Methylation of 3-methoxytropone with methyl fluorosulphonate to give 1,3-dimethoxytropenylium ion, folowed by reaction with primary amines in the presence of strong base gives 3-aminocycloheptatrienylidenamines which are more stable for arylamino than alkylamino substituents; a similar reaction with 1-methoxy-3-dimethylaminotropenylium ion failed.
M. Cavazza and F. Pietra, J. Chem. Soc., Chem. Commun., 1976, 412 DOI: 10.1039/C39760000412
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