Nuclear magnetic resonance spectrum (1H) of dilithium indeno[1,2-a]indenide (2) and that of the [2,1-a]-isomer (4) indicate unique charge delocalization, which reflects that those dianions consist of two charge delocalized indenides.
二
锂茚并[1,2-a]
茚(2)和[2,1-a]-异构体(4)的核磁共振谱(1H)表明独特的电荷离域,这反映这些二价阴离子由两个电荷离域
茚。