algerian journal of environmental science and technology
Volume 3, Numéro 2, Pages 63-67
2017-06-30

Tungstosilicic Acid (h4siw12o40) Have Efficient Catalysts For ‎synthesis Of 2,3-dihydroxynaphthoquinone From Lawsone

Authors : Benferrah N . Hammadi M . Dokari H . Berthiol F .

Abstract

The Thiele–Winter reaction is of interest for synthesis of ‎tetracetoxyaromatic precursors of hydroxynaphtoquinones. Solid ‎acids such as Tungstosilicic acid (H4SiW12O40) have an efficient ‎catalyst in acetoxylation reaction of naphtoquinones without the ‎use of organic solvent at room temperature. 1,2,3,4-‎Tetrahydroxynaphthalene was easily oxidized at room temperature ‎in 2,3-Dihydroxynaphthoquinone by using (Pc[Co]/K10) and air ‎‎(1 atm). We have also tested this type of reaction in 2-‎hydroxynaphthoquinone (Lawsone). Many naphthoquinones are ‎natural products with interesting biological properties. ‎

Keywords

Heteropolyacids ;‎ Without solvent ;‎ Room temperature ;‎ Lawsone ; ‎ Catalytic system ‎‎(Pc[Co]/K10) ;‎ ‎2,3-‎dihydroxynaphthoquinone‎

A New Microwave-assisted Hydrolysis, A Catalytic Acylation And An Efficient Synthesis Of Derivatives Of Flavanones With Hydroxylamine And Phenylhydrazines

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A Green And Efficient Method For The Synthesis Of Homodimeric (β-dicarbonyl) Arylmethanes And Dihydropyridine From Dimedone In Water

Bayou-khier N. .  Amari M. .  Fodili M. .  Grau S.g. .  Hoffmann P. . 
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Synthesis And Characterization Of The Hybrid Ni-tio2/pani For An Efficient Hydrogen Photoproduction Under Visible Light

Nsiba Mohamed Faouzi .  Saafia Samira .  Rayesa Ali .  Houasa Ammar . 
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Determination Of Caffeic Acid And Gallic Acid In Algerian Bee Pollen By An Hplc Method

Rebiai Abdelkerim .  Lanez Touhami .  Belfar Mohamed Lakhder . 
pages 190-197.