In contrast to 1-phenylethyllithium, which reacts as a base, methyllithium attacks the silicon atom of 1,1-dimethyl-2-phenyl-silacyclopentane (7) as a nucleophile whereby ring-opening takes place presumably via an ate-complex intermediate. The primarily formed benzyllithium compound in THF immediately metallates the benzylic position of the still unchanged starting material7, finally yielding an equimolar
与作为碱反应的1-苯基
乙基锂相反,
甲基锂攻击作为亲核试剂的
1,1-二甲基-2-苯基-
硅环戊烷(7)的
硅原子,由此开环可能是通过一种络合物发生的。在THF中主要形成的苄基
锂化合物立即使仍未改变的起始原料7的苄基位置
金属化,最终产生
金属化的1,1-二甲基-2-苯基-
硅环戊烷和1-苯基-4-三甲基甲
硅烷基-
丁烷的等摩尔混合物。