Synthesis, molecular structure and stereoisomerization of 2-phosphinyl and 2-phosphonylethyl diorganotin halides
作者:H. Weichmann、C. Mügge、A. Grand、J.B. Robert
DOI:10.1016/s0022-328x(00)83797-3
日期:1982.11
structure in solution for compounds V–IX. Upon varying the temperature, concentration or solvent in solutions of compounds V–IX a stereoisomerization is observed. On the basis of NMR 1H, 13C, 31P, 119Sn), IR and conductivity studies, it is suggested that this stereoisomerization involves a hexacoordinated transition state at the tin atom.
R 2 Sn(X)(CH 2)2 P(O)PhR'(R = Me,t-Bu; Rt́ = OEt,t-Bu; X = Cl,Br)类型的功能取代的三有机锡卤化物V–IX具有通过卤素裂解相应的四有机锡化合物R 2 R 2 Sn(CH 2)2 P(O)PhR'(R 2 = Me或Ph),I–IV合成。Me 2 Sn(Br)(CH 2)2的固态结构通过X射线衍射测定的P(O)PhBu-t(IX)在锡原子上显示出扭曲的三角-双锥体结构,且分子内配位有PO基团。光谱数据与化合物V–IX的溶液中的这种结构一致。通过改变化合物V–IX溶液中的温度,浓度或溶剂,可以观察到立体异构化。基于NMR 1 H,13 C,31 P,119 Sn),IR和电导率研究,建议该立体异构化涉及锡原子处的六配位过渡态。