Syntheses of Dialkali Metal Complexes of Tetrakis(dimethylsilyl)ethylene: [(HMe<sub>2</sub>Si)<sub>2</sub>C=C(SiMe<sub>2</sub>H)<sub>2</sub>]<sup>2−</sup>[M<sup>+</sup>(ligand)<sub><i>n</i></sub>]<sub>2</sub>. Evidence for SiH–Alkali Metal Agostic Interactions
methods. Spectroscopic evidence for the interaction of the hydrogen on the silicon atom with alkali metals include (1) an unusually small value of the silicon-hydrogen coupling constant (1JSi–H) in NMR spectra and (2) low-energy Si–H stretchingfrequency in the infrared spectra. The smallest cation, Li+, can interact with SiH most strongly.
Tris(t-butyldimethylsilyl)trimethylsilylethylene and tetrakis(dimethylsilyl)ethylene were prepared. Structures of these most twisted and untwisted olefins are determined by X-ray diffraction.
制备了三(叔丁基二甲基硅烷基)三甲基硅基乙烯和四(二甲基硅烷基)乙烯。通过 X 射线衍射确定了这些最扭曲和非扭曲烯烃的结构。