About: Electroreduction of Aromatic Oximes: Diprotonation, Adsorption, Imine Formation, and Substituent Effect

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Aromatic oximes are reduced in aqueous solution in a four-electron process. The reducible species in the pH range 5-8 is a diprotonated form of the oxime. This species is generated in the course of electrolysis in the vicinity of the electrode surface from the adsorbed neutral form of the oxime. The reduction is initiated by a cleavage of the N-O bond. The diprotonation facilitates the reduction process by the preformation of OH2 + as a good leaving group and by a positive charge on the azomethine nitrogen. Diprotonation has been proven based on shapes of i ) f(pH) plots, by observed shifts of half-wave potentials with pH and by comparison with the reduction of nitrones. Some observed deviations from theoretical i ) f(pH) plots were attributed to the role of adsorption on the rate of protonation. Adsorption is also responsible for dips on some of the i-E curves. Adsorption plays a role at concentrations as low as 1 10-5 M, when the electrode surface is still not fully covered. This indicates that c Aromatic oximes are reduced in aqueous solution in a four-electron process. The reducible species in the pH range 5-8 is a diprotonated form of the oxime. This species is generated in the course of electrolysis in the vicinity of the electrode surface from the adsorbed neutral form of the oxime. The reduction is initiated by a cleavage of the N-O bond. The diprotonation facilitates the reduction process by the preformation of OH2 + as a good leaving group and by a positive charge on the azomethine nitrogen. Diprotonation has been proven based on shapes of i ) f(pH) plots, by observed shifts of half-wave potentials with pH and by comparison with the reduction of nitrones. Some observed deviations from theoretical i ) f(pH) plots were attributed to the role of adsorption on the rate of protonation. Adsorption is also responsible for dips on some of the i-E curves. Adsorption plays a role at concentrations as low as 1 10-5 M, when the electrode surface is still not fully covered. This indicates that c (en) Byla studována redukce aromatických oximů ve vodných roztocích při různých hodnotách pH. Byl studován vliv substituentů na redukční potenciál. (cs)
Title	Electroreduction of Aromatic Oximes: Diprotonation, Adsorption, Imine Formation, and Substituent Effect Elektroredukce aromatických oximů: protonace, absorpce, tvorba iminů a substituční efekty (cs) Electroreduction of Aromatic Oximes: Diprotonation, Adsorption, Imine Formation, and Substituent Effect (en)
skos:prefLabel	Electroreduction of Aromatic Oximes: Diprotonation, Adsorption, Imine Formation, and Substituent Effect Elektroredukce aromatických oximů: protonace, absorpce, tvorba iminů a substituční efekty (cs) Electroreduction of Aromatic Oximes: Diprotonation, Adsorption, Imine Formation, and Substituent Effect (en)
skos:notation	RIV/60461373:22310/06:00016920!RIV07-MSM-22310___
http://linked.open.../vavai/riv/strany	6785-6796
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA203/01/1093), Z(MSM6046137301)
http://linked.open...iv/cisloPeriodika	3
http://linked.open...vai/riv/dodaniDat	2007
http://linked.open...aciTvurceVysledku	Pícha, Jan
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoká škola chemicko-technologická v Praze / Fakulta chemické technologie
http://linked.open...dnocenehoVysledku	473844
http://linked.open...ai/riv/idVysledku	RIV/60461373:22310/06:00016920
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Electroreduction; oximes; polarography; substituent effect (en)
http://linked.open.../riv/klicoveSlovo	Electroreduction oximes polarography substituent effect
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[40F0477F522B]
http://linked.open...i/riv/nazevZdroje	JOURNAL OF PHYSICAL CHEMISTRY B
http://linked.open...in/vavai/riv/obor	CC
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	The effect of electron distribution on the oxime reactivity towards esters
http://linked.open...UplatneniVysledku	2006
http://linked.open...v/svazekPeriodika	110
http://linked.open...iv/tvurceVysledku	Ludvík, Jiří Pícha, Jan Ekmekci, Guler Zuman, Petr Celik, Hayati
http://linked.open...n/vavai/riv/zamer	Catalytic processes in chemistry and chemical technology
issn	1520-6106
number of pages	12 (xsd:int)
http://localhost/t...ganizacniJednotka	22310

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