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Upstream product

• 83-72-7 2-hydroxynaphtho-1,4-quinone 
• 89-98-5 2-chloro-benzaldehyde 
• 106-49-0 p-toluidine 

Relevant academic research and scientific papers

Effective preparation of 2-amino-3-cyano-4-aryl-5,10-dioxo-5,10-dihydro-4H- benzo[g]chromene and hydroxyl naphthalene-1,4-dione derivatives under ambient and solvent-free conditions

The mild basic ionic liquids, 1,8-diazabicyclo[5.4.0]-undec-7-en-8-ium acetate, pyrrolidinium acetate, pyrrolidinium formate, piperidinium acetate, piperidinium formate, N-methylimidazolium formate, and 3-hydroxypropanaminium acetate catalyzed three-component synthesis of 2-amino-3-cyano-4-aryl-5,10- dioxo-5,10-dihydro-4H-benzo[g]chromene and hydroxyl naphthalene-1,4-dione derivatives under ambient and solvent-free conditions. Simple procedure, high yields, short reaction time and environmentally benign method are advantages of these protocols. The inexpensive and non-toxic ionic liquids can be reused several times without noticeable loss of their activities. The mentioned ionic liquids show priority relative to other catalysts in the literature.

Design and characterization of Dendrimer of MNPs as a novel, heterogeneous and reusable nanomagnetic organometallic catalyst for one-pot synthesis of hydroxyl naphthalene-1,4-dione derivatives under solvent-free conditions

A novel super acidic magnetic nanoparticle as catalyst was successfully synthesized. The preparation of this dendrimer sulfonic acid functionalized γ-Fe2O3 magnetic core-shell silica nanoparticles as a new recoverable and heterogeneous nanocatalyst was described. The new catalyst was characterized using various techniques such as scanning electron microscopy (SEM), energy dispersive spectrum (EDS), and thermo gravimetric synthesis (TGA). Moreover, we have examined the catalytic activity of the catalyst for one-pot, efficient and facile synthesis of 2-hydroxy-1,4-naphthoquinone derivatives via a three-component condensation reaction of 2-hydroxynaphthalene-1,4-dione, aromatic aldehydes and aniline derivatives. High yields of products, short reaction times, waste-free, mild, ambient and solvent-free reaction conditions are advantages of this protocol. Also, the catalyst can be easily recovered by an external magnetic and reused several times without significant loss of its catalytic activity.

Synthesis of 2-hydroxy-1,4-naphthoquinone derivatives via a three-component reaction catalyzed by nanoporous MCM-41

A one-pot procedure for synthesis of hydroxyl naphthalene-1,4-dione derivatives via a three-component reaction of 2-hydroxynaphthalene-1,4-dione, aromatic aldehydes and heterocyclic or carbocyclic amines is developed. MCM-41 nanoporous catalyst is effective, easy recovery, reusable and makes work-up easy. This approach is clean and environmentally friendly. The structures of the new compounds were confirmed by FT-IR, 1H NMR, 13C NMR, and elemental analysis.

ZrOCl2·8H2O as an efficient catalyst for the synthesis of dibenzo [b,i]xanthene-tetraones and fluorescent hydroxyl naphthalene-1,4-diones

Abstract An efficient and environmentally benign protocol for the synthesis of dibenzo [b,i]xanthene-tetraones and fluorescent hydroxyl naphthalene-1,4-diones in the presence of a catalytic amount of ZrOCl2·8H2O as an inexpensive and eco-friendly catalyst with high catalytic activity under solvent-free conditions is reported. Graphical abstract: [Figure not available: see fulltext.]

Silica-bonded propylpiperazine-N-sulfamic acid as recyclable solid acid catalyst for preparation of 2-amino-3-cyano-4-aryl-5,10-dioxo- 5,10-dihydro-4H-benzo[g]chromenes and hydroxy-substituted naphthalene-1,4-dione derivatives

An efficient method for the synthesis of 2-amino-3-cyano-4-aryl-5,10-dioxo- 5,10-dihydro-4H-benzo[g]chromenes and hydroxy-substituted naphthalene-1,4-dione derivatives, using silica-bonded propylpiperazine-N-sulfamic acid as a solid acid, green, heterogeneous catalyst, under ambient and solvent-free conditions, is described. A simple procedure, high yields, short reaction time, safety, and reusability of the catalyst are advantages of these protocols.

Synthesis of fluorescent hydroxyl naphthalene-1,4-dione derivatives by a three-component reaction in water

An efficient one-pot synthesis of fluorescent hydroxyl naphthalene-1,4- dione derivatives by a simple, atom-economical and three-component reaction of 2- hydroxynaphthalene-1,4-dione, aromatic aldehydes and heterocyclic or carbocyclic amines in the presence of a catalytic amount of InCl3 in refluxing water is reported. The structures of the compounds were confirmed by IR, 1H NMR, 13C NMR, and elemental analysis. UV- visible absorption coefficient, maximum wavelength and fluorescence emission wavelength were measured in methanol. The products were fluorescent in solution emitting at green light (546-560 nm). The advantages of this procedure are mild reaction conditions, high yields of products, operational simplicity and easy work-up procedures. The workup of these very clean reactions involves only a filtration and simple washing step with EtOH.