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On animation and Diazotization of Azulene and Its Derivatives

Mąkosza M., Osiński P. W., Ostrowski S.

Polish Journal of Chemistry

2001

Vol. 75, nr 2

275-281

A practical procedure for synthesis of 6-aminoazulene (3) via Vicarious Nucleophilic Substitution of Hydrogen (VNS) amination of azulene with 4-amino-1,2,4-triazole is reported. Amination with use of N,N,N-trimethylhydrazinium iodide (TMHI) of more electrophilic azulene derivatives, substituted at position 1- with CN or COPh group, afforded a mixture of 4-, 6-, and 8-aminoazulenes. Attempts to convert 6-aminoazulene (3) into diazonium salt failed, only formation of small quantities of the "auto-coupling" product, 1-(azulen-6-ylazo)-azulen-6-yl-amine, was observed.