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 degrees C, 20 h) via sulfur-centered Arbuzov rearrangement to afford the corresponding dianionic tetraalkanesulfonato diorganostannates [R2Sn(OSO2Me)(4)]center dot 2Et(3)NMe [R = n-Pr (1), n-Bu (2)] as well as [n-Bu2Sn(OSO2R1)(4)]center dot 2R(4)(2)N [R-1 = Me, Et, n-Pr; R 2 = 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 Sn-119 NMR spectral studies suggest the existence of pentacoordinated tin species in solution.
Shankar, R., Singh, A. P., Mahon, M. F., Molloy, K. C., Hundal, G., Biesemans, M., & Willem, R. (2008). Recipe for new diorganostannates, [R2Sn(OS(O)(2)R-1)(4)](2-), bearing alkanesulfonate groups using dialkyl sulfite as the reagent. Inorganic Chemistry, 47(3), 790-792. https://doi.org/10.1021/ic702099t