The structure of 2,2-di-t-butyl-1,3,2-dioxa-, oxathia-, and dithia-stannolanes: a study by solution and solid state NMR and single crystal X-ray diffraction

Article abstract of DOI:10.1016/0022-328X(89)88040-4

X-Ray diffraction shows that 2,2-di-t-butyl-1,3,2-dioxastannolane exists as a 5-coordinate dimer.The corresponding oxathiastannolane is similarly dimerised through oxygen, but in the crystalline phase the dithiastannolane is a 4-coordinate monomer.Comparison of the 117/119Sn NMR spectra of the compounds as solids and in solution shows that in solution, the dioxastannolane retains its dimeric structure, but the dimeric oxathiastannolane is in equilibrium with the monomer, and the dithiastannolane is a simple monomer.