Clay (KSF and K10)-supported heteropoly acids: Friendly, efficient, reusable and heterogeneous catalysts for high yield synthesis of 1,5-benzodiazepine derivatives both in solution and under solvent-free conditions

2007 ◽  
Vol 331 ◽  
pp. 78-83 ◽  
Author(s):  
Razieh Fazaeli ◽  
Hamid Aliyan
Keyword(s):  
Heterogeneous Catalysts ◽  
Solvent Free ◽  
High Yield ◽  
Heteropoly Acids ◽  
Solvent Free Conditions ◽  
Benzodiazepine Derivatives

scholarly journals M-Type SrFe12O19 Ferrite: An Efficient Catalyst for the Synthesis of Amino Alcohols under Solvent-Free Conditions

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Mouhsine Laayati ◽  
Ali Hasnaoui ◽  
Nayad Abdallah ◽  
Saadia Oubaassine ◽  
Lahcen Fkhar ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Amino Alcohols ◽  
Solvent Free ◽  
Strontium Hexaferrite ◽  
Epoxide Ring ◽  
Magnetic Nanocatalyst ◽  
Sem Images ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Bet Analysis

Magnetically separable strontium hexaferrite SrFe12O19 was prepared using the chemical coprecipitation method, and the nanostructured material was characterized by X-ray diffraction, scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), and BET analysis. The SEM images showed the homogeneity of the chemical composition of SrFe12O19 and uniform distribution of size and morphology. The pore size of the nanomaterial and its specific area were determined by BET measurements. Strontium hexaferrite SrFe12O19 exhibited a strong magnetic field, which is highly suitable in the heterogeneous catalysis as it can be efficiently separated from the reaction. The magnetic nanocatalyst showed high activity and environmentally benign heterogeneous catalysts for the epoxide ring-opening with amines affording β-amino alcohols under solvent-free conditions. When unsymmetrical epoxides were treated in the presence of aromatics amines, the regioselectivity was influenced by the electronic and steric factors. Total regioselectivity was observed for the reactions performed with aliphatic amines. The magnetically SrFe12O19 nanocatalyst showed excellent recyclability with continuously good catalytic activities after four cycles.

Aluminium complex-catalysed hydroboration of alkenes and alkynes

2019 ◽  
Vol 43 (26) ◽  
pp. 10531-10536 ◽  
Author(s):  
Adimulam Harinath ◽  
Indrani Banerjee ◽  
Jayeeta Bhattacharjee ◽  
Tarun K. Panda
Keyword(s):  
Solvent Free ◽  
High Yield ◽  
Boronate Esters ◽  
Solvent Free Conditions ◽  
Terminal Alkenes

Catalytic hydroboration of terminal alkenes/alkynes with HBpin using the Al(III) catalyst, [κ2-{Ph2P(=Se)NCH2(C5H4N)}Al(CH3)2] (1), under mild and solvent-free conditions to afford corresponding alkyl/alkenyl boronate esters in high yield is reported.

scholarly journals A Facile Solvent Free Synthesis of 3-arylidenechroman-4-ones Using Grinding Technique

2012 ◽  
Vol 9 (3) ◽  
pp. 1251-1256 ◽  
Author(s):  
Suresh Kumar ◽  
Jagdish K. Makrandi
Keyword(s):  
Polyphosphoric Acid ◽  
Cold Water ◽  
Aromatic Aldehydes ◽  
Solvent Free ◽  
Environmentally Benign ◽  
High Yield ◽  
Solvent Free Conditions ◽  
Microwave Irradiations ◽  
Grinding Technique ◽  
Solvent Free Synthesis

An efficient method for the synthesis of 3-arylidenechroman-4-ones has been developed under solvent free conditions using grinding technique. Grinding of variously substituted chroman-4-ones with aromatic aldehydes in presence of anhydrous barium hydroxide at room temperature give 3-arylidenechroman-4-ones in high yield (75-92%). Products are obtained by just acidification of the reaction mixture in ice cold water. Reaction in solid state, with enhanced rate, high selectivity and manipulative simplicity are the attractive features of this environmentally benign protocol. The chroman-4-one derivatives required for the reaction have been obtained by polyphosphoric acid (PPA) catalysed cyclisation of phenoxypropanoic acids under microwave irradiations.

scholarly journals One Pot, Solvent-Free Synthesis of Substituted 3,4-Dihydropyrimidin-2(1H)-Ones/Thiones under Microwave Irradiation (CEM) Using Reusable Nickel Nanoparticles

2015 ◽  
Vol 50 ◽  
pp. 17-25 ◽  
Author(s):  
Mayur K. Vekariya ◽  
Rajesh H. Vekariya ◽  
Nirav N. Barot ◽  
Tauhid A. Shaikh ◽  
Harjinder Kaur ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Nickel Nanoparticles ◽  
Condensation Reaction ◽  
Solvent Free ◽  
High Yield ◽  
One Pot ◽  
Mass Spectral ◽  
Keto Esters ◽  
Aryl Aldehydes ◽  
Solvent Free Conditions

A library of 3,4-dihydropyrimidin-2(1H)-ones/thiones derivatives were synthesized via Biginelli condensation reaction of β-keto esters, aryl aldehydes and urea/thiourea under solvent-free conditions utilizing nickel nanoparticles under microwave irradiation (CEM Discover). The structures of the all compounds were elucidated with the aid of elemental analysis, IR, 1H-NMR and Mass spectral data. Nickel nanoparticles can be recovered and reused five times without loss of their efficiency. Short reaction time, high yield of products and simple workup procedure, solvent-free conditions and reusability of the catalyst are the superior features of this protocol.

An imidazolin-2-iminato ligand organozinc complex as a catalyst for hydroboration of organic nitriles

2019 ◽  
Vol 43 (43) ◽  
pp. 16812-16818 ◽  
Author(s):  
Suman Das ◽  
Jayeeta Bhattacharjee ◽  
Tarun K. Panda
Keyword(s):  
Solvent Free ◽  
High Yield ◽  
Solvent Free Conditions

Catalytic hydroboration of nitriles with pinacolborane (HBpin) using the imidazolin-2-iminato zinc alkyl complex [{(ImtBuN)Zn(CH2CH3)}2] (1c) under mild and solvent-free conditions to afford corresponding diboronate esters in high yield is reported.

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