Nano‐TiO₂ as an Efficient Catalyst for Tandem Knoevenagel–Michael‐Cyclocondensation Reaction of Dimedone with Aromatic Aldehydes and Ammonium Acetate or Aromatic Amines under Solvent‐free Conditions

Abstract

TiO 2 nanoparticles in anatase and rutile forms was characterized and studied by several techniques including X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and successfully applied as an efficient and heterogeneous catalyst in the synthesis of 1,8-dioxo-decahydroacridines via the one-pot multi-component condensation reaction of dimedone with aromatic aldehydes and ammonium acetate or aromatic amines under mild and solvent-free conditions.

Synthesis of pyranopyrazoles using nano‐Fe‐[phenylsalicylaldiminemethylpyranopyrazole]Cl2 as a new Schiff base complex and catalyst

“…A tandem reaction is a chemical process in which at least two consecutive reactions are carried out continuously without isolation of any intermediates, changing reaction conditions and adding reagents. Clean reaction conditions, high atom economy and low generated waste are some of the advantages of such a reaction …”

Preparation And Characterization Of g-C3N4 @ L-Arginine As A Highly - Efficient And Recyclable Catalyst For The Synthesis of 1, 4-Dihydropyridine, 4H-Chromene, And 2, 3-Dihydro Quinazoline Derivatives

“…The product of the initial reaction is dihydropyridine that can later be converted to pyridine. These compounds are an important class of antihypertensive drugs, vasodilators, Hypnotic, anti-tumor 13,14 , anti-in ammatory 15,16 , anti-diabetic, antianxiety, anti-mutation, and they are known as calcium channel blockers 17 .…”

Design and identification of nano‐Mg‐[4‐methoxy phenyl‐salicylaldimine–methyl‐pyranopyrzole] Cl2 and its catalytic application on the preparation of 1‐(α‐aminoalkyl)‐2‐naphthols

“…One‐pot multi‐component reactions are important in organic chemistry because of the ability of them to prepare the related products from the reaction between three or more starting materials in one step without the creation of side products and atomic waste. Short reaction time, high efficiency, simplicity, easy work up and the lack of the need to isolate the generated intermediates during the reaction are significant advantages of these reactions …”