A Highly Regioselective Approach to Multiple Adducts of C60 Governed by Strain Minimization of Macrocyclic Malonate Addends
作者:Uwe Reuther、Torsten Brandmüller、Wolfgang Donaubauer、Frank Hampel、Andreas Hirsch
DOI:10.1002/1521-3765(20020517)8:10<2261::aid-chem2261>3.0.co;2-c
日期:2002.5.17
the macrocyclic malonate. A variety of bis-, tris-, tetra-, and hexaadducts have been synthesized to show the scope of this approach. "Exotic" addition patterns such as trans-4,trans-4,trans-4, which has been synthesized and completely characterized for the first time, are also accessible by this method. The regioselectivity is ruled by the even distribution of the strain within the macrocyclic malonates
通过使二氯丙二酰与链烷二醇反应制备了新的大环丙二酸酯2-5。这些环-[n]-烷基丙二酸酯与C60的反应具有很高的区域选择性。含有相同烷基间隔基的大环选择性地形成具有旋转对称性的C60的双和三加合物。区域选择性形成的低聚加合物的添加方式取决于大环丙二酸酯内烷基间隔基的大小。合成了多种双,三,四和六加合物,以显示该方法的范围。通过这种方法还可以访问“异国情调”添加模式,例如首次合成并完全表征的trans-4,trans-4,trans-4。区域选择性由应变在具有相同长度的间隔链烷烃链的大环丙二酸酯内的均匀分布决定:具有旋转对称性的加成图提供了丙二酸酯氧原子的完全相同的距离,因此仅通过这种方法形成。相反,当使用具有两个不同的烷基间隔长度的大环,例如9和10时,该反应仅产生C(s)-对称的双加合物。