3 +/- 3.9 kJ mol(-1), mean indium-sulphur bond-dissociation enthalpies were calculated. (C) 2000 Elsevier Science B.V. All rights reserved.
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。
Utilization of carbon disulfide as a powerful building block for the synthesis of 2-aminobenzoxazoles
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.
Cu-mediated one-pot three-component synthesis of 3-N-substituted 1,4,2-benzodithiazine 1,1-dioxide derivatives
作者:Wei Dong、Zemei Ge、Xin Wang、Ridong Li、Runtao Li
DOI:10.1016/j.tet.2020.131354
日期:2020.7
A novel and efficient copper-catalyzed one-pot procedure for the synthesis of 3-N-substituted 1,4,2-benzodithiazine 1,1-dioxide derivatives from 2-halobenzenesulfonamides, amines and CS2 is described. The reaction proceeds through Ullmann-type S-arylation, intramolecular addition of NH2 with CS and dehydrosulfide, which provides a new and useful strategy for construction of cyclic aromatic sulfonamides
METHOD FOR PRODUCING ARYL, HETEROARYL, OR ALKENYL-SUBSTITUTED UNSATURATED HYDROCARBON
申请人:Nishizawa Toshiaki
公开号:US20120142975A1
公开(公告)日:2012-06-07
The present invention relates to a method for producing aryl-, heteroaryl- or alkenyl-substituted unsaturated hydrocarbons, containing: reacting aryl halides, heteroaryl halides or alkenyl halides with alkynes or alkenes in the presence of a palladium catalyst to obtain a crude product, and subsequently distillatively purifying the crude product in the presence of a compound having at least one NC═S group.
Enthalpies of formation of crystalline dialkylammoniumdialkyldithiocarbamates: alkyl = ethyl, n-propyl, i-propyl, n-butyl, and i-butyl
作者:Manuel A.V Ribeiro Da Silva、Ana M.V Reis、Geoffrey Pilcher
DOI:10.1016/0021-9614(87)90030-9
日期:1987.8
The standard (po = 101.325 kPa) molar enthalpies of formation of some crystalline dialkylammoniumdialkyldithiocarbamates were determined at 298.15 K by both solution-reactioncalorimetry and by rotating-bomb calorimetry. The values from the two methods agreed to within the limits of experimental error, giving the weighted mean values: R ΔfHmo(R2NH2S2CNR2, cr)/(kJ·mol−1) Ethyl −249.2±2.2 n-Propyl −353
一些结晶二烷基二烷基二硫代氨基甲酸铵的标准 (po = 101.325 kPa) 摩尔形成焓是在 298.15 K 下通过溶液反应量热法和旋转弹量热法测定的。两种方法的值在实验误差范围内一致,给出加权平均值: R ΔfHmo(R2NH2S2CNR2, cr)/(kJ·mol−1) 乙基 -249.2±2.2 正丙基 -353.2±1.3 i-丙基 -349.6±1.3 正丁基 -461.3±1.6 异丁基 -463.8±1.4