1,2-bis(organostannyl)ethanes as powerful bidentate Lewis acids. Crystal structures of (Ph2ClSnCH2)2 · (Me2N)2PO and [Ph3PNPPh3][(Ph2ClSnCH2)2 · Cl]
作者:K. Jurkschat、F. Hesselbarth、M. Dargatz、J. Lehmann、E. Kleinpeter、A. Tzschach、J. Meunier-Piret
DOI:10.1016/0022-328x(90)85373-7
日期:1990.5
is 2260 M−1. The structures of 7 and 8 have been determined by X-ray diffraction. That of 7 shows that the two tin atoms are pentacoordinate but are inequivalent as a result of having different coordination sphere; one tin atom is coordinated by the monodentate HMPA (SnO 2.255(3) Å) whereas the other interacts with a bridging Cl (Sn(1); Cl(2) 3.000(1) Å). In the anion of 8, the bis(chlorodiphenylstannyl)ethane
(Ph 2 XSnCH 2)2(1,X = Ph; 2,X = Cl; 3,X = Br; 4,X = I)和(Ph 2 XSnCH 2)类型的双(有机甾烷)乙烷的合成描述了图2(5,X = Br,6,X = 1)。已通过1 H,13 C和119 Sn NMR光谱研究了这些化合物。2种发生反应与HMPA,[PH 3 P = N = PPH 3 ] +氯-或Ph 4PBR,分别以得到1/1络合物(PH 2 ClSnCH 2)2 ·HMPA(7),[PH 2 ClSnCH 2)2 ·CL] - [PH 3 PNPPh 3 ] +(8),和[(Ph 2 ClSnCH 2)2 ·Br] - [Ph 4 P] +(9)。CDCl 3溶液中8的形成常数K a为2260 M -1。7和8的结构已经通过X射线衍射确定。也就是说的7示出了这两个锡原子是五配位,但是不等价的具有不同配位层的结果; 一个锡原子由单齿HMPA(Sn