作者:Philippe Schneider、Roland Cloux、Klára Fóti、Ervin sz. Kováts
DOI:10.1055/s-1990-27084
日期:——
N-Silyldimethylamines are efficient silylating agents for the chemical surface modification of hydroxylated silicon dioxide preparations. The synthesis of chloro(5-X-3,3-dimethylpentyl)-dimethylsilanes and their conversion to the corresponding (dimethylamino) silanes are described, where X is a methoxy, methoxymethoxy, cyano or dimethylamino group. The bulky substituent forms a two stage protecting layer at the surface. The second stage hinders the access of nucleophiles to the silicon atom resulting an enhanced hydrolytic stability.
N-硅基二甲基胺是对羟基二氧化硅制剂进行化学表面改性的高效硅烷化剂。本文介绍了氯(5-X-3,3-二甲基戊基)-二甲基硅烷的合成及其转化为相应的(二甲基氨基)硅烷的过程,其中 X 是甲氧基、甲氧基甲氧基、氰基或二甲基氨基。笨重的取代基在表面形成了两级保护层。第二层保护层阻碍了亲核物进入硅原子,从而提高了水解稳定性。