Ring-Substituted Benzohydroxamic Acids: 1H, 13C and 15N NMR Spectra and NHOH Proton Exchange

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F05%3A00028612" target="_blank" >RIV/67985858:_____/05:00028612 - isvavai.cz</a>
Alternative codes found
RIV/60461373:22340/05:00022520
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Ring-Substituted Benzohydroxamic Acids: 1H, 13C and 15N NMR Spectra and NHOH Proton Exchange
Original language description
NMR spectra (1H, 13C, 15N) of para- and meta-substituted benzohydroxamic acids were studied in dry dimethyl sulfoxide solutions. The 13C 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 15N chemical shifts. The 15N and 1H chemical shifts of the NHOH 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- andintermolecular exchange and the rates did not exhibit any simple relationship to the substituent constants.
Czech name
Benzhydroxamové kyseliny substituované na benzenovém jádře. 1H,13C, 15N NMR spektra a NHOH protonová výměna
Czech description
Zmíněná NMR spektra byla studována v roztocích DMSO. Uvedené kyseliny maji hydroxamovou strukturu a nikoliv hydroximovou. Vyměna probiha jak intra- tak i inetermolekulárně.

Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CC - Organic chemistry
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2005
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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