Three-bridged [2.2.n](1,2,4)cyclophanes 4a and b were obtained by [2+2] photocycloaddition of divinylmetacyclophanes in 21 and 86% yields, respectively. Birch reduction of cyclophanes 4a and b gave [4.4.n](1,2,4)cyclophanes in 45–61% yields.
通过二
乙烯基甲基环烷的[2+2]光环加成,得到了三桥[2.2.n](1,2,4)环烷 4a 和 b,收率分别为 21% 和 86%。环烷 4a 和环烷 4b 的桦木还原反应得到[4.4.n](1,2,4)环烷,收率为 45-61%。