Well-defined, rigid molecular domes are obtained via substitution of the chlorine atoms of hexachlorobenzotrinorbornadiene syn-3, efficiently synthesized in 1:2 ratio along with its anti-isomer by CuTC-promoted cyclotrimerization of 3-bromo-2-trimethylstannylnorbornadiene 8. The three dichlorovinyl functions at the edge of syn-3 are displaced by sulfur nucleophiles and Grignard reagents with Ni(II)Cl2dppe as catalyst, gaining the persubstituted vinyl sulfides 9 and 10, and persubstituted methyl 12 and phenylethynyl 13.
通过用
氯原子替换
六氯苯并
三环烯 syn-3 中的
氯原子,可以获得定义明确、刚性的分子穹顶。该化合物与其反式异构体以1:2的比例通过
铜催化的环三聚化反应有效合成,反应物为3-溴-2-
三甲基锡诺布烯 8。syn-3 边缘的三个二
氯乙烯基功能团被
硫核苷和格林亚德试剂取代,催化剂为 Ni(II)Cl2dppe,最终得到全取代的
乙烯基硫化物 9 和 10,以及全取代的甲基 12 和
苯乙炔 13。