论文部分内容阅读
报道了通式为Ｙ＿ｎＳｎＢｕ＿（４－ｎ）的含呋喃基、噻吩基、Ｎ－甲基吡咯基、吡啶基的丁基锡（Ⅳ）的~（１３）Ｃ、~（１１９）ＳｎＮＭＲ谱。基于化学位移及偶合常数讨论了丁基及各杂环基与锡的键合性质，丁基~（１３）Ｃ谱显示，锡对丁基的影响是电正性取代诱导效应。~（１１９）Ｓｎ谱及杂环基~（１３）Ｃ谱表明，杂环与锡存在ｐπ－ｄπ相互作用。~（１３）Ｃ，~（１１９）Ｓｎ化学位移值随杂环取代数目呈线性变化，随着杂环基的增加，呋喃或噻吩的两个α－碳峰互相接近，而两个β－碳峰则逐渐分离，~（１１９）Ｓｎ峰则大幅度移向高场。
The ~ (13) C, ~ (119) SnNMR spectra of butyltin (Ⅳ) containing furyl, thienyl, N-methylpyrrolyl and pyridyl of general formula Y_nSnBu_ (4-n) have been reported. The bonding properties of butyl and heterocyclyl groups with tin were discussed based on chemical shifts and coupling constants. The butyl ~ (13) C spectrum showed that the effect of tin on butyl was the effect of electropositive substitution. The ~ (119) Sn and ~ (13) C spectra of ~ (119) show that there exists pπ-dπ interaction between heterocycle and tin. The chemical shift values of ~ (13) C, ~ (119) Sn change linearly with the number of heterocyclic substitutions. As the heterocyclic groups increase, the two α-carbon peaks of furan or thiophene are close to each other, The peaks gradually separated, while the ~ (119) Sn peak shifted to the high field.