Results 21 to 30 of about 39,305 (203)

Sustainable alternative protocols for the multicomponent synthesis of spiro-4H-pyrans catalyzed by 4-dimethylaminopyridine

, 2022
Green approaches to the synthesis of spiro-4. H-pyrans are reported based on the one-pot and three-component condensation via a domino Knoevenagel /Michael /cyclization sequence.
Mohamed MahmoudNasef (12004555), Masoumeh Zakeri (1551499), Arezoo Moharami (12004558), Majid Mommahed Heravi (9225485), Ebrahim Abouzari-Lotf (3125853)   +4 more
core   +1 more source

Computational Study on the Acid Catalyzed Reactions of Fluorine-Containing 2,4-Dialkoxy-3,4-dihydro-2H-pyrans with Aromatic Compounds

Applied Sciences, 2012
The reaction of 2,4-diethoxy-6-trifluoromethyl-3,4-dihydro-2H-pyran (1) with aromatic compounds in refluxing acetonitrile in the presence of p-toluenesulfonic acid gave the mixture of 4-aryl-2-trifluoromethyl-4H-pyrans (3) and 6-aryl-1,1,1-trifluorohexa ...
Norio Ota, Yasuhiro Kamitori, Ryusuke Shirai, Mizuki Hatakenaka, Etsuji Okada   +4 more
doaj   +1 more source

Synthesis of Some Aldoxime Derivatives of 4H-Pyran-4-ones [PDF]

Molecules, 2002
Aldoxime derivatives of 4H-pyran-4-ones 4-7a,b have been synthesized by the reaction of di(aminoxymethyl) pyranones 3a,b with aromatic aldehydes.
Fateme Abrishami, Reza Teimuri-Mofrad, Yadollah Bayat, Aziz Shahrisa   +3 more
openaire   +2 more sources

4H kumppanina harrastamisen Suomen mallissa [PDF]

, 2021
Opinnäytetyössä selvitettiin 4H:n kumppanuutta harrastamisen Suomen mallissa. Harrastamisen Suomen malli on yksi Valtion nuorisopoliittisen ohjelman toimenpiteistä, jolla tuetaan lasten ja nuorten harrastustoimintaa.
Hietala, Heli
core  

Chiral Cyclopentadienyl Ruthenium Complexes as Versatile Catalysts for Enantioselective Transformations

CHIMIA, 2017
Ruthenium complexes, in particular cyclopentadienyl ruthenium (??) derivatives, catalyze a vast number of transformations in the field of homogenous catalysis.
David Kossler, Nicolai Cramer
doaj   +1 more source

Grindstone Chemistry: An Efficient and Green Synthesis of 2-Amino-4H-benzo[b]pyrans [PDF]

, 2017
A single step, mild, environmentally friendly green method has been developed for the synthesis of physiologically active 2-amino-4H-benzo[b]pyrans employing solid sodium ethoxide as catalyst under solvent free conditions at room temperature via grinding.
Thangamani, Arumugam, Arumugam Thangamani   +1 more
core   +1 more source

Mesoporous KIT-6 Supported Ionic Liquids as New and Highly Effective Heterogeneous Catalysts for Three-component Synthesis of 2-Amino-3-cyano-4H-pyrans

, 2021
A series of mesoporous KIT-6 supported ionic liquids were prepared and tested as effective and practical catalysts for the synthesis of 2-amino-3-cyano-4H-pyrans.
Li, Jing Rui, Chen, Chen, Hu, Yu Lin
core   +1 more source

Synthesis and Antimicrobial Evaluation of 4H-Pyrans and Schiff Bases Fused 4H-Pyran Derivatives as Inhibitors of Mycobacterium bovis (BCG).

Iranian journal of pharmaceutical research : IJPR, 2018
The focus of our study is the synthesis and biological activity evaluation of a series of 4H-Pyran compounds and schiff bases fused 4H-Pyran derivatives which are known to possess a wide variety of biological activities. In this paper at first a simple and efficient one-pot synthesis of 4H-Pyran s from the three-component reaction between malononitrile,
Mahdavi, Seyedeh Mahbobeh, Habibi, Azizollah, Dolati, Hadi, Shahcheragh, Seyyed Mohammad, Sardari, Soroush, Azerang, Parisa   +5 more
openaire   +2 more sources

[DMImd-DMP]: A highly efficient and reusable catalyst for the synthesis of 4H-benzo[b]pyran derivatives

Heterocyclic Communications, 2019
A series of substituted 4H-pyrans derivatives were synthesized by a one-pot, multi-component reaction of aromatic aldehydes, malononitrile, and pyrazolone derivatives or active methylene carbonyl compounds such as dimedone, in the presence of 1,3 ...
Redouane Mohamed Abdenour, Khiri-Meribout Naima, Benzerka Saida, Debache Abdelmadjid   +3 more
doaj   +1 more source

Preparation and Characterization of a Molybdenum(VI) Schiff Base Complex as Magnetic Nanocatalyst for Synthesis of 2-Amino-4H-benzo[h]chromenes [PDF]

Journal of Nanostructures, 2016
A new recoverable molybdenum nanocatalyst was prepared by immobilization  of a Schiff base ligand on the surface of silica coated magnetite nanoparticles (Fe3O4@SiO2) through condensation reaction between 3-aminopropyl triethoxysilane and 2-hydroxy1 ...
Naghmeh Divsalar, Niaz Monadi, Mahmood Tajbaksh   +2 more
doaj   +1 more source