Results 21 to 30 of about 976 (164)

Ring Cleavage of Some Bicylic Compounds Derived from 1,2,4-Triazine [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 1995
Ring cleavage occurred when 1,2,4-triazino-1,2,4-triazines (3), (4) and (5) were treated with concentrated hydrochloric acid to yield N-substituted triazines (7) and (8). These confirm the given configuration assigned to the isomeric triazinotriazines. 6-
Majid M. Heravi, Mehdi Bakavoli, Zohreh Sadjadi Hashemi   +2 more
doaj  

Synthesis and Photophysical Properties of α-(N-Biphenyl)-Substituted 2,2′-Bipyridine-Based Push–Pull Fluorophores

Molecules, 2022
A series of new α-(N-biphenyl)-substituted 2,2′-bipyridines were obtained through the combination of the ipso-nucleophilic aromatic substitution of the C5-cyano group, aza-Diels–Alder and Suzuki cross-coupling reactions, starting from 5-cyano-1,2,4 ...
Ekaterina S. Starnovskaya, Dmitry S. Kopchuk, Albert F. Khasanov, Olga S. Taniya, Igor L. Nikonov, Maria I. Valieva, Dmitry E. Pavlyuk, Alexander S. Novikov, Grigory V. Zyryanov, Oleg N. Chupakhin   +9 more
doaj   +1 more source

A Direct Route to 6,6’-Disubstituted-2,2’-Bipyridines by Double Diels-Alder/retro Diels-Alder Reaction of 5,5’-bi-1,2,4-Triazines

Molecules, 2005
Inverse electron demand Diels-Alder reaction of functionalized 5,5’-bi-1,2,4- triazines with bicyclo[2.2.1]hepta-2,5-diene in boiling p-cymene leads to a range of 6,6’- disubstituted-2,2’-bipyridines in good yield.
D. Branowska
doaj   +1 more source

5,6-Dimethyl-1,2,4-triazin-3-amine [PDF]

Acta Crystallographica Section E Structure Reports Online, 2011
In the crystal structure of the title compound, C(5)H(8)N(4), adjacent mol-ecules are connected through N-H⋯N hydrogen bonds, resulting in a zigzag chain along [100]. The amino groups and heterocyclic N atoms are involved in further N-H⋯N hydrogen bonds, forming R(2) (2)(8) motifs.
Man-Hua Wu, Qi-Ming Qiu, Sen Gao, Qiong-Hua Jin, Cun-Lin Zhang   +4 more
openaire   +3 more sources

Microwave Assisted Synthesis of Some New Fused 1,2,4-Triazines Bearing Thiophene Moieties With Expected Pharmacological Activity

Molecules, 2011
Rapid and efficient solvent-free synthesis of 4-amino-3-mercapto-6-[2-(2-thienyl)vinyl]-1,2,4-triazin-5(4H)-one 1 under microwave irradiation is described. Some new fused heterobicyclic nitrogen systems such as 1,2,4-triazino[3,4-b][1,3,4]thiadiazinones,
Mosselhi A. Mosselhi, Mohamed M. Youssef, Hosam A. Saad   +2 more
doaj   +1 more source

MnO₂-Mediated Oxidative Cyclization of “Formal” Schiff’s Bases: Easy Access to Diverse Naphthofuro-Annulated Triazines

Molecules, 2022
A different type of MnO2-induced oxidative cyclization of dihydrotriazines has been developed. These dihydrotriazines are considered as a “formal” Schiff’s base.
Ramil F. Fatykhov, Igor A. Khalymbadzha, Ainur D. Sharapov, Anastasia P. Potapova, Nataliya N. Mochulskaya, Anton N. Tsmokalyuk, Alexandra V. Ivoilova, Polina N. Mozharovskaia, Sougata Santra, Oleg N. Chupakhin   +9 more
doaj   +1 more source

Copper‐ and Silver‐Catalyzed Reactions of Active Methylene Isocyanides: Facile Access to Highly Substituted Five‐ and Six‐Membered Heterocycles

Chemistry – A European Journal, EarlyView.
This review summarizes recent advances in copper‐ and silver‐catalyzed reactions of active methylene isocyanides for the synthesis of highly substituted five‐ and six‐membered heterocycles. Emphasis is placed on [3+n] cycloadditions, annulations, and asymmetric strategies, highlighting current limitations and future opportunities in heterocycle ...
Jimil George, Kyungsoo Oh
wiley   +1 more source

A new convenient synthesis of 3-hetaryl-pyrazolo[5,1-c][1,2,4]triazines

Journal of Advanced Research, 2012
Reactions of enaminones 2 with diazotized 5-amino-3-phenylpyrazole provide a convenient route to 3-[(4,5-disubstituted-pyrazol-3-yl)carbonyl]-pyrazolo[5,1-c][1,2,4]triazines.
Ahmad S. Shawali
doaj   +1 more source

Structural Design of MOF‐Based and MOF‐Derived Composites for Oxygen Evolution Electrocatalysis: Materials Innovation for Energy and Environmental Sustainability

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
This review provides an overview of recent developments in metal organic framework (MOF)‐based and MOF‐derived composites for efficient oxygen evolution reaction. This review also emphasizes the structural design of electrocatalyst, active site optimization, and emerging prospects of their use in practical electrolyzer systems.
Bhagyashri B. Kamble, Aditi De, Seung Joo Jang, Arun Karmkar, Venkatachalam Vinothkumar, Niyaz Mujawar, Subrata Kundu, Tae Hyun Kim   +7 more
wiley   +1 more source

Pyrazolo[4,3-e][1,2,4]triazines: Purine Analogues with Electronic Absorption in the Visible Region

Molecules, 2005
Synthesis of several pryrazolo[4,3-e][1,2,4]-triazines is described. Theabsorption spectrum of some 5-substituted derivatives was found to extend to the visibleregion.
Jacek Wierzchowski, Andrzej Rykowski, Mariusz Mojzych   +2 more
doaj   +1 more source