Results 1 to 10 of about 45,374 (213)

Nickel/Photoredox-catalyzed diastereoselective semihydrogenation of alkynes using a carboxylic acid as a cooperative ligand and hydrogen surrogate [PDF]

Nature Communications
The Z-selective semihydrogenation of alkynes plays a key role in the industrial manufacture of fine chemicals. Considerable research attention has focused on the development of reagents, catalysts, and protocols for stereoselective reduction of alkynes ...
Jiaqian Zhang, Na Zhang, Wenjin Sun, Mi Jie, Zhiqiang Pan, Chengfeng Xia   +5 more
doaj   +2 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

Alkynylzirconation of Alkynes and Application to One‐Pot Bisalkynylation of Alkynes. [PDF]

ChemInform, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Yuanhong, Liu, Zhenqi, Zhong, Kiyohiko, Nakajima, Tamotsu, Takahashi   +3 more
openaire   +2 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

Nickel-catalyzed deaminative Sonogashira coupling of alkylpyridinium salts enabled by NN2 pincer ligand

Nature Communications, 2021
Alkynes are amongst the most valuable functional groups in organic chemistry, however, the preparation of alkyl-substituted alkynes still remains elusive. Here the authors show a nickel-catalyzed deaminative Sonogashira coupling of alkylpyridinium salts.
Xingjie Zhang, Di Qi, Chenchen Jiao, Xiaopan Liu, Guisheng Zhang   +4 more
doaj   +1 more source

«STRUCTURE OF ALKYNES C2H2 — C9H16 HEAT OF VAPORIZATION» CORRELATION

Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов, 2014
To investigate the quantitative correlation «structure of 132 alkynes C2H2−C9H16 – property», topological indexes χ Randich and ∆i3 were used. Then using the two-parameter functions, quantitative correlation «structure of alkynes – property» are ...
V.V. Grebeshkov, V.M. Smolyakov
doaj   +1 more source

Electrochemical Hydroboration of Alkynes [PDF]

Chemistry – A European Journal, 2021
AbstractHerein we reported the electrochemical hydroboration of alkynes by using B2Pin2 as the boron source. This unprecedented reaction manifold was applied to a broad range of alkynes, giving the hydroboration products in good to excellent yields without the need of a metal catalyst or a hydride source.
Maude Aelterman, Morgane Sayes, Philippe Jubault, Thomas Poisson   +3 more
openaire   +2 more sources

Alkynes as Synthetic Equivalents of Ketones and Aldehydes: A Hidden Entry into Carbonyl Chemistry

Molecules, 2019
The high energy packed in alkyne functional group makes alkyne reactions highly thermodynamically favorable and generally irreversible. Furthermore, the presence of two orthogonal π-bonds that can be manipulated separately enables flexible synthetic ...
Igor V. Alabugin, Edgar Gonzalez-Rodriguez, Rahul Kisan Kawade, Aleksandr A. Stepanov, Sergei F. Vasilevsky   +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