Hydrosilylation of rhodium complex catalyzed alkene in room-temperature ion liquid/super-critical CO2 medium

Abstract

The invention relates to a hydrosilylation of rhodium complex catalyzed alkene in room-temperature ion liquid / super-critical CO2 medium. The technical problem to be solved is characterized in that thehydrosilylation condition is moderate and safe, the reaction conversion rate is high, the outcome Beta-addition product of the hydrosilylation has strong selection, no outgrowth paraffin hydrocarbonis produced, the outcome and the catalyst are convenient to be separated from each other, and the catalyst can be reclaimed and re-utilized. The hydrosilylation is characterized in that the alkene andhydrogen-contained silanes are taken as raw materials, rhodium compound is taken as the catalyst, the potassium tert-butoxide is taken as adjuvant, and the room-temperature ion liquid / supercritical CO2 is taken as reaction medium; and the mixture is heated and mixed so as to react sufficiently, the outcome is collected by reducing pressure, thus obtaining the hydrosilylation products.

Description

technical field [0001] The invention relates to the field of organic chemistry, specifically a room temperature ionic liquid / supercritical CO 2 (IL / scCO 2 The rhodium complex in the ) medium catalyzes the hydrosilylation reaction of alkenes. Background technique [0002] The hydrosilylation reaction catalyzed by unsaturated olefins is one of the most important ways to synthesize organosilicon coupling agents and functional organosilicon compounds and polymers, and plays an important role in organosilicon chemistry and organosilicon industry (Leslie D. Field , Antony J. Ward, J. Organomet. Chem, 2003, 681, 91-97). Karstedt catalyst is the most widely used catalyst in industrial hydrosilylation reaction. But now the common platinum catalyst for hydrosilylation reaction has the disadvantages of low reaction conversion rate and selectivity, and it is easy to generate platinum black during the same reaction (Chisso Corp. JP, 8204995, 1982). Later, through the study of various...

AI Technical Summary

Problems solved by technology

But for some types of hydrosilylation reactions, such as the hydrosilylation of olefins and alkoxysilanes, transition metals (Rh, Ru, etc.) are used as catalysts, and the catalytic activity is not high (Bogdan Marciniec, and Jacek , J. Organomet. Chem., 1983, 253, 349-362)

At the same time, the catalytic system is also difficult to separate, recover and reuse from the reaction system.

Since then, Chen Yuanyin et al. (Meng Lingzhi, Ke Aiqing, Chen Yuanyin, Applied Chemistry, 1997, 14, 1, 107-109; Liu Ying, Chen Yuanyin, Sheng Rongsheng, Molecular Catalysis, 1997, 11, 5, 394-400; Dai Yanfeng, Xiao Bin, Li Fengyi, Ru Xiang, Chemical Reagents, 2005, 27, 12, 707-709) studied the application of Pt on polymer compounds for hydrosilylation reaction, but the preparation of the catalyst is complicated and the reaction activity is not high , it is difficult to apply to industrialization