Results 41 to 50 of about 16,008 (266)

Crystal structure of 2,6-dimethyl-4-pyridone hemihydrate

Acta Crystallographica Section E: Crystallographic Communications, 2015
The title compound (systematic name: 2,6-dimethyl-1H-pyridin-4-one hemihydrate), C7H9NO·0.5H2O, has a single planar molecule in the asymmetric unit with the non-H atoms possessing a mean deviation from planarity of 0.021 Å.
Dalena M. Nguyen, Vasumathi Desikan, James A. Golen, David R. Manke   +3 more
doaj   +1 more source

Synthesis of Some Novel Heterocyclic and Schiff Base Derivatives as Antimicrobial Agents

Molecules, 2015
Treatment of 2,3-diaryloxirane-2,3-dicarbonitriles 1a–c with different nitrogen nucleophiles, e.g., hydrazine, methyl hydrazine, phenyl hydrazine, hydroxylamine, thiosemicarbazide, and/or 2-amino-5-phenyl-1,3,4-thiadiazole, afforded pyrazole, isoxazole ...
Mohamed E. Azab, Sameh A. Rizk, Abd El-Galil E. Amr   +2 more
doaj   +1 more source

2-Pyridone: monoclinic polymorph [PDF]

Acta Crystallographica Section E Structure Reports Online, 2009
تتكون الوحدة غير المتماثلة في مركب العنوان، C(5)H(5)NO، من جزيئتين مستقلتين ولكن متطابقتين تقريبًا من 2 -بيريدون، وتمثل شكلًا متعددًا أحادي الميل من شكل أورثو- روم- بيك (P2 (1)2(1)2(1)) [Penfold (1953▶). أكتا كريست .6، 591-600 ؛ أومس وآخرون. (1984▶). Z. Kristallogr.169، 185-200 ؛ Yang & Craven (1998▶). أكتا كريست. B54، 912-920]. ترتبط الحبيبات الجزيئية
Hadi D. Arman, Pavel Poplaukhin, Edward R. T. Tiekink   +2 more
openaire   +4 more sources

Recent Progress in Nitro-Promoted Direct Functionalization of Pyridones and Quinolones

Molecules, 2020
Nitro group is one of the most important functional groups in organic syntheses because its strongly electron-withdrawing ability activates the scaffold, facilitating the reaction with nucleophilic reagents or the Diels−Alder reaction.
Feiyue Hao, Nagatoshi Nishiwaki
doaj   +1 more source

Synthesis of 5-Aroyl-2-aryl-3-hydroxypyridin-4(1H)-ones

Molbank, 2023
A two-stage synthesis of 5-aroyl-2-aryl-3-hydroxypyridin-4(1H)-ones (56–66% overall yields) was carried out by refluxing 5-aroyl-3-(benzyloxy)-2-(het)aryl-4H-pyran-4-ones with ammonium acetate in AcOH and subsequent debenzylation.
Elena V. Steparuk, Dmitrii L. Obydennov, Vyacheslav Y. Sosnovskikh   +2 more
doaj   +1 more source

Rhodium(i)-catalyzed C6-selective C–H alkenylation and polyenylation of 2-pyridones with alkenyl and conjugated polyenyl carboxylic acids

Chemical Science, 2019
A versatile Rh(i)-catalyzed C6-selective decarbonylative C–H alkenylation of 2-pyridones with readily available alkenyl carboxylic acids has been developed.
Haoqiang Zhao, Xin Xu, Zhenli Luo, L. Cao, Bohan Li, Huanrong Li, Lijin Xu, Q. Fan, P. Walsh   +8 more
semanticscholar   +1 more source

Access to N-Substituted 2-Pyridones by Catalytic Intermolecular Dearomatization and 1,4-Acyl Transfer.

Angewandte Chemie, 2018
A novel rhodium-catalyzed dearomatization of O-substituted pyridines to access N-substituted 2-pyridones has been developed. A computational study suggests a mechanism involving the formation of a pyridinium ylide followed by an unprecedented 1,4-acyl ...
Guangyang Xu, Ping-Fan Chen, Pei-Kang Liu, S. Tang, Xinhao Zhang, Jiangtao Sun   +5 more
semanticscholar   +1 more source

A study of substituent effects on the NH bond in alkyl and aryl 4,6-disubstituted-3-cyano-2-pyridones [PDF]

Journal of the Serbian Chemical Society, 2007
Substituent effects on the IR stretching frequencies and 1H-NMR chemical shifts of the pyridone NH group in 4- and 6-disubstituted alkyl and aryl 3-cyano- 2-pyridones were investigated.
Mišić-Vuković Milica, Jovanović Slobodanka, Mijin Dušan, Csanadi Janos, Đoković Dejan   +4 more
doaj   +3 more sources

General Method for the Preparation of Substituted 2-Amino-4H,5H-pyrano[4,3-b]pyran-5-ones and 2-Amino-4H-pyrano[3,2-c]pyridine-5-ones

Molecules, 2000
Reaction of 4-hydroxy-6-methyl-2-pyrone (1a) as well as 4-hydroxy-6-methyl-2(1H)-pyridones (1b-d) with arylmethylene malononitriles or arylmethylene methyl cyanoacetates (2a-h) leads to the formation of the very stable 5,6-fused bicyclic 2-amino-4Hpyran ...
Dieter Heber, Ivo C. Ivanov, Edmont V. Stoyanov   +2 more
doaj   +1 more source

Ligand‐Enabled Nondirected and Regioselective Arylation of Internal Alkenes with Simple Arenes

Angewandte Chemie, Volume 137, Issue 16, April 11, 2025.
A regioselective insertion of (hetero) aryl groups into the C−C double bond of unactivated internal alkenes by nondirected arene‐C(sp2)−H activation has been achieved. The design and development of a new ligand‐supported palladium catalysis, enables quick access to trisubstituted alkenes, especially E‐1,2‐diarylalkenes, from unfunctionalized simple raw
Tianming Liu, Xi Deng, Yue Gao, Haofan Li, Yu Du, Weiping Su   +5 more
wiley   +2 more sources