Results 21 to 30 of about 128,089 (280)

Catalytic Enantioselective Approaches to the oxa-Pictet–Spengler Cyclization and Other 3,6-Dihydropyran-Forming Reactions

SynOpen, 2019
This Short Review provides an analysis of the state-of-the-art in catalytic enantioselective oxa-Pictet–Spengler cyclizations. Also discussed are other catalytic reactions providing access to enantio­enriched isochromans and tetrahydropyrano[3,4-b ...
Zhengbo Zhu, Alafate Adili, Chenfei Zhao, Daniel Seidel   +3 more
doaj   +1 more source

Synthesis of (E)-2-(1H-tetrazole-5-yl)-3-phenylacrylenenitrile derivatives catalyzed by new ZnO nanoparticles embedded in a thermally stable magnetic periodic mesoporous organosilica under green conditions

Scientific Reports, 2022
ZnO nanoparticles embedded in a magnetic isocyanurate-based periodic mesoporous organosilica (Fe3O4@PMO–ICS–ZnO) were prepared through a modified environmentally-benign procedure for the first time and properly characterized by appropriate spectroscopic ...
Sajedeh Safapoor, Mohammad G. Dekamin, Arezoo Akbari, M. Reza Naimi-Jamal   +3 more
doaj   +1 more source

N-heterocyclic germylenes: structural characterisation of some heavy analogues of the ubiquitous N-heterocyclic carbenes [PDF]

, 2019
The X-ray crystal structures of three N-heterocyclic germylenes (NHGes) have been elucidated including the previously unknown 1,3-bis(2,6-dimethylphenyl)diazagermol-2-ylidene (1).
Dodds, Christopher A., Kennedy, Alan R., Spicer, Mark D.   +2 more
core   +2 more sources

Magnetic core–shell Carrageenan moss/Fe3O4: a polysaccharide-based metallic nanoparticles for synthesis of pyrimidinone derivatives via Biginelli reaction

Chemistry Central Journal, 2018
Magnetically recoverable polysaccharide-based metallic nanoparticles Carrageenan moss/Fe3O4 (Fe3O4@CM) was tested for the synthesis of Pyrimidinone derivatives via Biginelli reaction under reflux conditions in Water. Interestingly, Fe3O4@CM prepared from
Hossein Mohammad Zaheri, Shahrzad Javanshir, Behnaz Hemmati, Zahra Dolatkhah, Maryam Fardpour   +4 more
doaj   +1 more source

The electrochemical stability of thiols on gold surfaces [PDF]

, 2019
In this paper we present a comparative analysis of the electrochemical stability of alkanethiols, aromatic and heterocyclic thiols on the Au(111) and Au(100) faces in relation to the theoretical energetic data. The peak potential and surface coverage are
Carro, Pilar, Salvarezza, Roberto Carlos
core   +1 more source

Environmentally friendly catalyst- and solvent-free synthesis of 2-anilino nicotinic acids derivatives as potential lead COX inhibitors

BMC Chemistry, 2023
In this study, an environmentally friendly, solvent- and catalyst-free synthesis of 2-anilino nicotinic acids derivatives is reported. This operationally simple and green procedure was applied to a selection of primary aromatic amines giving rise to 23 ...
Mahsa Yarhorhosseini, Shahrzad Javanshir, Ahmad Shahir Sadr, Milad Noori, Navid Dastyafteh, Maryam Esmkhani, Aida Iraji, Mohammad Mahdavi   +7 more
doaj   +1 more source

First direct evidence of N-heterocyclic carbene in BMIm acetate ionic liquid. An electrochemical and chemical study on the role of temperature [PDF]

, 2017
Cyclic voltammetry provides the first direct evidence of N-­heterocyclic carbene (NHC) presence in neat 1-‐butyl-­3-­methylimidazolium acetate ionic liquid (BMImAcO) at 120°C. The NHC existence, proved by its oxidation current in cyclic voltammetry, was
Chiarotto, I., Feroci, M., Inesi, A.
core   +1 more source

An improved solvent-free synthesis of flunixin and 2-(arylamino) nicotinic acid derivatives using boric acid as catalyst

Chemistry Central Journal, 2017
A simple solvent-free protocol for the preparation of flunixin, a potent non-narcotic, non-steroidal anti-inflammatory drugs is reported using boric acid as catalyst. Its salt, flunixin meglumine are then prepared under reflux in EtOH.
Mahsa Yarhosseini, Shahrzad Javanshir, Zahra Dolatkhah, Mohammad G. Dekamin   +3 more
doaj   +1 more source

Synthesis of New 1,3,5-Triazine-Based 2-Pyrazolines as Potential Anticancer Agents

Molecules, 2018
A new series of 1,3,5-triazine-containing 2-pyrazoline derivatives (8–11)a–g was synthesized by cyclocondensation reactions of [(4,6-bis((2-hydroxyethyl)amino)-1,3,5-triazin-2-yl)amine]chalcones 7a–g with hydrazine hydrate and ...
Leydi M. Moreno, Jairo Quiroga, Rodrigo Abonia, Jonathan Ramírez-Prada, Braulio Insuasty   +4 more
doaj   +1 more source

Sulfamic acid pyromellitic diamide-functionalized MCM-41 as a multifunctional hybrid catalyst for melting-assisted solvent-free synthesis of bioactive 3,4-dihydropyrimidin-2-(1H)-ones

Scientific Reports, 2021
This study introduces a practical approach to fabricate a novel hybrid acidic catalyst, namely sulfamic acid pyromellitic diamide-functionalized MCM-41 (MCM-41-APS-PMDA-NHSO3H).
Ehsan Valiey, Mohammad G. Dekamin, Zahra Alirezvani   +2 more
doaj   +1 more source