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The title compound, 2,6-bis(1-azaazulen-2-yl)pyridine (5), was synthesized by condensation between tropone (6) and 2,6-bis(pyridinioacetyl)pyridinium salt (7) in the presence of ammonium acetate. By slow addition of an acetic acid solution of the pyridinium salt 7 to a mixture of 6 and ammonium acetate the yield of 5 was improved. Physical properties of 5 were investigated. It is worthy to note that upon irradiation 5 shows strong emission in acidic media in contrast to very weak emission in neutral media.

Unusually Efficient Deformylative Synthesis of 1,2,8,9-Tetrasubstituted Dipyrrins from 4,5-Disubstituted Pyrrole-2-carbaldehydes. -The dipyrrins (IV) obtained show a clear color change from red to blue when exposed to Broensted acids. -(ODA*, M.; FUJIWARA, Y.; KUMAI, Y.; OHTA, A.; MIYATAKE, R.; Heterocycles 90 (2015) 1, Special Issue, 238-251, http://dx.doi.org/10.3987/COM-14-S(K)10 ; Dep. Chem., Fac. Sci., Shinshu Univ., Matsumoto, Nagano 390, Japan; Eng.) -A. Forchert 20-126