The Michael Reactions of Chloro-substituted-9,9′-bifluorenylidenes with Fluorenes and a Comparison with Analogous Halogen Compounds
作者:Masahiro Minabe、Kazuo Suzuki
DOI:10.1246/bcsj.48.586
日期:1975.2
The Michael reactions of 2-chloro- and 2,7-dichloro-9,9′-bifluorenylidenes with fluorenes were investigated. Structures of these products were confirmed by syntheses through the well-established reactions of 9-lithiofluorenes and 9-bromo-9,9′-bifluorenyls. The formation of some abnormal compounds is explained by intermediary formation of 2,7-dichloro-9,9′-bifluorenylidene from the reaction of 9,9′-bifluorenylidene