Peralkylated 3,4-bis(alkylidene)-1,2-disilacyclobutanes prepared by convenient synthetic route were quantitatively converted to 3,4,7,8-tetrakis(alkylidene)-1,2,5,6-tetrasilacyclooctane (twist and chair 1:1 mixture) by Pd-catalyzed reaction. In the presence of unsaturated compounds, this disilane metathesis reaction was inhibited to give double silylation products. The reaction pathways are highly dependent upon electronic factors of unsaturated compounds and the catalyst.
通过简便的合成路线制备的过烷基化 3,4 双(亚烷基)-1,2-二
硅氧烷环丁烷在
钯催化反应下定量转化为 3,4,7,8 四(亚烷基)-1,2,5,6-四
硅氧烷环辛烷(捻和椅 1:1 混合物)。在存在不饱和化合物的情况下,这种二
硅烷偏合成反应受到抑制,生成双
硅烷化产物。反应途径在很大程度上取决于不饱和化合物和催化剂的电子因素。