New pyridazine derivatives: Synthesis, chemistry and biological activity
作者:Roxana M. Butnariu、Ionel I. Mangalagiu
DOI:10.1016/j.bmc.2009.02.028
日期:2009.4
concerning synthesis, structure and biological activity of some new pyridazinederivatives. Syntheses have been done both under classical conditions and microwave [in liquid phase and interphasic transfer catalysis (PTC)]. The MW induced a remarkable acceleration for the [3+2] dipolar cycloaddition reaction of pyridazinium ylides to activated alkenes and alkynes, the yields were increased in some cases
Pyrrolodiazine derivatives as blue organic luminophores: synthesis and properties. Part 3
作者:Gheorghita N. Zbancioc、Thomas Huhn、Ulrich Groth、Calin Deleanu、Ionel I. Mangalagiu
DOI:10.1016/j.tet.2010.04.050
日期:2010.6
irradiation, in liquid phase, is reported. Under MW irradiation the yields are much higher, sometimes substantially (by almost double) and, the amount of solvent used is at least 5-fold less. The pyrrolopyridazine (PP) derivatives are very intense blue emitters and have high quantum yields (up to 90%) while pyrrolophthalazine (PHP) compounds are still intense blue emitters but the quantum yield is negligible
An efficient and selective route to hybrid trifluoromethyl-substituted γ-lactones or fused nitrogen derivatives via cascade reactions
作者:Roxana Tucaliuc、Valeriu V. Cotea、Costel Moldoveanu、Gheorghita Zbancioc、Calin Deleanu、Peter G. Jones、Ionel I. Mangalagiu
DOI:10.1016/j.tetlet.2011.09.093
日期:2011.11
A straightforward, efficient and selective route for obtaining hybrid trifluoromethyl-substituted γ-lactones and fused nitrogen heterocycles is presented. The reaction could be guided either to γ-lactones with a nitrogen-containing heterocyclic skeleton (for monocyclic systems) or to fused nitrogen heterocycles (for fused bicyclic systems). A new class of γ-lactone with a nitrogen heterocyclic skeleton
Corrosion inhibition of carbon steel in 1.0 M HCl was investigated in the absence and the presence of different concentrations of 1-(2-(4-chlorophenyl)-2-oxoethyl)pyridazinium bromide (CPEPB). This inhibitive action against the corrosion of carbon steel in 1.0 M HCl solution was investigated at 298 K using gravimetric and electrochemical measurements. The effect of temperature on the corrosion behavior with the addition of CPEPB in the range of temperature from 298 to 328 K. The inhibition efficiency decreases slightly with the increase in the temperature. Results show that CPEPB is a good inhibitor and inhibition efficiency reach 91% at 10(-3) M. The adsorption of this compound on carbon steel surface obeys Langmuir's adsorption isotherm. The kinetic and thermodynamic parameters were determined and discussed. Quantum chemical approach, using the density functional theory (DFT), was implemented in order to get a better understanding about the relationship between the inhibition efficiency and molecular structure of CPEPB and the calculated quantum chemical parameters were discussed. (C) 2015 Elsevier B.V. All rights reserved.