An approach to stable organic molecules of the triplet state via organosilicon route

Abstract

Dianions of hexakis(trimethylsilyl)benzene and 1,2,4,5-tetrakis(trimethylsilyl)benzene are described. Although the former has a boat-deformed structure of non-aromaticity with two lithium atoms at the same side of the benzene ring, the latter has a planer structure of antiaromaticity with two lithium atoms at the both side of the benzene ring. The dianion of specially designed hexasilylbenzene with three fused rings shows triplet ESR signals in the temperature range of 100–370 K. © 1994 IUPAC.