Results 1 to 10 of about 100,522 (238)

Electrochemical cyclization of alkynes to construct five-membered nitrogen-heterocyclic rings [PDF]

Beilstein Journal of Organic Chemistry
Organic five-membered rings have shown significant applications in the fields of organic synthesis, natural products, organic materials and pharmaceuticals for their unique characteristics. Electrochemical construction of five-membered rings from alkynes
Lifen Peng, Ting Wang, Zhiwen Yuan, Bin Li, Zilong Tang, Xirong Liu, Hui Li, Guofang Jiang, Chunling Zeng, Henry N. C. Wong, Xiao-Shui Peng   +10 more
doaj   +2 more sources

Functional group tolerant iron-catalyzed cyclotrimerization of terminal and internal alkynes [PDF]

Communications Chemistry
Arenes play a crucial role in various fields of chemistry. Since Kekulé proposed the molecular structure of benzene in 1865, chemists have been working to develop methods for preparing functionalized arenes.
Benedict Klinnert, Bernd Plietker
doaj   +2 more sources

Copper-catalyzed dehydrogenative borylation of terminal alkynes with pinacolborane. [PDF]

, 2016
LCuOTf complexes [L = cyclic (alkyl)(amino)carbenes (CAACs) or N-heterocyclic carbenes (NHCs)] selectively promote the dehydrogenative borylation of C(sp)-H bonds at room temperature.
Bertrand, Guy, Jazzar, Rodolphe, Romero, Erik A   +2 more
core   +3 more sources

Base-Promoted One-Pot Synthesis of Pyridine Derivatives via Aromatic Alkyne Annulation Using Benzamides as Nitrogen Source

Molecules, 2021
In the presence of Cs2CO3, the first simple, efficient, and one-pot procedure for the synthesis of 3,5-diaryl pyridines via a variety of aromatic terminal alkynes with benzamides as the nitrogen source in sulfolane is described. The formation of pyridine
Hina Mehmood, Muhammad Asif Iqbal, Muhammad Naeem Ashiq, Ruimao Hua   +3 more
doaj   +1 more source

Mechanism, reactivity, and selectivity of nickel-catalyzed [4 + 4 + 2] cycloadditions of dienes and alkynes. [PDF]

, 2014
Density functional theory (DFT) calculations with B3LYP and M06 functionals elucidated the reactivities of alkynes and Z/E selectivity of cyclodecatriene products in the Ni-catalyzed [4 + 4 + 2] cycloadditions of dienes and alkynes.
Baran, Phil S, Götz, Daniel CG, Holte, Dane, Hong, Xin, Houk, KN   +4 more
core   +5 more sources

One-Pot Iridium Catalyzed C–H Borylation/Sonogashira Cross-Coupling: Access to Borylated Aryl Alkynes

Molecules, 2020
Borylated aryl alkynes have been synthesized via one-pot iridium catalyzed C–H borylation (CHB)/Sonogashira cross-coupling of aryl bromides. Direct borylation of aryl alkynes encountered problems related to the reactivity of the alkyne under CHB ...
Ghayoor A. Chotana, Jose R. Montero Bastidas, Susanne L. Miller, Milton R. Smith, Robert E. Maleczka   +4 more
doaj   +1 more source

Ti(O-iPr)₄-EtMgBr-Catalyzed Reaction of Dialkyl-Substituted Alkynes with Et₂Zn

Chemistry Proceedings, 2021
For the first time, the Ti(O-iPr)4-EtMgBr carbozincation of dialkyl-substituted alkynes with Et2Zn was carried out. It was found that the reaction of 1,2-disubstituted alkynes (5-decyne, 4-octyne, 3-hexyne) with Et2Zn is accompanied by the regioselective
Azat M. Gabdullin, Oleg S. Mozgovoj, Rita N. Kadikova, Ilfir R. Ramazanov, Usein M. Dzhemilev   +4 more
doaj   +1 more source

Generation of Sulfonylated Tetrazoles through an Iron-Catalyzed Multicomponent Reaction Involving Sulfur Dioxide

iScience, 2020
Summary: As a privileged motif, tetrazoles can be widely found in pharmaceuticals and materials science. Herein, a five-component reaction of cycloketone oxime esters, alkynes, DABCO·(SO2)2, and two molecules of trimethylsilyl azide under iron catalysis ...
Jun Zhang, Xuefeng Wang, Yunyan Kuang, Jie Wu   +3 more
doaj   +1 more source

Isoprene oxidation by the gram-negative model bacterium variovorax sp. WS11 [PDF]

, 2020
Plant-produced isoprene (2-methyl-1,3-butadiene) represents a significant portion of global volatile organic compound production, equaled only by methane.
Crombie, Andrew T., Dawson, Robin A., Larke-Mejía, Nasmille L., Murrell, J. Colin, Ul Haque, Muhammad Farhan   +4 more
core   +1 more source

The intermolecular hydro-oxycarbonylation of internal alkynes: current state of the art [PDF]

, 2018
The authors acknowledge the Spanish MINECO (projects CTQ2013-40591-P and CTQ2016-75986-P) and the Gobierno del Principado de Asturias (project GRUPIN14-006) for financial support. J. F.
Cadierno Menéndez, Victorio, Francos Arias, Javier, García Garrido, Sergio Emilio, González Liste, Pedro José   +3 more
core   +2 more sources