Janovsky reactions were carried out between various η6-substituted benzene-η5- cyclopentadienyliron cations containing at least one electron-withdrawing substituent in the complexed arene and the enolate-carbanion derived from acetone, butanone, or 3- pentanone. Highly colored adducts were obtained from reactions of the cyclopentadienyliron (CpFe) complexes of nitrobenzene, cyanobenzene, p-tolylsulfonylbenzene, ...
[Sutherland, Ronald G.; Chowdhury, Ratan L.; Piorko, Adam; Lee, Choi Chuck Journal of the Chemical Society, Chemical Communications, 1985 , # 19 p. 1296 - 1297]