Results 31 to 40 of about 66,858 (295)

Copper-azide nanoparticle: a ‘catalyst-cum-reagent’ for the designing of 5-alkynyl 1,4-disubstituted triazoles

Scientific Reports, 2020
A single pot, wet chemical route has been applied for the synthesis of polymer supported copper azide, CuN3, nanoparticles (CANP). The hybrid system was used as ‘catalyst-cum-reagent’ for the azide-alkyne cyclo-addition reaction to construct triazole ...
Debkumar Nandi, Venkata K. Perla, Sarit K. Ghosh, Charmaine Arderne, Kaushik Mallick   +4 more
doaj   +1 more source

Chemoselective Metabolomics via a Modular Reactivity-Encoding Platform. [PDF]

Adv Sci (Weinh)
Conventional LC–MS underrepresents numerous metabolites due to heterogeneous ionization efficiencies and matrix interference. Here, we introduce a modular reactivity‐encoding platform (MREP) comprising four alkyne‐tagged probes that selectively derivatize key functional groups, followed by unified click‐chemistry capture to eliminate matrix components ...
Tao X, Zhang CM, Yang RJ, Ren M, Zhong ZL, Wang KH, Hu RX, Liu JY, Zhou JY, Li HK, Wan JB.   +10 more
europepmc   +2 more sources

Reactions of Tetracyclone Molybdenum Complexes with Electrophilic Alkynes: Cyclopentadienone–Alkyne Coupling and Alkyne Coordination [PDF]

Organometallics, 2017
The reactions of the complexes [Mo(CO)2(η4-C4Ph4CO)2] and [Mo(CO)3(NCMe)(η4-C4Ph4CO)] with the alkynes dimethyl acetylenedicarboxylate (DMAD; RC≡CR where R = CO2Me) and methyl propiolate (RC≡CH) have been studied. In the case of DMAD, the initial product is the green carbonyl complex [Mo(CO)(RC≡CR)(η5,σ-C4Ph4COCR═CR)] (3), in which two alkyne molecules
Adams, H., Booth, Y.K., Cook, E.S., Riley, S., Morris, M.J.   +4 more
openaire   +2 more sources

Facile and green synthesis of 3,5-disubstituted isoxazoles using doped nano-sized copper(I) oxide (Cu2O) on melamine–formaldehyde resin as an efficient nano-catalyst under ultrasonic irradiation [PDF]

شیمی کاربردی روز, 2019
In the present research, doped nano-sized copper(I) oxide (Cu2O) on melamine–formaldehyde resin as a heterogeneous and efficient nano-catalyst has been employed for green and mild synthesis of 3,5-disubstituted isoxazoles under ultrasonic irradiation. In
Somayeh Behrouz
doaj   +1 more source

Synthesis of Conjugated Triynes via Alkyne Metathesis [PDF]

, 2019
The synthesis of conjugated triynes by molybdenum-catalyzed alkyne metathesis is reported. Strategic to the success of this approach is the utilization of sterically-hindered diynes that allowed for the site- selective alkyne ...
Idriss, Curbet, Yann, Trolez, Thierry, Roisnel, Sophie, Colombel-Rouen, Romane, Manguin, Daniel S., Müller, Anthony, Clermont, Marc, MAUDUIT, Alexandre, Quelhas, Olivier, BASLE   +9 more
core   +2 more sources

(7R)-6-Methyl-7,9-bis(prop-2-yn-1-yl)-7H,8H,9H-1,2,4-triazolo[4,3-b][1,2,4]triazepin-8-one

IUCrData, 2016
In the title molecule, C12H11N5O, the seven-membered ring derived from triazepine adopts a boat conformation. Intermolecular C—H...N hydrogen bonds and C—H...π-ring interactions form columns of molecules parallel to the a axis, which are further ...
Youness El Bakri, Abdallah Harmaoui, Jihad Sebhaoui, Youssef Ramli, El Mokhtar Essassi, Joel T. Mague   +5 more
doaj   +1 more source

Internal alkyne regio- and chemoselectivity using a zwitterionic [(NHC)Au(I)] catalyst in a silver-free alkyne hydration reaction [PDF]

, 2016
An alkyne hydration of terminal and internal alkynes is reported using a zwitterionic NHC Au catalyst, (BNHC)Au(SMe2) (1), in the absence of silver and Brønsted acid additives.
Chen, Danmin, Dobereiner, Graham, Weerasiri, Kushan C., 0000-0003-3133-8277, 0000-0001-6885-2021, 0000-0002-7737-4583, Wozniak, Derek   +6 more
core   +1 more source

Facile Photochemical/Thermal Assisted Hydration of Alkynes Catalysed under Aqueous Media by a Chalcogen Stabilized, Robust, Economical, and Reusable Fe₃Se₂(CO)₉ Cluster

Organics, 2023
In this report, the catalytic potential of chalcogen-stabilized iron carbonyl clusters [Fe3E2(CO)9 (E = S, Se, Te)] for the photolytic hydration of alkynes has been explored.
Munsaf Ali, Avinash K. Srivastava, Nitinkumar Satyadev Upadhyay, Naveen Satrawala, Raj K. Joshi   +4 more
doaj   +1 more source

Alkyne-Functionalized Ruthenium Nanoparticles: Impact of Metal–Ligand Interfacial Bonding Interactions on the Selective Hydrogenation of Styrene

, 2018
In the present study, ruthenium nanoparticles functionalized with terminal and internal alkynes were prepared, and it was found that internal alkynes formed a η2 side-on configuration on the surface of ruthenium nanoparticles, in sharp contrast to the ...
Fengqi Zhang, Shaowei Chen, Wenming Sun (1270668), Zhang Lin, Xiongwu Kang (1525783), Lin Huang (288599), Zhenqing Shi (1275468), Jingjing Fang, Xiongwu Kang, Jingjing Fang (124938), Zhang Lin (1458301), Wenming Sun, Shaowei Chen (1391854), Lin Huang, Zhenqing Shi, Fengqi Zhang (1445968)   +15 more
core   +1 more source

Kinetic resolution of alkyne-substituted quaternary oxindoles via copper catalysed azide-alkyne cycloadditions [PDF]

, 2015
Kinetic resolution of alkyne-substituted quaternary oxindoles via copper catalysed azide-alkyne ...
William D.G. Brittain (7163375), John S. Fossey (1392100), Benjamin Buckley (1249668)   +2 more
core   +5 more sources