Benzhydroximic Acids - NMR Study of Trimethylsilyl Derivatives.

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Benzhydroximic Acids - NMR Study of Trimethylsilyl Derivatives.

Popis výsledku v původním jazyce

NMR spectra (H-1 C-13, N-15, and Si-29) of trimethylsilylated para and meta substituted benzhydroxamic acids were studied in chloroform solutions. The silylation products have the structure of Z-O,O'-bis(trimethylsilyl) derivatives of benzhydroximic acid, independently of the ring substituent. According to aromatic proton chemical shifts, the geometry of the hydroximic group and its torsion angle with the ring plane are not affected by the para substituent. The chemical shifts of the nuclei in the hydroximic part of the molecule show surprisingly strong dependence on the remote ring substituent. The two Si-29 chemical shifts exhibit essentially the same sensitivity to substitution despite the fact that the Si(O-1) is one bond closer to the substituentthan the Si(O-4) silicon. It is suggested that while electron donor substituents increase the shielding of the silicon atoms they also increase the basicity of the oxygen in the Si-O moiety, thus leading to the stronger hydrogen bending w

Název v anglickém jazyce

Benzhydroximic Acids - NMR Study of Trimethylsilyl Derivatives.

Popis výsledku anglicky

NMR spectra (H-1 C-13, N-15, and Si-29) of trimethylsilylated para and meta substituted benzhydroxamic acids were studied in chloroform solutions. The silylation products have the structure of Z-O,O'-bis(trimethylsilyl) derivatives of benzhydroximic acid, independently of the ring substituent. According to aromatic proton chemical shifts, the geometry of the hydroximic group and its torsion angle with the ring plane are not affected by the para substituent. The chemical shifts of the nuclei in the hydroximic part of the molecule show surprisingly strong dependence on the remote ring substituent. The two Si-29 chemical shifts exhibit essentially the same sensitivity to substitution despite the fact that the Si(O-1) is one bond closer to the substituentthan the Si(O-4) silicon. It is suggested that while electron donor substituents increase the shielding of the silicon atoms they also increase the basicity of the oxygen in the Si-O moiety, thus leading to the stronger hydrogen bending w

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CC - Organická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2000

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Organometallic Chemistry

ISSN

0022-328X

e-ISSN

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Svazek periodika

597

Číslo periodika v rámci svazku

1-2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

200-205

Kód UT WoS článku

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EID výsledku v databázi Scopus

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