The fragmentation reaction in the mass spectrometer of several 1-substituted azulene compounds are discussed. For all studied compounds the break of the bonds conserves the charge at the azulenic moiety. The differences and resemblances to the known corresponding aromatic derivatives are evidenced and discussed.

3,3'-Disubstituted 1,1'-biazulene derivatives were dissolved in good yields starting from the dimmers of azulene-1-azo aromatic compounds and from the corresponding Schiff bases coupled at 3 positions.

Azulene-1-azo-(3' and 4'-pyridines) were synthetised from azulenes and diazotized aminopyridines. the mechanism for the generation of the diazonium salt was discussed. The obtained azulene-1-azo pyridines were alkylated with alkyl, benzyl and allyl halides.

Some new substituted azulene-1-azo-(4-nitrobenzenes) were synthetised using the nitrozation in concentrated sulphuric acid. The mechanism of the nitrozation is discussed suggesting the generation of sulfamic acid as intermediate. The obtained compounds are completely characterised.

N-(Azulen-1-ylmethylene)arylamines were obtained in a fast quantitative convesion and high yield from the condensation of the corresponding azulene-1-carbaldehydes with aromatic amines without solvent. The reactions of the Schiff bases obtained were compared with those of the corresponding azo compounds which have already been studied. The lack of regioselectivity in the oxidation of imines with anhydrous ferric chloride at both the azulenyl and

The present investigation represents a study of the halogenation of 1-arylazo-azulene with elemental halogens, with NBS and with cupric halides with a view to synthesize the halogenated compounds and to establish the reaction mechanism. The mechanism for the cupric halides appears to involve a ligand transfer from copper to azulene.

Several derivatives belonging to a new compound class, namely azulene-1-azo-2'-thiazoles, were prepared by the diazotization of 2-aminothiazoles in the presence of HNO3/H3PO4 followed by the couping o diazonium salts with azulene in buffered medium. The reactions proved to be general for this class, the yields are, however, considerabely influenced by the substituents at thiazole moiety. For the first time a N-oxide provided from an amino substituted