Results 21 to 30 of about 16,283 (253)

Design, development and applications of copper-catalyzed regioselective (4 + 2) annulations between diaryliodonium salts and alkynes

Communications Chemistry, 2022
Intermolecular (4 + 2) cycloaddition with alkynes is a powerful approach to construct isocoumarin moieties, however, regioselectivity remains challenging for the transition metal-catalyzed approach.
Weilin Wang, Junrui Zhou, Chao Wang, Congdi Zhang, Xiao-Qian Zhang, Youliang Wang   +5 more
doaj   +1 more source

Functionalization of remote C(sp3)-H bonds enabled by copper-catalyzed coupling of O-acyloximes with terminal alkynes

Nature Communications, 2020
Sonogashira cross-coupling is a powerful strategy to prepare functionalized internal alkynes. Here, the authors report a domino sequence for the generation of γ-/δ-alkynyl nitriles and γ-alkynyl ketones from the coupling of terminal alkynes with O ...
Zhaodong Li, Rubén O. Torres-Ochoa, Qian Wang, Jieping Zhu   +3 more
doaj   +1 more source

QUANTITATIVE CORRELATION «STRUCTURE OF ALKYNES C2H2-C9H16 – THE HEAT OF VAPORIZATION » [PDF]

Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов, 2013
For series alkynes CnH2n-2 based on group additive method (which based on the first environment of atoms), one obtained 8-constant additive scheme of calculation of their physical and chemical properties.
V.V. Grebeshkov, V.M. Smolyakov
doaj  

Modulation of metal species as control point for Ni-catalyzed stereodivergent semihydrogenation of alkynes with water

Nature Communications, 2023
Generally, transition metal-catalyzed stereodivergent transfer semihydrogenation of alkynes realized regulation of stereoselectivity by a Z to E isomerization process.
Yuanqi Wu, Yuhui Ao, Zhiming Li, Chunhui Liu, Jinbo Zhao, Wenyu Gao, Xuemeng Li, Hui Wang, Yongsheng Liu, Yu Liu   +9 more
doaj   +1 more source

Internal lattice oxygen sites invert product selectivity in electrocatalytic alkyne hydrogenation over copper catalysts

Nature Communications
Copper-based catalysts exhibit excellent performance of electrocatalytic alkynes hydrogenation, especially for the selective alkynes hydrogenation toward alkenes.
Mengyu Li, Yimin Jiang, Wei Chen, Yucheng Huang, Yingrui Lu, Leitao Xu, Shengkai Li, Yandong Wu, Zhongcheng Xia, Ruiqi Wang, Shuangyin Wang, Yuqin Zou   +11 more
doaj   +1 more source

Electrochemical Behavior of Flame‐Sprayed Sc‐Doped AlCoCrFeMo High‐Entropy Alloy Coatings in 3.5% Sodium Chloride Solution

Advanced Engineering Materials, EarlyView.
Scandium (Sc)‐doped AlCoCrFeMo HEA coatings are fabricated via flame spraying with 0.1, 0.3, and 0.5 wt% Sc additions. Among these, the HEA‐Sc0.3 coating exhibits the highest corrosion resistance, indicated by a more positive corrosion potential and lower current density.
Pankaj Kumar, Akash Vyas, Mohammad Aatif Qazi, Nashit Jalal, Maria Ophelia Jarligo, Mostafa Yakout, Jing Liu, André McDonald   +7 more
wiley   +1 more source

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

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   +1 more source

Hybrid Metal–Carbon Ink for Printed Stretchable Temperature Sensors

Advanced Engineering Materials, EarlyView.
We prepare conductive inks for temperature sensing with silver flakes and carbon or graphite flakes in a silicone elastomer matrix. Silver dominates the temperature‐dependent conductivity, while the carbon filler network ensures the stability of the conductive pathways and retains function under strain.
Makara Lay, Xue Bai, Thomas Kister, Tobias Kraus   +3 more
wiley   +1 more source

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

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   +1 more source

The evolution of fundamental concepts in organic chemistry: Hydrocarbons in Iranian secondary school chemistry textbooks and their information content and importance based on shannon entropy [PDF]

پژوهش در آموزش شیمی
Background and Objective: This study examines the changes in the basic concepts of the chemistry of different branches of hydrocarbons (alkanes, alkenes, alkynes, and aromatics) in high school chemistry textbooks from 1971 to 2021.
Doost Mohammad Samiei Paghaleh, Elnaz Rashtizadeh   +1 more
doaj   +1 more source