在这里,我们报告了一个诊断框架,用于阐明基于氢/氘(H/D)分馏的基于光氧化还原的氢同位素交换(HIE)反应的机制。传统的热 HIE 方法通常通过共享共同过渡态的可逆键断裂和键重组步骤进行。然而,光驱动 HIE 反应中的键断裂和键重组可以通过多个非简并的基本步骤组进行,从而使机械分析和随之而来的优化工作变得复杂。基于平衡同位素效应的经典处理,这里提出的分馏方法通过比较氘结合到底物中可交换 C-H 键的程度相对于溶剂储层的 H/D 同位素比。我们表明,分馏程度对交换过程的机制敏感,并提供了区分同位素交换简并和非简并机制的方法。在模型系统中,分馏方法隐含的机制与热化学考虑因素预测的机制一致。然后,我们采用该方法来研究 HIE 反应,其机制在热力学基础上并不明确。
Unsymmetrical disulfide and sulfenamide synthesis via reactions of thiosulfonates with thiols or amines
作者:Nobukazu Taniguchi
DOI:10.1016/j.tet.2017.02.047
日期:2017.4
The reactivity of thiosulfonates with nucleophilic reagents was investigated. When reactions of thiosulfonates with thiols were performed, unsymmetricaldisulfides were obtained in excellent yields. This procedure could employ numerous aryl or alkyl thiols. On the other hand, reactions of thiosulfonates with amines proceeded in the presence of a copper catalyst. The procedure was performed efficiently
4′-Nitroarenesulphenanilides: Their use in the synthesis of unsymmetrical disulphides
作者:L. Benati、P.C. Montevecchi、P. Spagnolo
DOI:10.1016/s0040-4039(00)84361-0
日期:1986.1
The reaction of 4′-nitroarenesulphenanilides with thiols in the presence of boron trifluoride etherate can provide an effective route to unsymmetricaldisulphides.
Stereoselective Synthesis of Alkenyl Silanes, Sulfones, Phosphine Oxides, and Nitroolefins by Radical C–S Bond Cleavage of Arylalkenyl Sulfides
作者:Ya-mei Lin、Guo-ping Lu、Rong-kang Wang、Wen-bin Yi
DOI:10.1021/acs.orglett.7b00126
日期:2017.3.3
has been introduced for the C–S bond activation of arylalkenyl sulfides. The protocol provides an efficient approach for the generation of various alkenes including alkenyl silanes, sulfones, phosphineoxides, and nitroolefins. In most cases, these radical substitutions are performed under metal-free conditions with stereospecificity.
N -Trifluoroacetyl arenesulfenamides, effective precursors for synthesis of unsymmetrical disulfides and sulfenamides
作者:Ming Bao、Masao Shimizu
DOI:10.1016/j.tet.2003.09.080
日期:2003.11
unsymmetrical disulfides (4) and sulfenamides (5). Reactions of 3 with a variety of aromatic thiols at room temperature were generally complete within 5 min and gave unsymmetrical diaryl disulfides in high yields. Aralkyl disulfides were isolated in high yields from the reaction of 3 with aliphatic thiols. The nucleophilic substitution reactions of 3 with amines proceeded smoothly and provided N-substituted
The mechanism of the anodicoxidation of dithioacetals is discussed, taking into account new results concerning both mixed electrolyses and oxidations in super-dried solvents. In the case of the oxidation of aryldithioacetals, the formation of the -S-S- linkage is involved with a bond cleavage followed by a dimerisation. On the other hand, in the case of aliphatic starting materials the mechanism looks