Results 31 to 40 of about 543,485 (263)

Simple, Non-catalytic Permethylation of Catechol Derivatives in Subcritical and Supercritical Water [PDF]

, 2011
Environmentally benign, non-catalytic, simple, and complete aromatic ring methylation of catechol derivatives by using 1,3,5-trioxane as the source of methyl groups was investigated in subcritical and supercritical water and under solvent-free conditions.
489, 490, 491, 492, Kobiro, Kazuya, Komatsu, Takaya, Nishimura, Daigo, Wang, Pengyu   +7 more
core   +1 more source

Solvent free permanganate oxidations [PDF]

Tetrahedron Letters, 2001
Abstract The oxidations of organic compounds by permanganate under solvent free conditions have been studied. Thiols and primary aromatic amines undergo oxidative coupling reactions to give disulfides and diazenes, respectively, sulfides are oxidized to sulfones, primary and secondary alcohols are converted to aldehydes and ketones, 1,4-diols and ...
Ahmad Shaabani, Donald G Lee
openaire   +1 more source

Mechanochemical Approach towards Multi-Functionalized 1,2,3-Triazoles and Anti-Seizure Drug Rufinamide Analogs Using Copper Beads

Molecules, 2022
Highly regiospecific, copper-salt-free and neat conditions have been demonstrated for the 1,3-dipolar azide-alkyne cycloaddition (AAC) reactions under mechanochemical conditions.
Dhananjay Bhattacherjee, Igor S. Kovalev, Dmitry S. Kopchuk, Matiur Rahman, Sougata Santra, Grigory V. Zyryanov, Pralay Das, Rituraj Purohit, Vladimir L. Rusinov, Oleg N. Chupakhin   +9 more
doaj   +1 more source

Isohexide and sorbitol-derived, enzymatically synthesized renewable polyesters with enhanced Tg [PDF]

, 2016
Sugar-based polyesters derived from sorbitol and isohexides were obtained via solvent-free enzymatic catalysis. Pendant hydroxyl groups, coming from the sorbitol units, were present along the polyester backbone, whereas the two isohexides, namely ...
Gustini, Liliane, Koning, Cor, Lavilla, Cristina, Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon, Muñoz Guerra, Sebastián   +4 more
core   +2 more sources

Advanced green synthesis: Solvent-free and catalyst-free reaction

Green Synthesis and Catalysis
The solvent-free and catalyst-free (SFCF) reaction has garnered significant interest among chemists due to its alignment with many of the 12 principles of green chemistry.
Meng-Yao Li, Ao Gu, Jiatong Li, Yingbin Liu   +3 more
doaj   +1 more source

Carboxymethyl cellulose as a green and biodegradable catalyst for the solvent-free synthesis of benzimidazoloquinazolinone derivatives

Journal of Saudi Chemical Society, 2019
Carboxymethyl cellulose (CMC) was used as an efficient, and environmentally friendly catalyst for the solvent-free three-component synthesis of quinazolinone derivatives by condensation of 2-aminobenzimidazole, dimedone or 1,3-cyclohexanedione, and ...
Maryam Karimi, M.R. Naimi-Jamal
doaj   +1 more source

Efficient One-Pot Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones via a Three-Component Biginelli Reaction

Molecules, 2021
Multicomponent reactions are considered to be of increasing importance as time progresses due to the economic and environmental advantages such strategies entail.
Giovanna Bosica, Fiona Cachia, Riccardo De Nittis, Nicole Mariotti   +3 more
doaj   +1 more source

Solvent Free Synthesis of Chalcones and their Antibacterial Activities

E-Journal of Chemistry, 2005
The solvent free synthesis of six chalcones was carried out by grinding the piperanal and the acetophenone (unsubstituted, 4-methyl, 4-methoxy, 4-bromo, 4-nitro, 3-chloro) in the presence of solid sodium hydroxide with a mortar and pestle.
K. Rajendra K. Saini, S. Amit Choudhary, Yogesh. C. Joshi, P. Joshi   +3 more
doaj   +1 more source

Single crystals of DPPH grown from diethyl ether and carbon disulfide solutions - Crystal structures, IR, EPR and magnetization studies [PDF]

, 2010
Single crystals of the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) obtained from diethyl ether (ether) and carbon disulfide (CS2) were characterized by the X-ray diffraction, IR, EPR and SQUID magnetization techniques. The X-ray structural analysis
Allen, Boris Rakvin, Boucherle, Chirkov, Dalal, Damir Pajić, Dijana Žilić, Duffy, Duffy, Duffy, Farrugia, Itterbeek, Kahn, Kiers, Kikuchi, Krešimir Molčanov, Krešo Zadro, Krzystek, Macrae, Marijana Jurić, Mattar, Nakamoto, Pavica Planinić, Rakvin, Rakvin, Rakvin, Sheldrick, Silverstein, Singer, Spek, Swarup, Weil, Weil, Williams, Williams, Yordanov   +35 more
core   +2 more sources

Reacciones asimétricas organocatalizadas en ausencia de disolvente: una estrategia para hacer más “verde” la organocatálisis

Educación Química, 2018
Solvent-free asymmetric organocatalyzed reactions: a strategy towards a greener organocatalysis According with the principles of “green” chemistry, asymmetric organocatalysis aims to become a sustainable strategy to catalyze a wide range of chemical ...
José G. Hernández, Eusebio Juaristi
doaj   +1 more source