Chemistry Letters p. 169 - 170 (1995)
Update date:2022-08-10
Topics:
Ueno, Tetsuya
Toda, Haruhiko
Yasunami, Masafumi
Yoshifuji, Masaaki
1-Fluoro- and 1,3-difluoroazulenes were synthesized by the reaction of azulene with N-fluoropyridinium salts in acetonitrile.Methyl azulene-1-carboxylates were also fluorinated to give the corresponding 3-fluoro derivatives.On the basis of the UV-visible acsorption spectra, the fluorine atom acts as an electron-donating group to the azulene ?-system due to the +I? effect.
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