An improved method of preparing an ortho-, meta- or para-silyl aromatic or heteroaromatic compound represented by the formula ##STR1## wherein X is oxygen or sulfur, R.sub.1 represents the atoms necessary to complete an unsubstituted or substituted aromatic or heteroaromatic ring, and R.sub.2, R.sub.3 and R.sub.4 individually are unsubstituted or substituted alkyl groups, includes the steps of reacting an ortho-, meta-, or para-bromo aromatic or heteroaromatic compound represented by the formula ##STR2## with an excess of a silylating agent; removing excess reagent, solvent, and/or by-products; adding an organic solvent that is compatible with a preselected metallizing agent; cooling the resulting reaction mixture; adding the metallizing agent in an organic solvent to the reaction mixture dropwise to form a metallized intermediate; mixing the resulting reactants and monitoring the reaction until reaction completion; and then stopping the reaction before the formation of a significant amount of alkylated by-product.
一种改进的制备ortho-, meta-或para-
硅基芳香族或杂芳香族化合物的方法,该化合物由以下式子表示:##STR1## 其中X是氧或
硫,R.sub.1代表完成未取代或取代芳香族或杂芳香族环所需的原子,R.sub.2、R.sub.3和R.sub.4分别是未取代或取代的烷基基团,包括以下步骤:将由以下式子表示的ortho-, meta-,或para-
溴代芳香族或杂芳香族化合物与过量的
硅化试剂反应;去除多余试剂、溶剂和/或副产物;添加与预选的
金属化试剂相容的有机溶剂;冷却所得的反应混合物;滴加
金属化试剂在有机溶剂中到反应混合物中形成
金属化中间体;混合反应物并监测反应直至反应完成;然后在生成大量烷基化副产物之前停止反应。