Synthesis and Characterization of Two Isomers of 14π-Electron Germaaromatics: Kinetically Stabilized 9-Germaanthracene and 9-Germaphenanthrene

The first stable 9-germaanthracene and 9-germaphenanthrene were successfully synthesized by taking advantage of kinetic stabilization utilizing effective steric protection groups, Tbt and Bbt groups (Tbt = 2,4,6-tris[bis(trimeth-ylsilyl)methyl]phenyl, Bbt = 2,6-bis[bis(trimethylsilyl)methyl]-4-[tris(trimethylsilyl)methyl]phenyl). The similarities and differences of the structures and properties between the two
isomers of germaaromatics are discussed.

本研究通过采用动力学稳定化策略，利用高效空间位阻保护基Tbt与Bbt基团（Tbt = 2,4,6-三[双(三甲基硅基)甲基]苯基，Bbt = 2,6-双[双(三甲基硅基)甲基]-4-[三(三甲基硅基)甲基]苯基），成功合成了首例稳定的9-锗蒽（9-germaanthracene）与9-锗菲（9-germaphenanthrene）。本文还探讨了这两种锗芳香族异构体在结构与性质上的异同。