The title compounds have been synthesized by Li and Grignard reactions. The crystal structure of Ph3Si-p-Tol has been determined. The substitution of only one phenyl by one p-tolyl group causes only a slight deviation from the ideal S4 symmetry of Ph4Si. Gradual replacement of phenyl by p-tolyl groups leads to increasing low field shifts for all 13C(ipso) atoms. The substitution of the first phenyl
通过Li和Grignard反应合成了标题化合物。已经确定了Ph 3 Si- p- Tol的晶体结构。一个
对甲苯基基团仅取代一个苯基,仅导致与Ph 4 Si的理想S 4对称性略有偏离。
对甲苯基逐渐取代苯基会导致所有13个C(ipso)原子的低场移增加。Ph 4 Si和Ph 4 Sn中的
对甲苯基取代第一个苯基会导致δ(29 Si)(-0.3 ppm)和δ(119)都发生高场移Sn)(-1 ppm)。进一步的取代显示出几乎线性的依赖性(每个
对甲苯基基团的δδ(29 Si)= -0.1 ppm,Δδ(119 Sn)= + 1.5 ppm )。