Analysis of the ortho effect: acidity of 2-substituted benzoic acids

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F04%3A00011342" target="_blank" >RIV/60461373:22310/04:00011342 - isvavai.cz</a>
Alternative codes found
RIV/61388963:_____/04:00100787
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Analysis of the ortho effect: acidity of 2-substituted benzoic acids
Original language description
The classical term ortho effect was quantitatively analyzed and decomposed into its real or supposed components, using the acidity of eleven 2-substituted benzoic acids as a sample. The substituent effects were evaluated by calculations at the B3LYP/6-311+G(d,p) level by means of isodesmic reactions, separately for the acid molecules and for their anions. An intramolecular hydrogen bond, affecting the acidity moderately, was found only in the case of 2-methoxy- and 2-dimethylaminobenzoic acids. For theother acids, the often-employed interpretation invoking a hydrogen bond is wrong: the pertinent form was not revealed by calculations or by infrared spectroscopy. Another widespread explanation relying on the steric inhibition of resonance of the COOH group is also not correct in most cases: only some acid molecules are nonplanar (with substituents tert-Bu, CH2Cl, CF3, NO2, Cl) and the steric inhibition exists also in the anions, thus partly cancelling this effect.The main part of the or
Czech name
Analysis of the ortho effect: acidity of 2-substituted benzoic acids
Czech description
Analysis of the ortho effect: acidity of 2-substituted benzoic acids

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
<a href="/en/project/LN00A032" target="_blank" >LN00A032: Structure and dynamics of complex molecular systems and biomolecules</a><br>
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2004
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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