K. Jurkschat, F. Hesselbarth, M. Dargatz
May 22, 1990
Citations
0
Influential Citations
35
Citations
Journal
Journal of Organometallic Chemistry
Abstract
Abstract The synthesis of bis(organostannyl)ethanes of the types (Ph 2 XSnCH 2 ) 2 ( 1 , X = Ph; 2 , X = Cl; 3 , X = Br; 4 , X = I) and (Ph 2 XSnCH 2 ) 2 ( 5 , X = Br, 6 , X = I) is described. The compounds have been investigated by means of 1 H, 13 C and 119 Sn NMR spectroscopy. 2 reacts with HMPA, [Ph 3 P = N = PPh 3 ] + Cl − , and Ph 4 PBr, respectively, to give the 1/1 complexes (Ph 2 ClSnCH 2 ) 2 · HMPA ( 7 ), [Ph 2 ClSnCH 2 ) 2 · Cl] − [Ph 3 PNPPh 3 ] + ( 8 ), and [(Ph 2 ClSnCH 2 ) 2 · Br] − [Ph 4 P] + ( 9 ). The formation constant K a for 8 in CDCl 3 solution 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) A) whereas the other interacts with a bridging Cl (Sn(1); Cl(2) 3.000(1) A). In the anion of 8 , the bis(chlorodiphenylstannyl)ethane may be regarded as an unsymmetrical chelate ligand towards Cl(12) (Sn(1)-Cl(12) 2.83(1), Sn(2)-Cl(12) 2.70(1) A).