Matrix IR spectroscopic study of the vacuum pyrolysis of octamethylcyclotetrasiloxane, allyloxy- and allyl(allyloxy)dimethylsilanes as well as 2,2,6-trimethyl-2-silapyrane as potential sources of dimethylsilanone
The mechanism of vacuum pyrolysis of octamethylcyclotetrasiloxane, allyloxy- and allyl(allyloxy)-dimethylsilanes, and 2,2,6-trimethyl-2-silapyrane, potential sources of transient dimethylsilanone, has been studied by matrix isolation IR spectroscopy. Only in the case of allyloxydimethylsilane is there direct evidence of silanone (CH3)2SiO formation, by observation of its most intense band at 798 cm−1
通过基质分离红外光谱研究了八甲基环四硅氧烷,烯丙氧基和烯丙基(烯丙氧基)-二甲基硅烷以及2,2,6-三甲基-2-甲硅烷基烷(瞬态二甲基硅酮的潜在来源)的真空热解机理。仅在烯丙氧基二甲基硅烷的情况下,通过在热解产物的基质红外光谱中观察到其在798 cm -1处的最强谱带,才能直接发现硅酮(CH 3)2SiO的形成。在所有其他情况下,发现中间体(CH 3)2 Si = O是热不稳定的,会分裂为SiO分子和CH 3自由基,因此表明硅烷酮参与了所研究的反应。
[EN] COBALT CATALYSTS AND THEIR USE FOR HYDROSILYLATION AND DEHYDROGENATIVE SILYLATION<br/>[FR] CATALYSEURS DE COBALT ET LEUR UTILISATION POUR L'HYDROSYLATION ET LA SILYLATION DÉSHYDROGÉNATIVE
申请人:MOMENTIVE PERFORMANCE MAT INC
公开号:WO2015077304A1
公开(公告)日:2015-05-28
Disclosed herein are cobalt complexes containing terpyridine ligands and chelating alkene-modified silyl ligands, and their use as hydrosilylation and/or dehydrogenative silylation and crosslinking catalysts. The cobalt complexes also exhibit adequate air stability for handling and manipulation.