Results 21 to 30 of about 68,808 (283)

Crystal structure and Hirshfeld surface analysis of 1-benzyl-3-(prop-2-yn-1-yl)-2,3-dihydro-1H-1,3-benzodiazol-2-one

Acta Crystallographica Section E: Crystallographic Communications, 2018
The title compound, C17H14N2O, is built up from the planar benzodiazole unit linked to the benzyl and propynyl substituents. The substituents are rotated significantly out of the benzodiazole plane, where the benzyl group is inclined by 68.91 (7)° to the
Asmaa Saber, Nada Kheira Sebbar, Tuncer Hökelek, Mohamed El hafi, Joel T. Mague, El Mokhtar Essassi   +5 more
doaj   +1 more source

Palladium-catalyzed cross coupling reactions of 4-bromo-6H-1,2-oxazines

Beilstein Journal of Organic Chemistry, 2009
A number of 4-aryl- and 4-alkynyl-substituted 6H-1,2-oxazines 8 and 9 have been prepared in good yields via cross coupling reactions of halogenated precursors 2, which in turn are easily accessible by bromination of 6H-1,2-oxazines 1. Lewis-acid promoted
Reinhold Zimmer, Elmar Schmidt, Michal Andrä, Marcel-Antoine Duhs, Igor Linder, Hans-Ulrich Reissig   +5 more
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Recent developments in gold-catalyzed cycloaddition reactions

Beilstein Journal of Organic Chemistry, 2011
In the last years there have been extraordinary advances in the development of gold-catalyzed cycloaddition processes. In this review we will summarize some of the most remarkable examples, and present the mechanistic rational underlying the ...
Fernando López, José L. Mascareñas
doaj   +1 more source

Chemical Architecture and Applications of Nucleic Acid Derivatives Containing 1,2,3-Triazole Functionalities Synthesized via Click Chemistry

Molecules, 2012
There is considerable attention directed at chemically modifying nucleic acids with robust functional groups in order to alter their properties. Since the breakthrough of copper-assisted azide-alkyne cycloadditions (CuAAC), there have been several ...
Wei Gong, Tim Efthymiou, Jean-Paul Desaulniers   +2 more
doaj   +1 more source

Chemoselective Biohydrogenation of Alkenes in the Presence of Alkynes for the Homologation of 2‐Alkynals/3‐Alkyn‐2‐ones into 4‐Alkynals/Alkynols [PDF]

Advanced Synthesis & Catalysis, 2019
AbstractThe chemoselective hydrogenation of alkenes in the presence of alkynes is a very challenging transformation to achieve with traditional chemical methods. The development of an effective procedure to perform this transformation would enrich the tool‐kit available to organic chemists for the development of useful synthetic routes, and the ...
Colombo D., Brenna E., Gatti F. G., Ghezzi M. C., Monti D., Parmeggiani F., Tentori F.   +6 more
openaire   +3 more sources

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
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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
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A Simple Nickel Catalyst Enables Broad E-Selective Alkyne Semihydrogenation [PDF]

, 2019
A simple and commercially available nickel catalyst for E-selective alkyne semihydrogenation is presented. The protocol is practical and encompasses a wide variety of internal alkynes, with aryl and alkyl substituents tolerated ...
Niklas O., Thiel, Benyapa Kaewmee (7299685), Trung, Tran Ngoc, Trung Tran Ngoc (7299686), Johannes F., Teichert, Benyapa, Kaewmee, Niklas O. Thiel (6235252), Johannes F. Teichert (6081896)   +7 more
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(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