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

Tungstosilicic Acid (H4Siw12O40) Have Efficient Catalysts For ‎synthesis Of 2,3-Dihydroxynaphthoquinone From Lawsone

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

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