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oai:ojs.www.eurjchem.com:article/733 2013-03-30T23:10:27Z eurjchem:ART driver

An efficient route for the synthesis of some monoazo disperse dyes derived from nicotinic acid derivatives Alnajjar, Abdulaziz Alsaiedi, Marzouq El-Apasery, Morsy Ahmed Enaminones Nicotinic acid Disperse dyes Arylhydrazonals Dye intermediates Arylazonicotinates Ethyl 2-amino-3-cyano-4-phenylnicotinates (8), could be readily synthesized via reacting ethyl propiolate with benzylidenemalononitrile in the presence of L-proline as a catalyst and subsequent rearrangement of the so formed 2-aminopyran (7), with acetic acid in the presence of ammonium acetate. A series of 2-amino and 2-hydroxyarylazonicotinates monoazo disperse dyes (12a-c), were prepared in a good yields via condensation of arylhydrazonals (11a-c), with active methylene nitriles. The compound 9 was also characterized by single crystal X-ray diffraction studies. Crystal data for compound 9, C15H18O6 (M = 294.29): hexagonal, space group P65 (no. 170), a = 11.3311(5) Å, c = 19.5375(10) Å, V = 2172.42(18) Å3, Z = 6, T = 296(2) K, μ(MoKα) = 0.879 mm-1, Dcalc = 1.350 g/mm3, 4546 reflections measured (9.02 ≤ 2Θ ≤ 132.96), 2271 unique (Rint = 0.0921) which were used in all calculations. The final R1 was 0.0686 (>2σ(I)) and wR2 was 0.1691 (all data). Atlanta Publishing House LLC 2013-03-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf text/plain https://www.eurjchem.com/index.php/eurjchem/article/view/733 10.5155/eurjchem.4.1.53-57.733 European Journal of Chemistry; Vol. 4 No. 1 (2013): March 2013; 53-57 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/733/PDF https://www.eurjchem.com/index.php/eurjchem/article/view/733/2546