Browsing by Author "Dokari, H."
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Item Environmentally desirable synthesis: one-pot and solvent free formation of arylidenes compounds from gem-diacetates(Université M'Hamed Bougara Boumerdes, 2015) Benferrah, N.; Hammadi, M.; Dokari, H.; Berthiol, F.Heterogeneous acid catalysts are of importance in the fine chemicals area, and several been investigated in reactions such as the Knoevenagel reaction, an important reaction with pronounced solvent dependency. The condensation of active methylene compounds with gem-diacetates in the presence of acid aluminosilicates (montmorillonite KSF, K10/ZnCl2) without solvent and under microwave irradiation, an efficient of synthesis of arylidenes compounds without isolation of aldehydes compounds. Cleavage of arylidene rhodanine derivative in position 5 in basic medium on Potassium Fluoride–Barium Oxide (BaO-KF) under focused microwave irradiation and free solvent is a simple and effective method for synthesis of, β-aryl-α-thiolacrylic acidsItem Formation of Benzylidenes-Diacetates catalyzed by activated zeolite "LZY-562" and clay (K10/ZnCl2) : an unexpected functional selectivity(2015) Dokari, H.; Hammadi, M.; Benferrah, N.; Rachedi, Y.Item Synthesis of 1, 3-oxathiolanes without use of organic solvent at room temperature. Remarkable functional selectivity(2016) Dokari, H.; Hammadi, M.; Benferrah, N.; Villemin, D.The aluminosilicates acids are efficient catalysts for the synthesis of oxathiolanes without solvent at room temperature. A functional selectivity was observed between aldehydes and ketones, aldehydes were transformed quantitatively. A functional selectivity has not been described before, it was observed within differents aldehydes or within differents ketones. This selectivity is important for the control of the reactions (activation or protection) of carbonyl compounds in organic synthesisItem Tungstosilicic acid (H4SiW12O40) Have Efficient Catalysts for Synthesis of 2,3-Dihydroxynaphthoquinone from Lawsone(Université M'Hamed Bougara Boumerdes, 2017) Benferrah, N.; Hammadi, M.; Dokari, H.; Berthiol, F.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