Theoretical investigation of the intramolecular hydrogen bond formation, non-linear optic properties, and electronic absorption spectra of the 8-hydroxiquinoline

2007 ◽  
Vol 816 (1-3) ◽  
pp. 145-151 ◽  
Author(s):  
A.J. Camargo ◽  
H.B. Napolitano ◽  
J. Zukerman-Schpector
Keyword(s):  
Hydrogen Bond ◽  
Absorption Spectra ◽  
Intramolecular Hydrogen Bond ◽  
Theoretical Investigation ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Bond Formation ◽  
Hydrogen Bond Formation ◽  
Linear Optic ◽  
Intramolecular Hydrogen

Electronic absorption spectra of nitroanilines

1979 ◽  
Vol 44 (5) ◽  
pp. 1613-1618 ◽  
Author(s):  
Viktor Řehák ◽  
Vladimír Kadeřábek
Keyword(s):  
Molecular Structure ◽  
Hydrogen Bond ◽  
Absorption Spectra ◽  
Intramolecular Hydrogen Bond ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Electronic System ◽  
Intramolecular Hydrogen ◽  
Absorption Transitions

Electronic absorption spectra of N-alkyl and N-arylsubstituted 2,4-dinitro- and 2,6-dinitroanilines are discussed in the terms of energy and intensity of the energetically lowest absorption transitions and molecular structure (intramolecular hydrogen bond, sterical effects, hyperconjugation and increase of the π-electronic system of the molecule.

scholarly journals Synthesis of a Conformationally Stable Atropisomeric Pair of Biphenyl Scaffold Containing Additional Stereogenic Centers

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 643 ◽  
Author(s):  
Chi-Tung Yeung ◽  
Wesley Chan ◽  
Wai-Sum Lo ◽  
Ga-Lai Law ◽  
Wing-Tak Wong
Keyword(s):  
Hydrogen Bond ◽  
Intramolecular Hydrogen Bond ◽  
Bond Formation ◽  
Aldol Reaction ◽  
Spatial Arrangement ◽  
Hydroxyl Groups ◽  
Hydrogen Bond Formation ◽  
X Ray ◽  
Stereogenic Centers ◽  
Intramolecular Hydrogen

The synthesis of a new CF3-containing stereogenic atropisomeric pair of ortho-disubstituted biphenyl scaffold is presented. The atropisomers are surprisingly conformationally stable for isolation. X-ray structures show that their stability comes from an intramolecular hydrogen bond formation from their two hydroxyl groups and renders the spatial arrangement of their peripheral CF3 and CH3 groups very different. The synthesized stereogenic scaffold proved to be effective in catalyzing the asymmetric N-nitroso aldol reaction of enamine and nitrosobenzene. Compared to similar scaffolds without CF3 groups, one of our atropisomer exhibits an increase in enantioselectivity in this reaction.

Structural studies on the stereoisomerism of a natural dye miraxanthin I

2019 ◽  
Vol 43 (46) ◽  
pp. 18165-18174 ◽  
Author(s):  
Stanisław Niziński ◽  
Łukasz Popenda ◽  
Michał F. Rode ◽  
Agnieszka Kumorkiewicz ◽  
Zbigniew Fojud ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Intramolecular Hydrogen Bond ◽  
Bond Formation ◽  
Natural Dye ◽  
Torsional Motion ◽  
Structural Studies ◽  
Hydrogen Bond Formation ◽  
Intramolecular Hydrogen

Fluorescence in miraxanthin I is enhanced by intramolecular hydrogen bond formation hampering torsional motion around the central bonds.

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