Results 11 to 20 of about 13,031 (233)

Pyrazine-2-substituted carboxamide derivatives: synthesis, antimicrobial and Leuconostoc mesenteroides growth inhibition activity [PDF]

Journal of the Serbian Chemical Society, 2006
Condensation of pyrazine-2,3-dicarboxylic acid anhydride with aminoacetophenones gave the corresponding N-(acetylphenyl)pyrazine-2-carboxamide. Their reactions with some electrophilic (carbonyl group, bromine) and nucleophilic (malononitrile, hydrazine ...
A. H. F. ABD EL-WAHAB, A. H. BEDAIR, F. A. EID, A. F. EL-HADDAD, A. M. ADAWY EL-DEEB, M. EL-SHERBINY   +5 more
doaj   +3 more sources

Tight-Binding Approach to Pyrazine-Mediated Superexchange in Copper–Pyrazine Antiferromagnets [PDF]

Inorganic Chemistry, 2021
We investigate the cause of spatial superexchange anisotropy in a family of copper-based, quasi-two-dimensional materials with very similar geometries. The compounds in this family differ mainly in their inter-layer separation but they have very different magnetic interactions, even within the basal plane.
E. P. Kenny, A. C. Jacko, B. J. Powell
openaire   +4 more sources

Syntheses and Photovoltaic Properties of New Pyrazine-Based Organic Photosensitizers for Dye-Sensitized Solar Cells

Energies, 2022
Three novel pyrazine-based organic photosensitizers denoted as TPP, TPPS, and TPPF were synthesized for dye-sensitized solar cell (DSSC) studies. Chemical structures of the pyrazine-based photosensitizers were designed with pyrazine derivatives as ...
Mi-Ra Kim, Thanh Chung Pham, Yeonghwan Choi, Seah Yang, Hyun-Seock Yang, Sung Heum Park, Mijeong Kang, Songyi Lee   +7 more
doaj   +1 more source

Natural Products–Pyrazine Hybrids: A Review of Developments in Medicinal Chemistry

Molecules, 2023
Pyrazine is a six-membered heterocyclic ring containing nitrogen, and many of its derivatives are biologically active compounds. References have been downloaded through Web of Science, PubMed, Science Direct, and SciFinder Scholar.
Guo-Qing Chen, Hong-Yan Guo, Zhe-Shan Quan, Qing-Kun Shen, Xiaoting Li, Tian Luan   +5 more
doaj   +1 more source

Mechanism of Enhancing Pyrazines in Daqu via Inoculating Bacillus licheniformis with Strains Specificity

Foods, 2023
Despite the importance of pyrazines in Baijiu flavor, inoculating functional strains to increase the contents of pyrazine in Daqu and how those interact with endogenic communities is not well characterized.
Qiuxiang Tang, Xiaoru Chen, Jun Huang, Suyi Zhang, Hui Qin, Yi Dong, Chao Wang, Xiaojun Wang, Chongde Wu, Yao Jin, Rongqing Zhou   +10 more
doaj   +1 more source

Experimental, DFT and QSAR models for the discovery of new pyrazines corrosion inhibitors for steel in oilfield acidizing environment

International Journal of Electrochemical Science, 2020
Eight (8) pyrazine derivatives were tested as mild steel corrosion inhibitors in a simulated oil field acidizing environment. Immersion tests and DFT calculations were adopted for the study. Immersion tests were carried out at 0.2 wt.
I.B. Obot, S.A. Umoren
doaj   +1 more source

Novel Triterpenoid Alkaloids With Their Potential Cytotoxic Activity From the Roots of Siraitia grosvenorii

Frontiers in Chemistry, 2022
Four novel triterpenoid alkaloids, siragrosvenins A–D (1–4), and two new cucurbitane-type triterpenoids, siragrosvenins E–F (5, 6), together with eight known analogs (7−14), were isolated from the roots of Siraitia grosvenorii.
Huijuan Wang, Guoxu Ma, Huaxiang Wang, Lingyu Li, Aijun Dong, Huiping Liu, Xiaoshuang Huo, Jianyong Si, Junchi Wang   +8 more
doaj   +1 more source

A Theoretical Study on the Photochemical Isomerization of 2,6-Dimethylpyrazine

Organics, 2022
DFT calculations on the photoisomerization of 2,6-dimethylpyrazine allowed us to confirm the role of benzvalene isomers in the isomerization of hexatomic heterocyclic compounds. 2,6-Dimethylpyrazine in the excited singlet states can be converted into the
Maurizio D’Auria
doaj   +1 more source

Antimicrobial and Odour Qualities of Alkylpyrazines Occurring in Chocolate and Cocoa Products

Applied Sciences, 2022
A total of 40 pyrazine compounds of cocoa and chocolate were discovered through a literature analysis. Data on the alkylpyrazines’ antibacterial properties were gathered.
Alina Cherniienko, Anna Pawełczyk, Lucjusz Zaprutko   +2 more
doaj   +1 more source

Dimethyl and diethyl esters of 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylic acid: a comparison

Acta Crystallographica Section E: Crystallographic Communications, 2016
In dimethyl 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylate, C18H14N4O4, (I), and diethyl 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylate, C20H18N4O4, (II), the dimethyl and diethyl esters of 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylic acid, the ...
Montserrat Alfonso, Helen Stoeckli-Evans
doaj   +1 more source