Synthesis and Reactivity of Novel Bis(stannyl)silanes
2014
Bleckmann, P. | Englich, U. | Hermann, U. | Prass, I. | Ruhlandt-Senge, K. | Schürmann, M. | Schwittekh, C. | Uhlig, F.
Bis(stannyl)silanes of types R₃Sn-SiR′₂₋SnR₃ and R₂(H)Sn-SiR′₂-Sn(H)R₂ with R′ being methyl, phenyl, iso-propyl or terf-butyl have been synthesized by treatment of difunctionalized diorganosilanes with alkali stannides (R = Me, ᵗBu; R′= Me, ⁱPr; 1 - 6, 8) or with triphenyltin chloride and magnesium (R = Ph; R′ = Me, ⁱPh;Pr; 7, 9). Me₃Sn-SiᵗBu₂-SnMe₃ 4, was halogenated using SnCl₄, to yield the bis(chlorostannyl)silane 11. The reaction of bis(stannyl)diorganosilanes R₃SnSiR′SnR₃ with catalytic amounts of Pd(PPh₃)₄ resulted in unexpected rearrangements under formation of the silyldistannanes R₃SnSnR₂SiR′R₂. These compounds undergo addition reactions with alkynes. All compounds have been identified by NMR, IR, MS and elemental analysis. Compounds 5, 6 and 7 have also been characterized by X-ray crystallography.
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