Preparation of Tetraphenylazulenequinodimethanes from the Reactions of Azulenequinones with Diphenylketene and the ^1H NMR and UV-vis Spectral Studies in Acidic Media
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3-Bromo-1,5-azulenequinone and 3-bromo-1,7-azulenequinone reacted with diphenylketene to give the corresponding tetraphenylazulenequinodimethane, which has both diphenylfulvene and diphenylheptafulvene structures. The protonation occurred at the diphenylmethylene group on the seven-membered ring to form a cycloheptatrienylium ion.
- Chemistry Letters
Chemistry Letters 1997(8), 689-690, 1997-08
The Chemical Society of Japan