Alkynylsilanes and alkynyl(vinyl)silanes. synthesis, molecular structures and multinuclear magnetic resonance study

摘要

Alkynylsilanes bearing one to four alkynyl groups at silicon, with organyl groups (Me, Ph, Vin), H, Cl at silicon, and with substituents H, ~nBu, ~tBu, Ph, C_6H_4-4-Me, 3-thienyl, CH _2NMe_2 at the C=C bond, were prepared, and their ~(13)C and ~(29)Si NMR data are reported. The results of X-ray structure analyses of three representative derivatives [di(phenylethynyl) dimethylsilane, di(phenylethynyl) methyl(phenyl)silane, and tri(phenylethynyl) methylsilane] are presented. The chemistry of mono-and dialkynylsilanes was further developed to prepare compounds with alternating Si atoms and C=C bonds, affording new dialkynylsilanes as well as numerous new vinylsilanes which have also been characterized by ~(13)C and ~(29)Si NMR spectroscopy in solution. In the case of ethynyl(triphenylsilylethynyl) dimethylsilane, the molecular structure was determined by X-ray diffraction.