Results 31 to 40 of about 22,715 (251)

Cysteine Thioaldehydes: Photolytic Generation, Reactivity, and Biological Implications

Angewandte Chemie, EarlyView.
Photolysis of cysteine phenacylsulfides bearing non‐conjugating electron‐withdrawing substituents leads to high conversions into cysteine thioaldehydes through a Norrish type‐II pathway. This methodology enabled the study of the aqueous reactivity of these important biosynthetic intermediates, which, depending on peptide sequence, pH and buffer ...
Ardra Karthika, Matthew Murray, Guillermo Palop, Lee‐Ann J. Keane, Patrick McArdle, Nicholas D. J. Yates, Christopher D. Spicer, Alison Parkin, Martin A. Fascione, Eddie L. Myers   +9 more
wiley   +2 more sources

Crystal structure of catena-poly[[(dimethyl sulfoxide-κO)(pyridine-2,6-dicarboxylato-κ3O,N,O′)nickel(II)]-μ-pyrazine-κ2N:N′]

Acta Crystallographica Section E: Crystallographic Communications, 2016
The title coordination polymer, [Ni(C7H3NO4)(C4H4N2)(C2H6OS)]n, consists of [010] chains composed of NiII ions linked by bis-monodentate-bridging pyrazine molecules. Each of the two crystallographically distinct NiII ions is located on a mirror plane and
Chen Liu, Annaliese E. Thuijs, Ashley C. Felts, Hamza F. Ballouk, Khalil A. Abboud   +4 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

Introducing Diradicaloid Thiele's Hydrocarbon Derivatives as Ligand in Transition Metal Chemistry

Angewandte Chemie, EarlyView.
N‐doped Thiele's hydrocarbon derivative is introduced as a ligand for the synthesis of mono‐ and bimetallic rhodium complexes as well as cyclometalated iridium complexes. These compounds constitute the first metal complexes based on a Thiele's hydrocarbon (or p‐quinodimethane) derivative and, to the best of our knowledge, the first cyclometalated ...
Alok Mahata, Nicolás. I. Neuman, Biprajit Sarkar   +2 more
wiley   +2 more sources

5,31-Diaza-2,8,15,18,21,28,34,41,44,47-decaoxaheptacyclo[46.4.0.04,32.06,30.09,14.022,27.035,40]dopentaconta-1(48),4,6(30),9(14),10,12,22(27),23,25,31,35(40),36,38,49,51-pentadecaene monohydrate

IUCrData, 2016
In the title compound, C40H40N2O10·H2O, each dual 17-crown-5 unit crystallizes with one solvent water molecule. The crown units are connected by a pyrazine ring. One oxo group in a crown moiety is disordered over two sites, with a refined occupancy ratio
Jong Sik Kim, Jai Young Lee, So Yeon Lee, Tae Yeon Lee, Wonbo Sim   +4 more
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

A Modular Synthesis of C5‐Sulfenyl Thiazoles via an Intermolecular Pummerer Rearrangement: An Underexplored Scaffold for Medicinal Chemistry

Angewandte Chemie, EarlyView.
Modular access to underexplored C5‐sulfenyl thiazoles via an intermolecular Pummerer rearrangement is reported. The methodology exhibits a broad functional group tolerance enabling the seamless design of trisubstituted thiazole cores bearing a sulfur handle for further elaboration.
Joe L. Smy, Theo C. Webb, Barnaby W. Greenland, S. Mark Roe, John Spencer, Storm Hassell‐Hart   +5 more
wiley   +2 more sources

From Quinoxaline, Pyrido[2,3-b]pyrazine and Pyrido[3,4-b]pyrazine to Pyrazino-Fused Carbazoles and Carbolines

Molecules, 2018
2,3-Diphenylated quinoxaline, pyrido[2,3-b]pyrazine and 8-bromopyrido[3,4-b]pyrazine were halogenated in deprotometalation-trapping reactions using mixed 2,2,6,6-tetramethyl piperidino-based lithium-zinc combinations in tetrahydrofuran.
Frédéric Lassagne, Timothy Langlais, Elsa Caytan, Emmanuelle Limanton, Ludovic Paquin, Manon Boullard, Coline Courtel, Idriss Curbet, Clément Gédéon, Julien Lebreton, Laurent Picot, Valérie Thiéry, Mohamed Souab, Blandine Baratte, Sandrine Ruchaud, Stéphane Bach, Thierry Roisnel, Florence Mongin   +17 more
doaj   +1 more source

Iridium-Catalyzed Ionic Hydrogenation of Multi-Aza Heterocycles. [PDF]

Angew Chem Int Ed Engl
Saturated nitrogen‐containing heterocycles are ubiquitous in bioactive molecules and are thus attractive synthetic targets. A readily accessible cyclometalated iridium(III) complex reduces 14 different aromatic aza heterocycles to (partially)saturated multi aza‐heterocycles enlarging accessible chemical space while displaying high tolerance toward ...
Despois A, Cramer N.
europepmc   +3 more sources

Pyrazine-Fused Porous Graphitic Framework-Based Mixed Matrix Membranes for Enhanced Gas Separations

, 2020
Membrane-based separations can mitigate the capital- and energy-intensive challenges associated with traditional thermally driven processes. To further push the boundary of gas separations, mixed matrix membranes (MMMs) have been extensively exploited ...
Yi Liu (36759), Jeffrey J. Urban (1321461), Canghai Ma, Jian Zhang, Canghai Ma (6405560), Xinle Li (150923), Jeffrey J. Urban, Xinle Li, Yi Liu, Jian Zhang (1682)   +9 more
core   +1 more source