Uncatalyzed,One-pot Synthesis of 3,3'-(Benzylene)bis(4-hydroxy-2H-chromen-2-one)Derivatives under Thermal Solvent-free Conditions

A series of 3,3′‐(benzylene)bis(4‐hydroxy‐2H‐chromen‐2‐one) derivatives have been synthesized from condensation reactions of 4‐hydroxycoumarin with benzaldehydes under thermal solvent‐free conditions. This environmentally friendly synthesis is uncatalyzed and affords the desired products in excellent yields.     

2-Hydroxyethylammonium acetate: A reusable task-specific ionic liquid promoting one-pot,three-component synthesis of 2-amino-3,5-dicarbonitrile-6-thio-pyridines

2-Hydroxyethylammonium acetate (2-HEAA) as a task-specific ionic liquid, efficiently promotes one-pot three-component reaction of aryl/heteroaryl/alkyl aldehydes with aryl/alkyl thiols and malononitrile at room temperature. This protocol offers several advantages such as using a reusable and cost-effective ionic liquid, being amenable to scale-up and produces the corresponding 2-amino-3,5-dicarbonitrile-6-thio-pyridines in a short reaction time (5 min) and in good to high yields.     

A Green Approach to the Bio-based Synthesis of Selenium Nanoparticles from Mining Waste

Journal of Cluster Science - This study deals with producing selenium nanoparticles (SeNPs) by an economical and reliable process using a mining waste that contains significant amounts of selenium...     

Green synthesis of a nano salt and its application as multifunctional organocatalyst for Knoevenagel condensation

Research on Chemical Intermediates - 1,2-Ethanediammonium 3-hydroxypropane-1-sulfonate [(EDA)(HPS)] as a novel nano multifunctional organosalt was synthesized via a simple and green chemical route...     

Task-Specific Ionic Liquid as the Recyclable Catalyst for the Rapid and Green Synthesis of Dihydropyrano[3,2-c]chromene Derivatives

Abstract

A task-specific ionic liquid, [H₃N⁺–CH₂–CH₂–OH][CH₃COO^?], was successfully applied as an efficient and reusable catalyst for the one-pot domino to approach to dihydropyrano[3,2-c]chromene derivatives with atom economy in a condensation reaction of 4-hydroxycoumarin, aldehydes, and malononitrile in a combinatorial fashion. The reaction gave excellent yields within short reaction times at room temperature under solvent-free grinding conditions. The products and ionic liquid could be conveniently separated from the reaction mixture, indicating that the whole process was performed as a green chemical transformation.      

Synthesis of 2,3-Dihydroquinazoline-4(1H)-ones

An efficient, inexpensive, and heterogeneous catalyst, [Al(H₂PO₄)₃], was applied in a three-component, one-pot cyclocondensation reaction of isatoic anhydride with primary amines (or ammonium salts) and aldehydes to afford the corresponding quinazolinone derivatives in excellent yields. Reactions occurred under thermal solvent-free conditions. It was found that this solid acidic catalyst could be easily recovered and reused for at least three cycles without any loss of activity.     

Nanoammonium salt: a novel and recyclable organocatalyst for one-pot three-component synthesis of 2-amino-3-cyano-4<Emphasis Type="Italic">H</Emphasis>-pyran derivatives

1,3-Propanediaminium methanesulfonate [(PDA)(MeSO₃)] was synthesized as the first nanoaliphatic ammonium salt via a safe and simple chemical route in aqueous media. [(PDA)(MeSO₃)] ammonium salt was characterized by XRD, TEM, SEM, EDS, DLS, AFM, ¹H NMR, ¹³C NMR, FT-IR, TG, and elemental analysis. [(PDA)(MeSO₃)] ammonium salt was efficiently applied as an eco-friendly and recyclable organocatalyst for the one-pot, three-component synthesis of 2-amino-3-cyano-4H-pyran derivatives. From an economical and environmental point of view, this novel catalyst has the merits of environmental friendliness, high yields, shorter reaction time, simple work-up, easy operation, the avoidance of the organic solvents, and inexpensive catalysts.     

Magnetic Properties of an Antiferromagnetic Spin-1/2 XYZ Model in the Presence of Different Magnetic Fields: Finite-Size Effects of Inhomogeneity Property*

Magnetic and thermodynamic properties of the anisotropic XYZ spin-1/2 finite chain under both homogeneous and inhomogeneous magnetic fields are theoretically studied at low temperature. Using exact diagonalization method (ED), we study the magnetization, magnetic susceptibility, and specific heat of the model characterized in terms of the finite correlation length in the presence of three different magnetic fields including longitudinal, transverse, and transverse staggered magnetic fields. The magnetization, susceptibility, and the specific heat of the model are investigated under two conditions separately: (i) When the model is putted in the presence of homogeneous magnetic fields. (ii) When finite inhomogeneities are considered for all applied magnetic fields in the Hamiltonian. We show that for the finite-size XYZ chains at low temperature, the evident magnetization plateaus gradually convert to their counterpart quasi-plateaus when the transverse magnetic field increases. Moreover, the influence of the transverse and staggered transverse magnetic fields, and their corresponding inhomogeneities on the magnetization process, magnetic susceptibility, and specific heat are reported in detail. Our exact results illustrate that by altering the inhomogeneity parameters, magnetization plateaus gradually convert to their counterpart quasi-plateaus. The specific heat manifests Schottky-type maximum, double-peak, and triple-peak, as well as, transformation between them by varying considered inhomogeneity parameters in the Hamiltonian.