Bu-Ali Sina University

About: Bu-Ali Sina University is a education organization based out in Hamadan, Hamadān, Iran. It is known for research contribution in the topics: Catalysis & Adsorption. The organization has 4078 authors who have published 7969 publications receiving 122828 citations.

Excess Molar Enthalpies of N,N-Dimethylformamide + Alkan-1-ols (C1−C6) at 298.15 K

Abstract: Excess molar enthalpies, , for the binary systems N,N-dimethylformamide + methanol, + ethanol, + propan-1-ol, + butan-1-ol, + pentan-1-ol, and + hexane-1-ol have been measured at 298.15 K and atmospheric pressure with a Parr 1455 solution calorimeter. While the excess molar enthalpies are negative for the methanol mixture, those for ethanol, propan-1-ol, butan-1-ol, pentan-1-ol, and hexan-1-ol mixtures are positive over the entire range of composition of N,N-dimethylformamide. The values at around x ≈ 0.5 follow the order methanol < ethanol < propan-1-ol < butan-1-ol < pentan-1-ol < hexan-1-ol. The experimental results are explained on the basis of possible hydrogen-bonding between unlike molecules. The experimental data have been correlated using Redlich−Kister polynomials, and parameters from least-squares analysis have been reported.

Synthesis of 6-amino-4-(4-methoxyphenyl)-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles using disulfonic acid imidazolium chloroaluminate as a dual and heterogeneous catalyst

Abstract: In this work, disulfonic acid imidazolium chloroaluminate {[Dsim]AlCl4} is applied as a new acidic and heterogeneous catalyst for green, simple and efficient synthesis of 6-amino-4-(4-methoxyphenyl)-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles by the one-pot multi-component condensation of aryl aldehydes with ethyl acetoacetate, malononitrile and hydrazine hydrate at 80 °C under solvent-free conditions.