The reactivity of electrogenerated S⅓– polysulfide ions S3˙– (⇌S62–) towards S-phenyl thiol esters RC(O)SPh [R = Me (1), Et (2), Pri (3)] has been followed by spectroelectrochemistry in N,N-dimethylacetamide at 24 °C. With 1 and 2 reactions readily lead to thiocarboxylate ions and phenyltetrasulfanide ions, PhS4–, from the nucleofugic benzenethiolate ions in presence of sulfur. With 3 kinetic studies imply that S62– species are the nucleophilic S⅓– agents rather than S3˙– radical anions in a second order rate process (k = 30 ± 3 dm3 mol–1 s–1).
在 24 °C、N,N-二甲基乙酰胺中,通过分光电
化学研究了电生 S⅓-多
硫离子 S3˙- (⇌S62-)与 S-苯基
硫醇酯 RC(O)
SPh [R = Me (1)、Et (2)、Pri (3)]的反应性。在有
硫存在的情况下,1 和 2 反应很容易导致
硫代
羧酸根离子和苯
四磺酸根离子 PhS4-,从呈核的苯
硫酸根离子中生成
硫代
羧酸根离子和苯
四磺酸根离子。3 的动力学研究表明,在二阶速率过程(k = 30 ± 3 dm3 mol-1 s-1)中,S62- 物种是亲核 S⅓-剂,而不是 S3˙-自由基阴离子。