GÜRSOY KOL, Özlem Kafkas Üniversitesi - Fen‐Edebiyat Fakültesi - Kimya Bölümü, Turkey , OCAK, Zafer Kafkas Üniversitesi - Eğitim Fakültesi - Ortaöğretim Fen ve Matematik Alanları Eğitimi Bölümü, Turkey , YÜKSEK, Haydar Kafkas Üniversitesi - Fen‐Edebiyat Fakültesi - Kimya Bölümü, Turkey

Non‐Aqueous Medium Titrations of Some 3‐Alkyl(Aryl)‐4‐(3‐acetoxybenzylidenamino)‐4,5‐dihydro‐1H‐1,2,4‐triazol‐5‐ones

25543

The acidic properties of seven 3‐alkyl(aryl)‐4‐(3‐acetoxy benzylidenamino)‐4,5‐dihydro‐1H‐1,2,4‐triazol‐5‐ones were investigated. Due to very low solubility of 4,5‐dihydro‐1H‐1,2,4‐triazol‐5‐one derivatives in water, nonaqueous media were used. The titrations in non‐aqueous media have increasingly utilized in recent years. In determining the solvents used, their belonging to different solvent groups, wide use as solvent in non‐aqueous investigations and having different autoprotolysis constants were considered. In non‐qaueous medium, isopropyl alcohol and tert‐butyl alcohol among the amphiprotic type, and aceton and N,N‐dimethylformamide among the dipolar aprotic type were preferred as solvent. The results obtained from the titrations are presented in tables and graphs. Typical S‐shaped titration curves are observed in the graphs. The acidity constants of the compounds in the solvents chosen were calculated using the graphs and the data obtained with half‐neutralization method. The acidity strength of the compounds was observed to differ from the information obtained. The acidity strength of 1 type compounds with varying R groups in different solvents, dielectric constant of the solvents, autoprotolysis constant and leveling‐differentiation effects were investigated.

518

1 , 2 , 4‐triazol‐5‐one , Non‐aqueous media , Titrations , pKa values , Half‐neutralization method

Journal Of Natural an‎d Applied Sciences

523