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Showing 1 to 20 of 20 for “"Nitrosation"”.
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Peroxynitrite-mediated oxidations: nitration and nitrosation
… and N-nitrosomorpholine. Nitration and nitrosation of morpholine are catalyzed by low levels of CO<sub>2</sub>; however, excess CO<sub>2</sub> dramatically reduces the yields of nitrosation but not nitration, and the combined yields of the products are about the same under conditions of …
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Activated carbon catalyzed nitrosamine formation via amine nitrosation
… pathway concerning the catalysis of amine nitrosation by activated carbon materials whose use is widespread in municipal and industrial systems. Experimental results show that this catalysis is highly pH dependent, with maximum formation achieved near the pKa value for each of the secondary …
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Nitrosation reactions of sym-diethyldiphenylurea and stabilizer degradation in double-base propellants
… objects of the present work was to study the nitrosation of centralite in order to achieve a better understanding of the action of this substance as a stabilizer for propellants. A second aim was to determine the content of centralite and its derivatives in the nitrocellulose residues …
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Studies of quinone monooximes derived from dihydroxyphenylalanines
This thesis is concerned with the nitrosation behaviour of 1,5-, 1,6- and 2,7-dihydroxynaphthalenes towards equimolar and excess sodium nitrite/acid. The direct and indirect methods of nitrosations have been used to prepare mono- and di-nitrosated products. Under all experimental conditions …
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ΜΕΛΕΤΗ ΑΝΤΙΔΡΑΣΕΩΝ ΕΤΕΡΟΚΥΚΛΙΚΩΝ ΑΡΩΜΑΤΙΚΩΝ ΝΙΤΡΩΔΑΜΙΝΩΝ
THE NITROSATION OF 4-METHYLAMINO-1-METHYL-PYRIDINIUM PERCHLORATE IN 0.1-4.0 N PERCHLORIC ACID IS OF FIRST ORDER IN AMINE AND NITROUS ACID AND FOLLOWS THE RATEEXPRESSION: R=K3 [AMINE] [NITROUS ACID] HO. (I) THE RESPECTIVE NITROSAMINE FORMED IS EASILY DENITROSATED UNDER THE EXPERIMENTAL CONDITIONS. …
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SYNTHESES AND ESTROGENICITY STUDY OF DIETHYLSTILBESTROL AND BISPHENOL-A ANALOGS AS POTENTIAL REPLACEMENT FOR BISPHENOL-A AND INVESTIGATION ON NOVEL REACTIONS INDUCED BY IODANE/QUATERNARY AMMONIUM HALIDES
… was utilized to explore aromatic bromination, N-nitrosation-dealkylation, and benzoate ester formation from benzylamines. Koser's reagent was found to be a suitable iodane for aromatic bromination reaction, whereas for N-nitrosation-dealkylation, IBX gave the best yields. Further, for …
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Studies of dietary nitrate induced nitrosative stress in the upper gastrointestinal tract
… in swallowed saliva by bacterially-catalysed nitrosation in the achlorhydric stomach or acid-catalysed nitrosation in the healthy acid secreting stomach. Protection against luminal acid-catalysed nitrosation is provided by the ascorbic acid content of human gastric juice which reduces nitrite …
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FROM BATCH TO FLOW: RETHINK THE WAY OF DOING CHEMISTRY
… photochemistry, alkyl nitrite in α-keto nitrosation reaction. The last section of every chapter is dedicated to the discussion of the result where on water organolithium addition to imines, Pd mediated cross coupling reactions, synthesis of benzoxaboroles, photochemical synthesis of …
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Chemistry and biological activity of iron quinoneoximic complexes
… 3-MehqoH] and 6-HehqoH] using the direct and the nitrosation methods was examined. The direct method gave rise to the complexes Fe(hqoH), OHjO, Fe(3-HehqoH), and Fe(6-MehqoH)2 '2H20 whereas the nitrosation method gave rise to ill-defined solids. Na[Fe(N-Acqo), ]-4H20 was obtained by nitrosation of …
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Nitrosative guanosine deamination : pyrimidine ring opening implications of effects in homogeneous solution as well as anisotropic environments
… and interstrand cross linking involving the nitrosation of exocyclic amino group of guanine, adenine and cytosine. The ingestion or inhalation of nitrosating reagents (NO[subscript x][superscript -] ) contained in foods, or the environments have been known to cause in vivo nitrosation. The …
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Studies of complexes derived from 5-acetylamino-1,2-benzoquinone 2-oxime and related ligands
… 2-oxine [5-AcqoH] results from the direct nitrosation of 3-acatylaminophenol together with its isomer 3-acetylamino-l,4-benzoquinone 4-oxine [3-AcqoH]. The quinone oximic structure of the former has been indicated by i.r. and n.m.r. studies. In the case of 3-AcqoH this type of structure has …
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Studies of 1,2-quinone monooximes and their metal complexes
… hydrochloric acid. Under these conditions, N-nitrosation was inhibited and the 1,2-benzoquinone- 2-oxlme hydrochlorides were formed. The 5-acylaminc1,2-benzoqulnone-2- oximes, 5-propionylamino-1,2-benzoquinone-2-oxime (5-PrqoH), 5-butyrylamino-l,2-benzoquinone-2-oxime (5-BuqoH), …
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Intimations on the Development of Effective Treatment for the Prevention of Preterm Birth: β3 Adrenergic Receptor Signaling in the Human Myometrium
… and BKCa. Our studies showed that NO mediated S-nitrosation of Cx43 promote a hemichannel state over a gap junction state. Together this research indicates the potential of β3AR as a target for developing tocolytic strategies involving combination therapy with mechanisms that have additive …
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I. Generation of dibromocarbene under neutral conditions; II. Generation and reactions of 11-carbena[4.4.1]propella-3,8-diene; III. The oxidation of cyclopropylidenes
… and discovered an unusual regioselectivity of nitrosation of norcarane ureas;Oxidation of carbenes with molecular oxygen yields intermediates such as carbonyl oxides and dioxiranes. These intermediates were orginally postulated in ozonolysis of alkenes. In recent years, many of these …
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EFFECTS OF RED BLOOD CELLS ON NITRIC OXIDE BIOACTIVITY
… bioactivation is involved surface protein nitrosation. Nitric oxide synthase (NOS) is an enzyme for converting L-arginine to NO and citrulline. Arginase as another enzyme converts L-arginine to urea and L-ornithine. Nor-NOHA as arginase inhibitor is supposed to block the arginase pathway so …
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Investigation into the role of DNA damage and repair during influenza infection and inflammation
… response. Second, we examined the effects of S-nitrosation, a post-translational modification that is common in inflammatory regions, on repair of alkylation damage. Influenza induces an excessive inflammatory response in the host and a reduction in inflammation reduces morbidity. While …
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Studies of 1,2-naphthoquinone mono-oximato complexes
… The trichelates were also obtained from the nitrosation of the appropriate naphthol in the presence of rhodium(Ill) chloride. In contrast, the corresponding reaction systems involving iridium gave very complex mixtures Involving both iridium containing species and organic products. One of the …