E. Opozda, W. Łasocha, B. Włodarczyk-Gajda
Sep 1, 2003
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0
Influential Citations
8
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract Reactions of 2,3-diaminopyridine with 3-(4′-nitrophenyl)-3-oxo-propionaldehyde and 3-ethoxyvinylidene-2,4-pentanedione in ethanol result in either products of condensation 1:1 (1, 3) or 1:2 (2). All Schiff bases were studied by spectroscopic methods. In the crystalline state and in a chloroform solution all the products exist in an enaminone form. The structure of 3-acetyl-4-[N-(2′-aminopyridinyl)-3-amino]-3-buten-2-one (2) was determined by single crystal X-ray method. Crystals are monoclinic, space group P21/n (14), a=7.5780(2), b=8.0310(2), c=17.9590(6) A, β=97.175(1)° with Z=4. X-ray investigations indicate that the condensation takes place in the amino group at 3-position of pyridine ring.