212 research outputs found
Nitration of Substituted Phenols by Different Efficient Heterogeneous Systems
Get PDFNitration of substituted phenols were carried out by the mixture of sodium nitrite and wet SiO2 (50% w/w) in the presence of four different efficient heterogeneous systems: 1) oxalic acid dihydrate (I), 2) sodium hydrogen sulphate (II), 3) aluminum hydrogen sulphate (III) and 4) silica sulphuric acid (IV) in CH2Cl2 at room temperature and high yields. Optimum conditions for theses systems and the regioselectivities of the reactions are reported.KEYWORDS: Nitration, nitrophenols, sodium nitrate, oxalic acid dihydrate, sodium hydrogen sulphate, aluminum hydrogen sulphate, silica sulphuric acid, wet SiO2
LiBr‐Catalyzed Simple and Efficient Synthesis of Some Novel Substituted Quinolines via Friedlander Heteroannulation Reaction
Full text linkIonic Liquid 3-Methyl-1-sulphonic Acid Imidazolium Chloride {[Msim]Cl}: A Highly Efficient, Mild and Green Catalyst for the Synthesis of β-Acetamido Ketones
Get PDFBrønstedacidic ionic liquid 3-methyl-1-sulphonic acid imidazolium chloride {[Msim]Cl} is utilized as a highly efficient, inexpensive, mild and green catalyst for the synthesis of β-acetamido ketones by the one-pot multi-component coupling between acetophenones, arylaldehydes, acetonitrile and acetyl chloride at room temperature. Under these conditions, the title compounds are produced in high to excellent yields and in relatively short reaction times. In addition, this method is superior to reported methods, for the synthesis of β-acetamido ketones and is applicable for the synthesis of tris(β-acetamido ketone).Keyword: 3-Methyl-1-sulphonic acid imidazolium chloride {[Msim]Cl}, β-acetamido ketone, Brønsted acidic catalyst, ionic liquid, one-pot multi-component reaction, acetophenon
1,3,5-Triazine-2,4,6-triyltrisulfamic acid (TTSA): A new organic solid acid for the nitrosation of secondary amines and oxidation of urazoles in the presence of NaNO2 under mild and heterogeneous conditions
No full textA Convenient Method for Production of Thionitrites and Disulfides Under Mild and Heterogeneous Condition
No full text1,2-Dipyridiniumditribromide-ethane (DPTBE) as a New Oxidizing Agent for the Chemoselective Oxidation of Sulfides to the Sulfoxides
No full textCaCl<sub>2</sub>.2H<sub>2</sub>O assisted oxidation of alcohols with (NH<sub>4</sub>)<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub>
No full text2383-2386CaCl2.2H2O
has been found to be an efficient reagent for the acceleration of the oxidation
of alcohols to their corresponding carbonyl compounds with (NH4)2Cr2O7
in solution and under solvent free conditions
A mild and efficient method for the acetylation of alcohols
No full text201-203The acetylation of
alcohols has been carried out efficiently in the presence of a catalytic amount
of Zr(HSO4)4. All reactions are performed at room
temperature and under heterogeneous conditions in good to high yields
Melamine Hydrogen Peroxide (MHP): Novel and Efficient Reagent for the Chemo- and Homoselective and Transition Metal–Free Oxidation of Thiols and Sulfides
No full text- …
