Studies in aryltin chemistry. X 1. Synthesis and NMR spectra (119Sn and 13C) of some meta-and ortho-substituted tetra-and triaryltin compounds. The crystal and molecular structures of tris(m-tolyl)-and tris(3,5-dimethylphenyl) tin(IV) chloride

Article abstract of DOI:10.1016/S0022-328X(96)06782-4

Several new tetra-aryltin compounds, Ar₄Sn [Ar = 3,5-(CH₃)₂C₆H₃, 3,5-Z₂C₆H₃, and m-ZC₆H₄ (Z = F, Cl)] and Ar₃SnX [X = Cl, Br, I: Ar = 3,5-(CH₃)₂C₆H₃, m-and o-CH₃OC₆H₄; X = Br; Ar = m-ZC₆H₄ (Z = F, Cl)] have been synthesized by literature methods and complete solution NMR data (¹¹⁹Sn, ¹³C) are reported for these and other meta-and ortho-substituted aryltins. Meta-substituents appear to exert electronic effects on chemical shifts and coupling constants, but for ortho-substituents steric effects appear to predominate. Crystal data show that meta-substituted Ar₃SnX have trigonal unit cells in contrast to the monoclinic unit cells adopted by para-and ortho-substituted Ar₃SnX. Complete crystal structures are reported for (m-CH₃C₆H₄)₃SnCl: R3, a= 14.9262(15), c = 7.3482(12)A, Z=3 and (3,5-(CH₃)₂C₆H₃)₃SnCl: R3c, a = 15.779(8), c = 15.593(4)A, Z = 6. In both cases, all molecules have trigonal symmetry, the first such examples to be reported.