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Statements

Subject Item
n2:RIV%2F60461373%3A22340%2F05%3A00022520%21RIV10-MSM-22340___
rdf:type
n8:Vysledek skos:Concept
dcterms: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.
dcterms: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
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
skos:notation
RIV/60461373:22340/05:00022520!RIV10-MSM-22340___
n4:aktivita
n11:S n11:P n11:Z
n4:aktivity
P(GA203/03/1566), P(IAA4072005), P(IAA4072605), P(LB98233), S, Z(AV0Z40720504)
n4:cisloPeriodika
7
n4:dodaniDat
n15:2010
n4:domaciTvurceVysledku
n5:8169985 n5:2213117 n5:2302411
n4:druhVysledku
n7:J
n4:duvernostUdaju
n12:S
n4:entitaPredkladatele
n14:predkladatel
n4:idSjednocenehoVysledku
541152
n4:idVysledku
RIV/60461373:22340/05:00022520
n4:jazykVysledku
n18:eng
n4:klicovaSlova
NMR, 1H NMR; 13C NMR; 15N NMR; substituted benzhydroxamic acids; chemical shifts; substituent effects; proton exchange
n4:klicoveSlovo
n9:13C%20NMR n9:proton%20exchange n9:chemical%20shifts n9:NMR n9:substituent%20effects n9:1H%20NMR n9:15N%20NMR n9:substituted%20benzhydroxamic%20acids
n4:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n4:kontrolniKodProRIV
[284991C456F6]
n4:nazevZdroje
Magnetic Resonance in Chemistry
n4:obor
n17:CB
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
7
n4:projekt
n6:IAA4072005 n6:IAA4072605 n6:GA203%2F03%2F1566 n6:LB98233
n4:rokUplatneniVysledku
n15:2005
n4:svazekPeriodika
43
n4:tvurceVysledku
Pataridis, Statis Tkadlecová, Marcela Blechta, V. Exner, O. Roithová, Jana Schraml, Jan Soukupová, L.
n4:wos
000229841700005
n4:zamer
n19:AV0Z40720504
s:issn
0749-1581
s:numberOfPages
8
n16:organizacniJednotka
22340