STUDIES IN ARYLTIN CHEMISTRY .10. SYNTHESIS AND NMR-SPECTRA (SN-119 AND C-13) OF SOME META-SUBSTITUTED AND ORTHO-SUBSTITUTED TETRATIN AND TRIARYLTIN COMPOUNDS - THE CRYSTAL AND MOLECULAR-STRUCTURES OF TRIS(M-TOLYL)TIN AND TRIS(3,5-DIMETHYLPHENYL)TIN(IV) CHLORIDE

Several new tetra-aryltin compounds, Ar4Sn [Ar = 3,5-(CH3)(2)C6H3, 3,5 -Z(2)C(6)H(3), and m-ZC(6)H(4) (Z = F, Cl)] and Ar3SnX [X = Cl, Br, I: Ar = 3,5-(CH3)(2)C6H3, m- and o-CH3OC6H4; X = Br; Ar = m-ZC(6)H(4) (Z = F, Cl)] have been synthesized by literature methods and complete so lution NMR data (Sn-119, C-13) are reported for these and other meta- and ortho-substituted aryltins. Meta-substituents appear to exert elec tronic effects on chemical shifts and coupling constants, but for orth o-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 Ar3Sn X. Complete crystal structures are reported for (m-CH3C6H4)(3)SnCl: R3 , a = 14.9262(15), c = 7.3482(12)Angstrom, Z = 3 and (3,5-(CH3)(2)C6H3 )(3)SnCl: R3c, a = 15.779(8), c = 15.593(4)Angstrom, Z = 6. In both ca ses, all molecules have trigonal symmetry, the first such examples to be reported.