An intramolecular coupling of 1,6-bis(5-oxohepta-1,3-dien-6-ynyl)cyclohepta-1,3,5-triene under Glaser conditions affords 12,15-dichloro-13,14-didehydro-1,6-methano[20]annulene-11,16-dione, which exhibits strong diatropicity in D2SO4, suggesting the formation of the highly delocalized dicationic species.
在格拉塞条件下,1,6-双(5-氧代
庚烷-1,3-二烯-6-炔基)
环庚烷-1,3,5-
三烯发生分子内偶联,生成 12,15-二
氯-13,14-二脱氢-1,6-甲桥[20]庚烯-11,16-二酮。