10.1081/SIM-100002039
The research focuses on the synthesis and characterization of a linear pentadentate ligand, N-(2-hydroxyethyl)-N′′-(2-hydroxybenzyl)-diethylenetriamine (HL), and its zinc(II) complex. The study investigates the promoted hydrolysis of 4-nitrophenyl acetate (NA) by the zinc(II) complex. The ligand and its complex were synthesized using reagents like 2-chloroethanol, diethylenetriamine, and salicylaldehyde, and characterized using IR spectra, 1H NMR spectra, and elemental analyses. The protonation constants of HL and the stability constants of its Zn(II) complexation were determined through pH potentiometric titration at 25°C and I = 0.1 mol/L KNO3. The kinetics of NA hydrolysis catalyzed by the complex were studied spectrophotometrically at 25°C and I = 0.1 mol/L KNO3 in a CH3CN solvent, with the second-order rate constants (kc) for NA hydrolysis being obtained. The experiments involved the preparation of the ligand and its complex, pH titration to determine protonation and complexation equilibria, and kinetic studies to measure the rate of NA hydrolysis catalyzed by the complex.
10.3184/030823408X360355
The research describes a novel and efficient method for the one-pot synthesis of aryl vinyl ethers using β-phenylselenoethanol as a reagent. The purpose of the study was to develop a more experimentally simple and efficient methodology for the preparation of aryl vinyl ethers, which are key intermediates in various synthetic applications and polymeric materials. The researchers achieved this through a two-step process involving the Mitsunobu reaction of β-phenylselenoethanol with phenols, followed by oxidation-elimination with 30% hydrogen peroxide. The method concluded with good yields (85–90%) and had the advantages of mild reaction conditions and convenient manipulation. Key chemicals used in the process included β-phenylselenoethanol, phenols, diphenyl diselenide, sodium hydride, HMPA, 2-chloroethanol, and various phenolic substrates with different substituents. The study also reported the recovery of diphenyl diselenide in a 60% yield through the addition of hydrazine monohydrate to the aqueous extract containing benzeneseleninic acid.
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T+:Very toxic;
