Preparation, Characterization, and Potentiometric Titrations of Some New Di-[3-(3-alkyl/aryl-4,5- dihydro-1H -1,2,4-triazol-5-one-4-yl)-azomethinphenyl] isophthalate/terephthalate Derivatives

Authors : Haydar YÜKSEK, Özlem Gürsoy KOL

Pages : 773-784

View : 12 | Download : 6

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :3-Alkylinsert ignore into journalissuearticles values(Aryl);-4-amino-4,5-dihydro-1H-1,2,4-triazol-5-ones insert ignore into journalissuearticles values(2); reacted with di-insert ignore into journalissuearticles values(3-formylphenyl); isophthalate insert ignore into journalissuearticles values(3); and di-insert ignore into journalissuearticles values(3-formylphenyl); terephthalate insert ignore into journalissuearticles values(6); to afford the corresponding 6 novel di-[3-insert ignore into journalissuearticles values(3-alkyl/aryl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl);- azomethinphenyl] isophthalates insert ignore into journalissuearticles values(4); and 6 novel di-[3-insert ignore into journalissuearticles values(3-alkyl/aryl-4,5- dihydro-1H-1,2,4-triazol-5-one-4-yl);-azomethinphenyl] terephthalates insert ignore into journalissuearticles values(7);, respectively. The acetylation reactions of compounds 4 and 7 were investigated, and 5 and 8 type compounds were obtained, respectively. The new compounds synthesized were characterized by using IR, 1H-NMR, 13C-NMR, and UV spectral data together with elemental analysis. In addition, to investigate the effects of solvents and molecular structure upon acidity, compounds 4 and 7 were titrated potentiometrically with tetrabutylammonium hydroxide in 5 non-aqueous solvents insert ignore into journalissuearticles values(isopropyl alcohol, tert-butyl alcohol, N,N-dimethylformamide, acetone, and dimethyl sulfoxide);. The half-neutralization potential values and the corresponding pKa values were determined for all cases.
Keywords : 4, 5 Dihydro 1H 1, 2, 4 triazol 5 one, Schiff base, acidity, potentiometric titration, acetylation