Novelperalkylcyclotetrasilanes of the type (R1R2Si)2(R1= R2= ButCH2, R3= R4= Pri; R1= R2= ButCH2, R3= But, R4= Me) were obtained by co-condensation of two 1,2-dichlorotetra-alkyldisilanes with Li; the structure of the tetraisopropyltetraneopentylcyclotetrasilane (1), determined by X-ray crystallography, is folded with a large dihedral angle.
所述类型的新颖peralkylcyclotetrasilanes(R 1 - [R 2 Si)的2(R 1 = R 2 =卜吨CH 2,R 3 = R 4 = PR我; R 1 = R 2 =卜吨CH 2,R 3 =卜吨,通过将两个1,2-二氯四烷基二硅烷与Li共缩合得到R 4 = Me);通过X射线晶体学测定的四异丙基四戊基戊基环四硅烷(1)的结构以大的二面角折叠。
<i>Z</i>-1,2-Bis(<i>t</i>-butyldimethylsilyl)-1,2-bis(trimethylsilyl)ethylene. The Most Crowded Known cis-Olefin
Z-1,2-Bis(t-butyldimethylsilyl)-1,2-bis(trimethylsilyl)ethylene was prepared, the structure being determined by X-ray crystallography. Remarkably, the compound is fixed to cis configuration and a considerable pyramidarization occurs at olefinic carbons with large twisting of the double bond.
我们制备了 Z-1,2-双(叔丁基二甲基硅基)-1,2-双(三甲基硅基)乙烯,并通过 X 射线晶体学确定了其结构。值得注意的是,该化合物固定为顺式构型,并且在烯烃碳原子上发生了相当程度的金字塔化,双键发生了很大的扭曲。