Effect of the basic property of reactants (tertiary amine catalysts, a substrate amine, and acid neutralizers) on catalytic dehydrocondensation between a carboxylic acid and an amine by using 2-chloro-4,6-dimethoxy-1,3,5-triazine (CDMT) was studied. The reaction yield was affected by the acid-base equilibrium among reactants. In dichloromethane, a representative aprotic solvent, a strongly basi...

Chiral catalysis is of great industrial interest for the production of enantiomerically pure compounds. Although many homogeneous chiral catalysts have been developed, the difficulty of the product purification and catalyst recycle is one of the obstacles of the practical applications. The design and synthesis of efficient and recyclable heterogeneous chiral catalysts remain the challenges and ...

Heck reactions were performed with 4-bromoacetophenone and n-butyl acrylate, yielding the trans-arylated acrylate ester with high selectivity. Pd–zeolite catalysts were compared with supported Pd metal catalysts. In order to obtain an active and heterogeneous catalyst, the preformed or in situ-formed catalytically active Pd0 species and the PdII intermediates must be sufficiently stabilized on ...

Via the one-pot condensation reaction of ethyl acetoacetate, aromatic aldehydes, 2,4-dinitrophenylhydrazine, and β-naphthol; new pyrazolone derivatives were synthesized in the presence of three Brønsted acid catalysts. These Brønsted acid catalysts are Silica sulfuric acid (SSA), tetra-n-butyl ammonium hydrogen sulfate (TBAHSO4) and [2,2′-Bipyridine]-1,1′-diium tricyanomethanide {[2,2′-BPyH][C(...

Metallic nanoparticles are emerging as an exciting class of heterogeneous catalysts with the potential advantages of exceptional activity, stability, recyclability, and easier separation than homogeneous catalysts. The traditional colloid nanoparticle syntheses usually involve strong surface binding ligands that could passivate the surface active sites and result in poor catalytic activity. The...

Maryam Mashhadinezhad was born in Rasht, Guilan, I. R. Iran. She received her B. Sc in chemistry in 2009 from the University of Guilan and her M.Sc. in organic chemistry in 2011 from the same University. She is studying under the supervision of Dr. Farhad Shirini for her Ph. D. Her research interests include the use of heterogeneous catalysts in organic reactions.

This review gives an overview of the applications of ceria nanoparticles as inexpensive, efficient, reusable, and environmentally sustainable heterogeneous catalysts for the synthesis of a variety of key medicinal heterocyclic compounds with the emphasis on mechanistic aspects of the reactions. Literature has been surveyed from 2005 to 2018.

The development of heterogeneous chiral catalysts for enantioselective reactions is highly desirable in order to overcome some drawbacks of homogeneous catalysts. Different from the conventional approaches by using various types of supports or biphasic systems for the recovery and reuse of homogeneous catalysts, a conceptually new strategy for heterogenization of homogeneous chiral catalysts, t...

At IMM the advantages of an alternative synthesis route for biodiesel under supercritical conditions in micro-structured reactors applying heterogeneous catalysts are currently under investigation. Target of the development work is to build a pilot plant with an annual production capacity of 40 t which covers all process engineering steps and verifies their functionality in laboratory and field...