Results 121 to 130 of about 22,917 (286)

Secondary Brown Carbon Formation From Photooxidation of Furans From Biomass Burning

Geophysical Research Letters
Furans are a major class of volatile organic compounds emitted from biomass burning. Their high reactivity with atmospheric oxidants leads to the formation of secondary organic aerosol (SOA), including secondary brown carbon (BrC) that can affect global ...
T. Joo, J. E. Machesky, L. Zeng, T. Hass‐Mitchell, R. J. Weber, D. R. Gentner, N. L. Ng   +6 more
doaj   +1 more source

Cobalt-Catalyzed Oxygenation/Dearomatization of Furans

, 2018
The dearomatization of aromatic compounds using cobalt­(II) acetylacetonate with triplet oxygen and triethylsilane converts furans, benzofurans, pyrroles, and thiophenes to a variety of products, including lactones, silyl peroxides, and ...
Jonathan P. Oswald (5308859), K. A. Woerpel (1312464)   +1 more
core   +1 more source

Partially Biobased Polyurethanes With Reversibly Crosslinkable Furan Units Toward Recyclable Thermosetting Textile Fibres

Chemistry – A European Journal, EarlyView.
A molecular design strategy combines lignin‐derived aromatic units, sugar‐derived furan groups, and flexible glycol segments to create wet‐spinnable polyurethanes. Thermally reversible Diels–Alder crosslinking chemistry enables formation of crosslinked thermosetting fibers, repeated de‐crosslinking/re‐crosslinking cycles, and tunable fiber properties ...
Rafael N. L. Menezes, Fredrik Bäcklund, Tam T. Nguyen, Maria Maukonen, Zengwei Guo, Olga Gordivska, Cecilia Hansson, Baozhong Zhang   +7 more
wiley   +1 more source

Access to Uncharted (Ethoxy)difluoromethylated‐Containing Tetrahydrofurans by Hydrogenation

Chemistry – A European Journal, EarlyView.
A Pd/C‐catalyzed selective hydrogenation of (ethoxy)difluoromethylated‐containing tetrahydrofurans was achieved. Depending on the pressure of H2, a divergent process led to either cis CF2CO2Et‐containing tetrahydrofurans or valuable α,α‐difluoro‐β‐hydroxyesters, offering key fluorinated building blocks for drug discovery while keeping the CF2CO2Et ...
Thibaud Charvillat, Victor Levet, Patrick Bernardelli, Marc Daumas, Hassan Oulyadi, Muriel Sebban, Vincent Ferey, Tatiana Besset   +7 more
wiley   +1 more source

On the synthesis of furans and furan fatty acids [PDF]

This thesis describes the use of silver nitrate and iodine to promote 5-endo-dig cyclisations in the synthesis of furans. The oxidation of furylethanols will be discussed as will methods to synthesise furylacetic acids. The total synthesis of a natural product, Plakorsin B will be described along with the total synthesis of the furan fatty acids F5 and
openaire  

Redox‐Tuned Oxycarbamates Enable Divergent C─N and C─C Functionalization of Indolizines Under Photoredox Catalysis With Green Light

Chemistry – A European Journal, EarlyView.
Nonafluoromesitylsulfonyl (Nms)‐substituted oxycarbamates are introduced as redox‐lowered radical precursors for green‐light photoredox synthesis. Selective N─O bond cleavage generates amidyl radicals that directly aminate indolizines in DMF, whereas DMSO promotes 1,2‐hydrogen atom transfer (HAT) to α‐amino carbon‐centered radicals and C─C bond ...
Kevin Klaus Stefanoni, René Wilhelm
wiley   +1 more source

DETERMINACIÓN DE PRECURSORES DE DIOXINAS Y FURANOS DE LOS GASES PROCEDENTES DE UN INCINERADOR EN UN REACTOR FOTOCATALÍTICO

Revista EIA
Se presenta un método cromatográfico para la determinación de dioxinas y furanos a partir de uno de sus precursores, tanto en estándares de medición como en muestras reales de gases tomadas en una empresa incineradora de Itagüí, Colombia.
Jorge Mario Giraldo, Aquiles Ocampo
doaj  

Regioselective Preparation of Benzo[b]furans from Phenols and α-Bromoketones

, 2016
In this paper, a fully regiocontrolled synthesis of either 2- and 3-substituted benzo­[b]­furans is described. Direct reaction between phenols and α-bromoacetophenones in the presence of neutral alumina yields 2-substituted benzo­[b]­furans with complete
Fernando P. Cossío (1305330), Leire Arias (2130298), Yosu Vara (1992475)   +2 more
core   +1 more source

Carboxylate–Probase Catalyzed Favorskii Reaction

Chemistry – A European Journal, EarlyView.
Stronger together: A combination of a carboxylate catalyst and a silylating agent generates a stronger base catalyst for a metal‐free catalytic addition of alkynes to aldehydes and ketones under chemoselective, O‐silylative conditions. The reaction is proposed to proceed via quaternary ammonium (Q+) cation – acetylide anion ion pairs, with chiral ...
Anton Bannykh, Sanna M. Stenfors, Anton Nechaev, John M. Fiskari, Petri M. Pihko   +4 more
wiley   +1 more source

Microwave‐assisted catalytic pyrolysis of textile wastes: Synergistic effects and product characteristics

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract This study examines the microwave‐assisted catalytic pyrolysis (MACP) of individual and blended textiles (cotton, polyester, nylon 6) using ZnO and a ZnO/natural zeolite catalyst. In a custom‐built microwave reactor operated at 500°C, 1 kW power, and a 15‐min residence time, textile wastes were pyrolyzed.
Peyman Alizadeh, Taylor Wright, Preksha Sharma, Xiaotao Bi   +3 more
wiley   +1 more source