American Chemical Society
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Recipe for New Diorganostannates, [R2Sn(OS(O)2R1)4]2-, Bearing Alkanesulfonate Groups Using Dialkyl Sulfite as the Reagent

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journal contribution
posted on 2008-02-04, 00:00 authored by Ravi Shankar, Atul Pratap Singh, Mary F. Mahon, Kieran C. Molloy, Geeta Hundal, Monique Biesemans, Rudolph Willem
A one-pot reaction between di-n-propyl/di-n-butyltin oxide, dialkyl sulfite, and triethylamine or tetra-n-alkylammonium iodide proceeds under ambient conditions (110−120 °C, 20 h) via sulfur-centered Arbuzov rearrangement to afford the corresponding dianionic tetraalkanesulfonato diorganostannates [R2Sn(OSO2Me)4]·2Et3NMe [R = n-Pr (1), n-Bu (2)] as well as [n-Bu2Sn(OSO2R1)4]·2R24N [R1 = Me, Et, n-Pr; R2 = Et (3, 5, and 7), n-Bu (4, 6, and 8)]. X-ray crystal structures of 2 and 3 reveal a monomeric motif of the dianion, with methanesulfonate groups acting as unidentate ligands. The 119Sn NMR spectral studies suggest the existence of pentacoordinated tin species in solution.