The title Ï-extended TTF derivatives 1 and 2 were prepared from the corresponding diketones by WittigâHorner reactions. Donor 1 with a naphthalene-1,8-diyl skeleton adopts a butterfly-shaped geometry; its oxidation caused transannular CâC bonding to give the dicationic cyclopropane derivative 42+2+2+, from which 1 was regenerated upon 2e-reduction. The 2,3-diyl isomer 2 possesses, on the other hand, an almost planar Ï-system and underwent 2-stage 1e-oxidation, thus allowing the isolation of both 2Ë+++ and 22+2+2+ as stable salts.
标题α-延伸的
TTF衍
生物1和2是通过Wi
TTig-Horner反应从相应的二酮制备的。具有
萘-1,8-二基骨架的给体1采用蝴蝶形几何形状;它的氧化引起跨环C-C键合,得到双阳离子
环丙烷衍
生物42+2+2+,其中1在2e-还原后再生。另一方面,2,3-二基异构体 2 拥有几乎平面的 α-系统,并经历了 2 阶段 1e-氧化,因此可以分离 2α+++ 和 22+2+2+稳定的盐。