Results 91 to 100 of about 22,917 (286)

Impacts of Solvents on the Stability of the Biomass-Derived Sugars and Furans

, 2020
During the conversion of sugars/furans into the value-added chemicals via acid catalysis, solvent in addition to acid catalyst is deemed as an essential parameter affecting the reaction network.
Tao Wei, Tao Wei (18855), Lijun Zhang, Qing Liu (20889), Xun Hu (74649), Yifan Sun, Yi Wang (32470), Kai Sun, Shu Zhang, Yi Wang, Xun Hu, Kai Sun (140584), Guanggang Gao (2423809), Qing Liu, Lijun Zhang (483325), Guanggang Gao, Yifan Sun (734245), Shu Zhang (22238)   +17 more
core   +1 more source

Gold-Catalyzed Propargylic Substitution Followed by Cycloisomerization in Ionic Liquid: Environmentally Friendly Synthesis of Polysubstituted Furans from Propargylic Alcohols and 1,3-Dicarbonyl Compounds

Molecules
Gold-catalyzed propargylic substitution of propargylic alcohols 1 with 1,3-dicarbonyl compounds 2 followed by cycloisomerization in ionic liquid enables the environmentally friendly synthesis of polysubstituted furans 3 in good-to-high yields.
Hitomi Chiaki, Yoshimitsu Hashimoto, Nobuyoshi Morita   +2 more
doaj   +1 more source

Rapid pseudo five-component synthesis of intensively blue luminescent 2,5-di(hetero)arylfurans via a Sonogashira–Glaser cyclization sequence

Beilstein Journal of Organic Chemistry, 2014
2,5-Di(hetero)arylfurans are readily accessible in a pseudo five-component reaction via a Sonogashira–Glaser coupling sequence followed by a superbase-mediated (KOH/DMSO) cyclization in a consecutive one-pot fashion. Besides the straightforward synthesis
Fabian Klukas, Alexander Grunwald, Franziska Menschel, Thomas J. J. Müller   +3 more
doaj   +1 more source

Cleanup and quantification of polychlorinated dibenzo-p-dioxins/furans and polychlorinated biphenyls

, 1998
By using modern techniques of isotope dilution, high-resolution gas chromatography/high-resolution mass spectrometry and multiple ions detection, an effective cleanup, qualitative and quantitative method was developed for polychlorinated dibenzo-p ...
Kettrup, A, Xu, Y, Lu, PC, Schramm, KW, Zhang, YY, Liang, XM, Zhang, QH, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China, Zhang, QH, Wu, WZ   +8 more
core  

Recent advances in photocatalytic hydrogen peroxide production

PhotoMat, EarlyView., 2023
We classify the representative photocatalytic materials for photosynthesis of hydrogen peroxide (H2O2) in recent years and discuss the related modification methods in detail, providing inspiration and insights for the future design of photocatalysts for H2O2 production.
Jinyu Yan, Yuan Li, Yunxiang Li, Shuxin Ouyang, Tierui Zhang   +4 more
wiley   +1 more source

Aza‐Büchner–Curtius–Schlotterbeck Reaction Enables Selective Construction of Quaternary Carbon Centers

Angewandte Chemie International Edition, EarlyView.
We introduce the Aza‐Büchner–Curtius–Schlotterbeck (ABCS) reaction: A mild, catalyst‐free method for homologating aryl imines. Diverging from the traditional BCS mechanism, the diazo intermediate undergoes selective C─C insertion to form an all‐carbon quaternary center.
Simon O. Angerer, Vincent George, Aryaman Pattanik, Gaia Carpentiero, Tereza Morcinková, Julia Rehbein, Burkhard König   +6 more
wiley   +1 more source

Photochemical reactions of biomass derived platform chemicals

Frontiers in Chemistry
Platform chemicals obtained from biomass will play an important role in chemical industry. Already existing compounds or not yet established chemicals are produced from this renewable feedstock. Using photochemical reactions as sustainable method for the
Norbert Hoffmann, Mario Andrés Gomez Fernandez, Arthur Desvals, Corentin Lefebvre, Clément Michelin, Mohammed Latrache   +5 more
doaj   +1 more source

Borane catalysed ring opening and closing cascades of furans leading to silicon functionalized synthetic intermediates

Nature Communications, 2016
Furans are attractive staring materials in organic chemistry, due to the ease of functionalisation and sourcing from renewable feedstocks. Here the authors show the ring opening of furans to silane intermediates, followed by further conversion to ...
Chinmoy K. Hazra, Narasimhulu Gandhamsetty, Sehoon Park, Sukbok Chang   +3 more
doaj   +1 more source

Photochemical reactions of 2-substituted furans with some carbonyl compounds

, 1984
Photochemical reactions of 2-substituted furans I, IV and V with benzaldehyde, benzophenone and 4-methylbenzophenone gave substitued 2,7-dioxabicyclo[3,2,0]-3-heptenes, which can be used for syntheses of 2,3- or 2,4-disubstituted furans. Regioisomeric (2:
Jana Rudá, Ladislav Štibrányi, Stanislav Sekretár   +2 more
core   +1 more source

Dioxins and Furans as Pollutant Emissions From Integrated Steel Works

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, 2011
In the metallurgical industry are several sources for pollutant emissions but the main source is the sintering process. In this paper are analyzed the generation process of persistent organic pollutant emissions (dioxins and furans) mainly from the ...
Anișoara CIOCAN
doaj