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The Method for Preparing Phenyl Silane

2019/04/19
At present, there are about 300 kinds of silanes that can be produced in China. According to different functional groups, it is mainly classified into sulfur, crosslinker, amino group, epoxy group, vinyl group, acryloyloxy group and the like. The rest of the products such as saturated alkanes, phenyl, alpha silane and silane secondary processing products are also available in many varieties, but the yield is not large.

Phenyl silane is a chemical used to synthesize silicone intermediates. Its molecular formula is: C6H5SiH3. Its flash point is 8 °C. It is insoluble in water and looks like a clear, colorless liquid.

The relative density of phenyl silane is 0.661, and the refractive index is 1.5125. Under the action of concentrated sulfuric acid and aluminum trichloride, the chemical bonds in the molecule are broken. Under the action of alcohol and alkali, the Si-H bond is hydrolytically cleaved to release hydrogen. Phenylsilane can be obtained by reduction of phenyl-dichlorosilane with hydrazine hydride or tetrahydrofuran aluminum.

A method of preparing a phenyl silane comprising the steps of:
Trichlorobenzenesilane was slowly added from the dropping funnel in a tetrahydrofuran solution in which lithium tetrahydrogenate was dissolved. The molar ratio of trichlorobenzenesilane to lithium tetrahydrogenate was controlled to be 3:1. The reaction was carried out at -10 to 0 ° C, and after completion of the reaction by the TLC method, the product was added to a dilute sulfuric acid solution under ice bath. The organic layer was extracted, and phenyl silane was distilled off under reduced pressure. The purity of the phenyl silane was 98.0%.