Structure and mechanism of hydrolysis of diaryl(acylamino)(chloro)-λ4-sulfanes and diaryl(acylamino)sulfonium salts†
作者:Péter Nagy、Antal Csámpai、Dénes Szabó、Jenő Varga、Veronika Harmat、Ferenc Ruff、Árpád Kucsman
DOI:10.1039/b008156f
日期:——
interaction was detected between the sulfonium centre and solvent molecules having a negatively polarized oxygen atom. The hydrolysis of sulfonium salts yielding sulfoxides was investigated by a kinetic method in 98∶2 (v/v) dioxane–water mixture and in water. On the basis of medium, substituent (ρ +1.03), steric, salt and kinetic isotope effects detailed mechanisms involving a hydroxy-λ4-sulfane intermediate
芳基(methylaminocarbonylaryl)硫化物被转化吨-BuOCl到二芳基(酰氨基)(氯) - λ 4 -sulfanes或根据取代基的相应的二芳基(酰氨基)锍氯化物š -芳基。1 H NMR数据表明,氯λ 4个仅在存在-sulfanesCDCl 3 和 DMSO-d 6 溶剂,而在CD 3 OD中发生完全的离子离解,导致生成氯化sulf。的化学位移1 H NMR信号和NOE数据表明氯λ 4具有-sulfanes盐和锍盐的ö -MeO,ö -Cl或ö -Me取代基上苯基 环呈偏斜构象,而 芳基没有邻位取代基的化合物中的环几乎可以绕S(C'1')轴自由旋转。在ø -MeO取代的衍生物存在一个赤道1,4型S ⋯ ö紧密接触。锍盐具有轴向1,5 S型⋯ ö涉及相邻COOMe密切接触,CONHMe,来或NO 2发生在蝴蝶构象组,如螺- λ 4 -sulfanes。氮的15 N化学位移