scholarly journals An Efficient Oxidation of Benzoins to Benzils by Manganese(II) Schiff Base Complexes Using Green Oxidant

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Javad Safari ◽  
Zohre Zarnegar ◽  
Fatemeh Rahimi
Keyword(s):  
Schiff Base ◽  
Catalytic Oxidation ◽  
Room Temperature ◽  
Reaction Times ◽  
Schiff Base Complexes ◽  
High Yield ◽  
Reusable Catalyst ◽  
Simple Method ◽  
Convenient Procedure ◽  
Yield And Purity

A simple, highly efficient and mild catalytic oxidation of benzoins to the corresponding benzils was developed using manganese(II) Schiff base complexes as novel and reusable catalyst in the presence of acetonitrile as solvent and H2O2as green oxidant. This simple method affords benzil derivatives at room temperature in short reaction times with high yield and purity. This convenient procedure will allow a further increase of the diversity within the benzil family.

Green synthesis and spectroscopic studies of some complexes compounds as pigments and their applications in paints

2017 ◽  
Vol 46 (4) ◽  
pp. 286-295 ◽  
Author(s):  
Osama A.G. Wahba ◽  
Ali M. Hassan ◽  
Abdelrahman M. Naser ◽  
Adel M.G. Hanafi
Keyword(s):  
Schiff Base ◽  
Green Synthesis ◽  
Simple Technique ◽  
Spectroscopic Studies ◽  
Schiff Base Complexes ◽  
High Yield ◽  
Corrosion Properties ◽  
Content Type ◽  
Physico Chemical ◽  
The Cost

Purpose The purpose of this study to investigate the synthesis of new Cr(III), Fe(III), Ni(II) and Cu(II) Schiff base complexes by a simple technique (microwave technique). The evaluation of the prepared complexes as pigments as corrosion resistant was also explored. Design/methodology/approach The Schiff base complexes were prepared by using microwave method (green chemistry), and then, the physico-chemical requirements according to standards for the synthesised pigments were investigate. Findings The prepared complexes exhibit good physical, mechanical and corrosion properties as pigments in paint formulations. Research limitations/implications The simple technique used for synthesis of metal complex pigments will significantly increase the cost saving for the manufacturing of such pigments category. Also, the used technique is considered a green method (eco-friendly), as there no organic solvent was used. Practical implications The evaluation of the prepared complex pigments as corrosion resistants was also studied. Originality/value It is a simple technique, green synthesis (no solvent used) is involved and high yield is obtained.

A Suitable One-Pot Synthesis of 3,4-Dihydropyrano[3,2-c]Chromenes Using Magnetic Nanoparticles Tag: Piperidinium Benzene-1,3-Disulfonate Ionic Liquid as a Novel, Green, Efficient and Reusable Catalyst in Aqueous Medium

2017 ◽  
Vol 14 (6) ◽  
pp. 904-911 ◽  
Author(s):  
Ramin Ghorbani-Vaghei ◽  
Jafar Mahmoodi ◽  
Yaser Maghbooli ◽  
Azadeh Shahriari
Keyword(s):  
Ionic Liquid ◽  
Magnetic Nanoparticles ◽  
Reaction Times ◽  
Catalytic Amount ◽  
High Yield ◽  
Reusable Catalyst ◽  
One Pot ◽  
Efficient Catalyst ◽  
Water Solvent ◽  
The One

Background: The synthesis of 3,4-dihydropyrano[3,2-c]chromenes via the one-pot three-component reactions of various aldehydes, malononitrile, and 4-hydroxycumarin at 60 °C in water as a solvent by the magnetic nanoparticles tag: piperidinium benzene-1,3-disulfonate ionic liquid as a green and efficient catalyst. Some benefits of the presented technique are significant cost impact, impressive catalysis and the ability to reuse of the catalyst. The current procedure offers high yield, short reaction times, neat reaction and simple reusable catalyst. Objective: A magnetic nanoparticles tag: piperidinium benzene-1,3-disulfonate ionic liquid as a green, efficient, reusable and heterogeneous catalyst was used for the synthesis of 3,4-dihydropyrano[3,2-c]chromenes. Method: We have described an efficient and green process for the synthesis of the one-pot three-component synthesis of 3,4-dihydropyrano[3,2-c]chromenes from the reaction between 4-hydroxy-coumarin with malononitrile and aldehydes in the presence of catalytic amount of magnetic nanoparticles tag: piperidinium benzene-1,3-disulfonate ionic liquid as a novel and powerful nano ionic liquid with good to excellent yields and in a short reaction time in water solvent at 60 °C. Result: The main advantage of this process is the simplicity of the work-up and the products can be isolated without chromatography. Conclusion: We suggest that the method has also various additional advantages such as low loading of catalyst, clean reaction, which makes it a suitable and noteworthy approach for the synthesis of 3,4- dihydropyrano[3,2-c]chromenes.

