1-Formylazulenes azulenes

The tri(azulenyl)methane derivative 24+ including a 6-azulenyl group was prepared by the reaction of azulene 6b with diethyl 6-formylazulene-l,3-dicarboxylate. Synthesis of 24+ was accomplished by hydride abstraction with DDQ. Cation 24+ was isolated as a hexafluorophosphate salt by treatment with aqueous HPF6. The new salt is a stable, deep-green colored crystals, that can be... [Pg.184]

It may be mentioned here that 1-formyl- and 1-acetyl-azulene [241] also offer alternative C/O protonation sites, with two carbon alternatives, C-1 and C-3. Nmr spectra show that, in 1-formylazulene,... [Pg.378]

Perchloric acid (s. a, under CrSO ) 1-Formylazulenes from azulenes via 1-ethoxymethyleneazulenium salts... [Pg.181]

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