About: Ring-substituted benzohydroxamic acids: 1H, 13C and 15N NMR spectra and NH-OH proton exchange

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	NMR spectra (H-1, C-13, N-15) of para- and meta-substituted benzohydroxamic acids were studied in dry dimethyl sulfoxide solutions. The C-13 chemical shifts were very close to those found by cross-polarization magic angle spinning in solids, the hydroxamic (not hydroximic) structure of which is unambiguous. The hydroxamic structure of these acids in DMSO solutions was proved independently by their N-15 chemical shifts. The N-15 and H-1 chemical shifts of the NH-OH fragment showed excellent mutual dependences and dependences on the nature of the ring substituent. According to these dependences and ab initio energy calculations, all the acids assume the same Z conformation. Proton exchange between hydroxamic OH and NH groups in DMSO proceeded by both intra- and intermolecular exchange and the rates did not exhibit any simple relationship to the substituent constants. NMR spectra (H-1, C-13, N-15) of para- and meta-substituted benzohydroxamic acids were studied in dry dimethyl sulfoxide solutions. The C-13 chemical shifts were very close to those found by cross-polarization magic angle spinning in solids, the hydroxamic (not hydroximic) structure of which is unambiguous. The hydroxamic structure of these acids in DMSO solutions was proved independently by their N-15 chemical shifts. The N-15 and H-1 chemical shifts of the NH-OH fragment showed excellent mutual dependences and dependences on the nature of the ring substituent. According to these dependences and ab initio energy calculations, all the acids assume the same Z conformation. Proton exchange between hydroxamic OH and NH groups in DMSO proceeded by both intra- and intermolecular exchange and the rates did not exhibit any simple relationship to the substituent constants. (en)
Title	Ring-substituted benzohydroxamic acids: 1H, 13C and 15N NMR spectra and NH-OH proton exchange Ring-substituted benzohydroxamic acids: 1H, 13C and 15N NMR spectra and NH-OH proton exchange (en)
skos:prefLabel	Ring-substituted benzohydroxamic acids: 1H, 13C and 15N NMR spectra and NH-OH proton exchange Ring-substituted benzohydroxamic acids: 1H, 13C and 15N NMR spectra and NH-OH proton exchange (en)
skos:notation	RIV/60461373:22340/05:00022520!RIV10-MSM-22340___
http://linked.open...avai/riv/aktivita	P S Z
http://linked.open...avai/riv/aktivity	P(GA203/03/1566), P(IAA4072005), P(IAA4072605), P(LB98233), S, Z(AV0Z40720504)
http://linked.open...iv/cisloPeriodika	7
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Tkadlecová, Marcela Roithová, Jana Pataridis, Statis
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 chemicko-inženýrská
http://linked.open...dnocenehoVysledku	541152
http://linked.open...ai/riv/idVysledku	RIV/60461373:22340/05:00022520
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	NMR, 1H NMR; 13C NMR; 15N NMR; substituted benzhydroxamic acids; chemical shifts; substituent effects; proton exchange (en)
http://linked.open.../riv/klicoveSlovo	chemical shifts 13C NMR 15N NMR 1H NMR substituent effects NMR proton exchange substituted benzhydroxamic acids
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[284991C456F6]
http://linked.open...i/riv/nazevZdroje	Magnetic Resonance in Chemistry
http://linked.open...in/vavai/riv/obor	CB
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	7 (xsd:int)
http://linked.open...vavai/riv/projekt	NMR spectroscopy in solutions Derivatives of Hydroxylamine, Solid State and Solution Structure. VNMR NET - integrated network for collection, sharing and sophisticated processing of NMR data Structure and Spectra of Hydroxamic Acids and Their Derivatives under Various Conditions
http://linked.open...UplatneniVysledku	2005
http://linked.open...v/svazekPeriodika	43
http://linked.open...iv/tvurceVysledku	Schraml, Jan Tkadlecová, Marcela Roithová, Jana Pataridis, Statis Soukupová, L. Exner, O. Blechta, V.
http://linked.open...ain/vavai/riv/wos	000229841700005
http://linked.open...n/vavai/riv/zamer	Investigation of multiphase reacting systems for the design of processes important in synthesis and preparation of novel materials, in energy production and in environmental protection
issn	0749-1581
number of pages	8 (xsd:int)
http://localhost/t...ganizacniJednotka	22340

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