Results 71 to 80 of about 89,598 (163)

Surface Behavior Regulation of Intermediates on the Copper‐Based Catalysts for Enhancing Electrocatalytic CO2 Reduction to Ethylene

Small, Volume 21, Issue 51, December 23, 2025.
This review highlights the mechanistic regulation of *CO intermediates in electrocatalytic CO2 reduction to ethylene. Strategies including surface/structural engineering, valence tuning, interface modulation, and deoxygenation pathway control are systematically mapped to *CO generation, coupling, and transformation, offering guidance for mechanism ...
Peng Luo, Ziyuan Yang, Yuxia Jin, Shasha Li, Yuanchuan Hao, Yun Duan, Wei Huang, Lei Liu, Kai Yan, Abuliti Abudula, Guoqing Guan   +10 more
wiley   +1 more source

The activity of pyrazolo[4,3-e][1,2,4]triazine and pyrazolo[4,3-e]tetrazolo[1,5-b][1,2,4]triazine sulphonamide derivatives in monolayer and spheroid breast cancer cell cultures

Journal of Enzyme Inhibition and Medicinal Chemistry
In the last decade, an increasing interest in compounds containing pyrazolo[4,3-e][1,2,4]triazine moiety is observed. Therefore, the aim of the research was to synthesise a novel sulphonyl pyrazolo[4,3-e][1,2,4]triazines (2a, 2b) and pyrazolo[4,3-e ...
Anna Szymanowska, Dominika Radomska, Robert Czarnomysy, Mariusz Mojzych, Katarzyna Kotwica-Mojzych, Krzysztof Bielawski, Anna Bielawska   +6 more
doaj   +1 more source

1,2,4-Triazine Chemistry Part II: Synthetic approaches for phosphorus containing 1,2,4-triazine derivatives

European Journal of Chemistry, 2010
This review represents the methods developed for the synthesis of phosphorus containing 1,2,4-triazine moieties. These methods depends on the phosphorylation of side functional groups of 1,2,4-triazines and cyclization of side functional groups of 1,2,4-triazines with phosphorus reagents to give isolated and fused phosphorus heterocyclic systems.
Reda Mohammady Abdel-Rahman, Magdy Ahmed Ibrahim, Tarik El-Sayed Ali   +2 more
openaire   +1 more source

Synthesis of 6-(2-Methoxynaphthyl)-2,3-dihydro-1,2,4-triazine-3-thione as a New Reagent for Spectrophotometric Determination of Copper

International Journal of Analytical Chemistry, 2014
A simple, sensitive, accurate, and green spectrophotometric method for the determination of Cu(II) using newly synthesized reagent, 6-(2-methoxynaphthyl)-2,3-dihydro-1,2,4-triazine-3-thione (MNDTT), has been developed.
Maliheh Barazandeh Tehrani, Hutan Ghanbari, Effat Souri, Fazel Shamsa, Mohsen Amini   +4 more
doaj   +1 more source

Heteroaromatization with 4-Hydroxycoumarin Part II: Synthesis of Some New Pyrano[2,3-d]pyrimidines, [1,2,4]triazolo[1,5-c]pyrimidines and Pyrimido[1,6-b]-[1,2,4]triazine Derivatives

Molecules, 2001
A variety of novel [1,2,4]triazolo[1,5-c]pyrimidine-13-ones (4a-f) and (5b-d) could be obtained via reaction of 9-amino-7-(4’-chlorophenyl)-8,9-dihydro-8-imino-6H,7H-[1]benzopyrano[3`,4`:5,6]pyrano[2,3-d]pyrimidine-6-one (3) with a variety of ...
A. H. Bedair, A. H. Fakery, N. A. El-Hady, M. S. Abd El-Latif, A. M. El-Agrody   +4 more
doaj   +1 more source

SYNTHETIC STUDIES IN THE 6H-[1,2,4] TRIAZINO [3,4-b] [ 1,3,4] THIADIAZINES [PDF]

Journal of Sciences, Islamic Republic of Iran, 1996
4-Amino-6-methyl- 1,2,4-triazine-3(2H)-thione-5-0ne (1) was condensed with propargyl bromidein the presence of sodium rnethoxide to afford 3-propargylmercapto- 4-arnino-6-rnethyl-1,2,4-triazin-5-one(2) .
doaj  

7-Dimethylamino-2-phenyl-1,2,4-triazolo[1,5-a][1,3,5]triazin-5-amine methanol solvatePart 11 in the series `Fused heterocyclic systems with an s-triazine ring'. For Part 10, see Dolzhenko et al. (2008).

Acta Crystallographica Section E, 2008
7-Dimethylamino-2-phenyl-1,2,4-triazolo[1,5-a][1,3,5]triazin-5-amine crystallized with one molecule of methanol to give the title compound, C12H13N7·CH3OH.
Wai Keung Chui, Su Fen Woo, Lip Lin Koh, Geok Kheng Tan, Anton V. Dolzhenko   +4 more
doaj   +1 more source

Structures and Chemical Equilibria of Some N-Heterocycles Containing Amide Linkages

Molecules, 2003
Structures and chemical equilibria of 5-carboxy-2-thiouracil (1), 5,6-diphenyl-3-hydroxy-1,2,4-triazine (2), 1-phenyl-3-methyl-5-pyrazolone (3) and 2-mercapto-4,6-dimethylpyrimidine hydrochloride (4) are reported.
N. H. Abd El Moneim, R. H. Ahmed, M. Abd El Zaher Mostafa, M. S. Masoud   +3 more
doaj   +1 more source

Synthesis and Structure-Activity Relationship of Some New Thiophene-Based Heterocycles as Potential Antimicrobial Agents

Molecules, 2016
Several new pyrazole, pyridine, [1,2,4]triazolo[1,5-α]pyrimidine, benzimidazo[1,2-a]pyrimidine and 1,2,4-triazolo[3,4-c][1,2,4]triazine derivatives incorporating a thiophene moiety were synthesized from (E)-ethyl 5-(3-(dimethylamino)acryloyl)-4-phenyl-2-(
Yahia Nasser Mabkhot, Fatima Alatibi, Nahed Nasser E. El-Sayed, Nabila Abdelshafy Kheder, Salim S. Al-Showiman   +4 more
doaj   +1 more source

Synthesis of 6-(Phenanthrene-3-yl)-2,3-dihydro-1,2,4,-triazine-3-thione as a New Reagent for the Non-Extractive Spectrophotometric Determination of Cu(II) [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2018
A simple, sensitive, and non-extractive spectrophotometric method was developed for the determination of copper (II) using a newly synthesized chromogenic reagent, 6-(phenanthrene-3-yl)-1,2,4,-triazine-3-thione(PhDTT), in Tween 80 neutral surfactant.
Marzieh Maskoot, Maliheh Barazandeh Tehrani, Mahdyeh Asaee, Effat Souri   +3 more
doaj