About: Two reduction waves of oximes and imine formation in acidic media

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The separation of the two two-electron waves in acidic media in solutions of some aromatic aldoximes and ketoximes is attributed to differences between the pK(a)-values of oximes (which are smaller than about 1.0) and those of protonated forms of corresponding in-tines. Dependences of halfwave potentials on pH show that the lower limit pK(a) of imine varies from -0.25 for p-formylbenzaldehyde oxime to 2.2 for p-fluorobenzaldehyde oxime. For the benzaldehyde and acetophenone oximes bearing substituents, which have pKa higher than -1.50, a good agreement was observed for pK(a)-values obtained spectrophotometrically and pK(ox) values obtained from the change in the slope of E-1/2(1) = f(H-0) plots. Past misrepresentations of the electroreduction mechanism of protonated forms of imines is attributed to insufficiently controlled compositions of supporting electrolytes. The separation of the two two-electron waves in acidic media in solutions of some aromatic aldoximes and ketoximes is attributed to differences between the pK(a)-values of oximes (which are smaller than about 1.0) and those of protonated forms of corresponding in-tines. Dependences of halfwave potentials on pH show that the lower limit pK(a) of imine varies from -0.25 for p-formylbenzaldehyde oxime to 2.2 for p-fluorobenzaldehyde oxime. For the benzaldehyde and acetophenone oximes bearing substituents, which have pKa higher than -1.50, a good agreement was observed for pK(a)-values obtained spectrophotometrically and pK(ox) values obtained from the change in the slope of E-1/2(1) = f(H-0) plots. Past misrepresentations of the electroreduction mechanism of protonated forms of imines is attributed to insufficiently controlled compositions of supporting electrolytes. (en) Separace dvou 2-elektronových redukčních vln aromatických aldoximů a ketoximů v kyselém prostředí je způsobena rozdílem mezi pKa výchozích oximů a pKa protonované formy příslušného iminového meziproduktu. Na základě elektrochemických dat bylo zjištěno, že hodnoty pKa studovaných iminů jsou mezi -1,5 až 2,2 a tyto výsledky byly potvrzeny spektrofotometricky. Byl diskutován vliv koncentrace halogenidů v základním elektrolytu. (cs)
Title	Two reduction waves of oximes and imine formation in acidic media Dvě redukční vlny oximů a tvorba iminů v kyselém prostředí (cs) Two reduction waves of oximes and imine formation in acidic media (en)
skos:prefLabel	Two reduction waves of oximes and imine formation in acidic media Dvě redukční vlny oximů a tvorba iminů v kyselém prostředí (cs) Two reduction waves of oximes and imine formation in acidic media (en)
skos:notation	RIV/61388955:_____/06:00085403!RIV08-MSM-61388955
http://linked.open.../vavai/riv/strany	5845;5852
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(1P05ME785), Z(AV0Z40400503)
http://linked.open...iv/cisloPeriodika	26
http://linked.open...vai/riv/dodaniDat	2008
http://linked.open...aciTvurceVysledku	Ludvík, Jiří
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	Ústav fyzikální chemie J. Heyrovského AV ČR, v.v.i.
http://linked.open...dnocenehoVysledku	504638
http://linked.open...ai/riv/idVysledku	RIV/61388955:_____/06:00085403
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	oximes; electroreduction; polarography (en)
http://linked.open.../riv/klicoveSlovo	oximes polarography electroreduction
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[CF13E3FA9FB2]
http://linked.open...i/riv/nazevZdroje	Electrochimica acta
http://linked.open...in/vavai/riv/obor	CG
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Chemical and electrochemical properties of oximes - antidotes against nervous gases
http://linked.open...UplatneniVysledku	2006
http://linked.open...v/svazekPeriodika	51
http://linked.open...iv/tvurceVysledku	Ludvík, Jiří Celik, H. Zuman, P.
http://linked.open...n/vavai/riv/zamer	Struktura, reaktivita a dynamika molekulárních a biomolekulárních systémů: teorie, experiment, aplikace
issn	0013-4686
number of pages	8 (xsd:int)

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