Preparation and Characterization of Hollow MgO/SiO2 Nanocomposites and using as Reusable Catalyst for Synthesis of 1H-Isochromenes

2021 ◽  
Author(s):  
Somaye Mohammadi ◽  
Hossein Naeimi
Keyword(s):  
Heterogeneous Catalyst ◽  
Michael Addition ◽  
Room Temperature ◽  
Aldol Reaction ◽  
Reaction Times ◽  
Active Area ◽  
Reusable Catalyst ◽  
Simple Filtration ◽  
Sio2 Nanocomposites

Abstract In the present study, hollow MgO/SiO2 nanocatalyst with great base properties was made. This heterogeneous catalyst was a synthesis in several steps to create a great active area and decrease the density of the catalyst. The base hollow catalyst framework for the reaction of cyclohexanone, malononitrile and benzaldehyde to the synthesis of 1H-isocromene from Michael addition and aldol reaction at room temperature. All the reaction flowing was excellent in the yield of productand reaction times. At the end of the reaction, the nanocatalyst separated by simple filtration and reuse in several runs elsewhere.

Catalytic oxidation and C–C coupling reactions of new ruthenium(III) Schiff base complexes containing PPh3 or AsPh3 co-ligands

2008 ◽  
Vol 34 (1) ◽  
pp. 7-13 ◽  
Author(s):  
Nagarajan Sathya ◽  
Arumugam Manimaran ◽  
Gunasekaran Raja ◽  
Periyasamy Muthusamy ◽  
Kandasamy Deivasigamani ◽  
...  
Keyword(s):  
Schiff Base ◽  
Catalytic Oxidation ◽  
Schiff Base Complexes ◽  
Coupling Reactions

Iodosulfonation of alkenes with benzenesulfinic acid – N-iodosuccinimide — Facile preparation of α,β-unsaturated sulfones

2006 ◽  
Vol 84 (4) ◽  
pp. 667-675 ◽  
Author(s):  
Russell R Wolff ◽  
Vikram Basava ◽  
Robert M Giuliano ◽  
Walter J Boyko ◽  
J Herman Schauble
Keyword(s):  
Room Temperature ◽  
High Yield ◽  
Allylic Alcohols ◽  
Neutral Alumina ◽  
Silyl Ethers ◽  
Step Procedure ◽  
Ferrier Rearrangement ◽  
Facile Preparation ◽  
High Yields ◽  
Yield And Purity

Reaction of alkenes and alkenols with N-iodosuccinimide (NIS) and benzenesulfinic acid in dichloromethane at room temperature affords vic-iodophenylsulfonyl adducts in good to high yields. Treatment of the iodosulfones with neutral alumina in dichloromethane at room temperature results in dehydroiodination to give the corresponding vinyl sulfones in high yield and purity by this convenient two-step procedure. Application of the iodosulfonation–dehydroiodination sequence to allylic alcohols and silyl ethers gave γ-oxygenated, α,β-unsaturated phenylsulfones, while the attempted iodosulfonation of glycals, as intermediates to vinyl sulfones, resulted in addition of benzenesulfinic acid with double bond shift (Ferrier rearrangement). Key words: iodosulfonation, vinyl sulfones, benzenesulfinic acid, N-iodosuccinimide, dehydroiodination.

scholarly journals Technetium and rhenium schiff base complexes for nuclear medicine

2019 ◽  
Author(s):  
◽  
Jakob Edwin Baumeister
Keyword(s):  
Nuclear Medicine ◽  
Schiff Base ◽  
Reaction Times ◽  
Mixed Ligand ◽  
Schiff Base Complexes ◽  
Microwave Assisted Synthesis ◽  
One Pot ◽  
Diverse Range ◽  
Microwave Assisted ◽  
Potential Applications

This dissertation investigates the synthesis of rhenium and technetium Schiff base complexes for potential applications in nuclear medicine. In Chapter 2, a series of mixed ligand Re(III) complexes of the form trans-[Re(PR3)2(tmf2en)]+ were prepared by microwave assisted synthesis. A two-step (one-pot) procedure was utilized. In the first step, the Re(V) precursor (nBu4N)[ReOCl4] is reacted with the Schiff base ligand forming trans-[ReOCl(tmf2en) in situ. In the second step, a tertiary phosphine ligand is added yielding the reduced trans-[Re(PR3)2(tmf2en)][superscript +] species. The preparation of these trans-[Re(PR3)2(tmf2en)][superscript +] complexes by microwave assisted synthesis resulted in higher reaction yields and shorter reaction times compared to syntheses of similar Re(III) Schiff base complexes. The general methodology proved to be useful for the synthesis of mixed ligand Re(III) complexes with a diverse range of Schiff base ligands and phosphines.

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