Results 31 to 40 of about 39,305 (203)

Magnetic ethyl-based mesoporous organosilica composite supported IL/Mn: A novel and highly recoverable nanocatalyst for preparation of 4H-pyrans

Applied Surface Science Advances, 2020
A novel magnetic bifunctional ethyl-based periodic mesoporous organosilica supported ionic liquid/manganese complex (Mag-BPMO/Mn) with core–shell structure was synthesized and characterized.
Meysam Norouzi, Dawood Elhamifar, Somayeh Abaeezadeh   +2 more
doaj   +1 more source

Synthesis of New 2-Substituted 4-(2-Furyl)-4H-pyrans

, 1994
Substituted 2-amino-3-cyano-4H-pyrans represent important precursors in syntheses of condensed heterocycles containing a 4H-pyran nucleus. In the context of studies of reactivity of 2-amino-5-acetyl-4-(5-X-2-furyl)-3-cyano-6-methyl-4H-pyrans we were ...
Dušan Ilavský, Milan Bruncko, Štefan Marchalín, Lubomír Zalibera   +3 more
core   +1 more source

Green chemistry preparation of MgO grit like nanostructures: efficient catalyst for the synthesis of 4H-pyrans and α,α′-bis(substituted-benzylidene) cycloalkanone derivatives

Green Processing and Synthesis, 2016
A grit like nanostructure of MgO was prepared in a medium of mulberry leaves extract and characterized on the basis of field emission scanning electronic microscopy (FE-SEM), X-ray diffraction (XRD), and energy dispersive X-ray (EDX) analysis.
Mobinikhaledi Akbar, Yazdanipour Atisa, Ghashang Majid   +2 more
doaj   +1 more source

Multi component one pot synthesis and characterization of derivatives of 2-amino-7,7- dimethyl-5-oxo-4-phenyl-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile and study of anti-microbial activity

Bulletin of the Chemical Society of Ethiopia, 2018
An efficient and convenient procedure has been described for one-pot multi-component synthesis of tetrahydrobenzo[b]pyrans known as 2-amino-7,7-dimethyl-5-oxo-4-phenyl-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile which can be obtained from the reaction ...
N. K. Rao, T. N. Rao, B. Parvatamma, K. P. Devi, S. C. Setty   +4 more
doaj   +1 more source

Oxidative Difunctionalization of 2‑Amino‑4H‑pyrans in Iodobenzene Diacetate and N‑Chlorosuccinimide: Reactivity, Mechanistic Insights, and DFT Calculations

, 2016
Oxidative difunctionalization of 2-amino-4H-pyrans was accomplished with iodobenzene diacetate (IBD) and N-chlorosuccinimide (NCS) reagents in alcoholic medium.
Santhosh Reddy Mandha (2015458), Vittal Rao Bommena (2015461), Manjula Alla (2015452), Santosh Kumar Lingala (2015455), Jagadeesh Babu Nanubolu (567973), Soujanya Yarasi (2015449)   +5 more
core   +2 more sources

Magnetic Zinc hydrogen salt of phosphotungstic acid: an efficient catalyst for the one-pot synthesis of 4-H pyrans derivatives [PDF]

شیمی کاربردی روز
In this study, a magnetic catalyst of phosphutangetic acid salt (ZnHPMo12O40) was prepared by substitution of protons in H3PW12O40 with zinc metal cations as a recyclable catalyst.
Mahdieh Sajadi, Ahmad Reza Momeni, Heshmatallah Samimi   +2 more
doaj   +1 more source

Electrospun Biomass‐Derived Flexible Anodes With Hierarchical Structure via Cobalt MOF Integration for Sodium‐Ion Batteries

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Hierarchically porous, N‐doped freestanding anode enables reversible Na+ insertion/desorption and Na–Co alloying, delivering fast kinetics, structural robustness, and durable sodium‐storage performance even under bending/folding. To develop a green, sustainable, and high‐performance anode for sodium‐ion batteries (SIBs), flexible biomass‐based carbon ...
Yuqiong He, Shengping Hou, Jie Liu, Shengbo Ge, Siqun Wang, Mashallah Rezakazemi, Feng Liang, Guanben Du, Kaimeng Xu   +8 more
wiley   +1 more source

Relaxant Activity of 4H-Pyran and 1,6-Dihydropyridine Derivatives on Isolated Rat Trachea

Drugs and Drug Candidates
Derivatives of 4H-pyrans and 1,6-dihydropyridines have generated considerable attention due to their interesting biological and therapeutic values. Their pharmacological activities include vasorelaxant, anticarcinogenic, antimicrobial, and antioxidant ...
Samuel Estrada-Soto, Soledad Alemán-Pantitlán, Emmanuel Gaona-Tovar, Fernando Hernández-Borja, Yolanda Alcaraz, Rafael Villalobos-Molina, Miguel A. Vázquez   +6 more
doaj   +1 more source

The Synthesis Use of a Difluorinated Amino‐Benzo‐Cinnoline Dyes (ABCDyes) Enables Fine Tuning of Emission Through Double SNAr Late‐Stage Functionalization

European Journal of Organic Chemistry, EarlyView.
An efficient synthesis of difluorinated amino‐benzo‐cinnoline dyes (ABCDyes) is reported. Their use for the late‐stage introduction of internal dinucleophilic species through a double SNAr reaction enables straightforward access to previously unexplored ABCDye analogs displaying tunable emission ranging from green to red.
Mélina Fabe, Narjis Ouazzani, Max Coehlo, Arnaud Chevalier   +3 more
wiley   +1 more source

H5BW12O40 as a green and efficient homogeneous but recyclable catalyst in the synthesis of 4H-Pyrans via multicomponent reaction

, 2022
Keggin-type heteropolyacid, H5BW12O40 (BWA) with a higher negative charge and stronger Brønsted acidity comparing to Si and P derivatives was used as an efficient, green, and reusable catalyst in a three-component reaction involving the cyclocondensation
Vahideh Zadsirjan (6272597), Seyed Yahya Shirazi Beheshtiha (556375), Majid Mommahed Heravi (9225485), Masoud Mirzaei (1645132), Fatemeh Mashayekh Ameli (11992726), Maryam Bazargan (10588409)   +5 more
core   +1 more source