180129-07-1Relevant articles and documents
The First synthesis of 1-Fluoro- and 1,3-Difluoroazulenes
Ueno, Tetsuya,Toda, Haruhiko,Yasunami, Masafumi,Yoshifuji, Masaaki
, p. 169 - 170 (1995)
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.