199446-22-5Relevant academic research and scientific papers
Methylene-bridged tri- and tetratin compounds as Lewis acids
Altmann, Reiner,Jurkschat, Klaus,Schürmann, Markus,Dakternieks, Dainis,Duthie, Andrew
, p. 5716 - 5723 (2008/10/08)
Syntheses of a series of trinuclear tin compounds, (Ph2XSnCH2)2SnXPh (2, X = Ph; 6, X = F; 8, X = Cl) and (PhCl2SnCH2)2SnCl2 (10) and tetranuclear tin compounds (Ph2XSnCH2-SnXPh)2CH2 (3, X = Ph; 7, X = F; 9, X = Cl) are reported, and the crystal structure of [(Ph2FSnCH2)2SnFPh·F]-[C 12H24O6·K]+ (6b) is described. Variable temperature 119Sn and 19F NMR studies indicate that the structure observed for the anion in 6b in the solid state is retained in solution. There is no NMR evidence for the formation of 1:2 adducts with fluoride ion, although such species are identified in acetonitrile solutions from electrospray mass spectrometry (ESMS). 119Sn NMR spectral data indicate that reaction of trinuclear tin compound 8 with [(Ph3P)2N]+Cl- and HMPA results in formation of the 1:1 complexes [(Ph2ClSnCH2)2SnClPh·Cl] -[(Ph3P)2N]+ (8a) and (Ph2ClSnCH2)2SnClPh·[(CH 3)2N]3PO (8b), respectively. In contrast, 19F and 119Sn NMR data show that the tetranuclear tin compound 7 reacts with fluoride ion to give a stable 1:2 adduct [(Ph2FSnCH2SnFPh)2CH 2·2F]2-2[Bu4N]+ (7b) in solution, being no NMR evidence for formation of a 1:1 adduct. However, ESMS indicates the presence of both 1:1 and 1:2 adducts in acetonitrile solution.
