scholarly journals Synthesis of Cyclic Derivatives of Tartaric Acid by Condensing Alkyld-Tartrates with Aliphatic Ketones. (Optical Activity and Chemical Structure in Tartaric Acid. V)

1939 ◽  
Vol 14 (1) ◽  
pp. 19-22 ◽  
Author(s):  
Yojiro Tsuzuki
Keyword(s):  
Tartaric Acid ◽  
Optical Activity ◽  
Chemical Structure ◽  
Aliphatic Ketones ◽  
Derivatives Of

scholarly journals Optical rotatory power. I—A theoretical calculation for a molecule containing only isotropic refractive centres

1934 ◽  
Vol 144 (853) ◽  
pp. 655-675 ◽  
Keyword(s):  
Theoretical Calculation ◽  
Optical Activity ◽  
Chemical Structure ◽  
Central Atom ◽  
Optical Rotation ◽  
Rotatory Power ◽  
Theoretical Formula ◽  
Optical Rotatory ◽  
Present Communication ◽  
Optical Rotatory Power

Ever since the time of van’t Hoff and Le Bel the number investigations dependent on optical activity, or attempting to elucidate optical activity, has been very great, and it is remarkable that, even at the present time, there is no theoretical formula which gives the relation between the magnitude of the rotation and the chemical structure of the molecule concerned. The present communication supplies this want with regard to the molecule of the simplest asymmetric type: the molecule with four different groups attached to one central atom. Various special hypothese have been postulated to explain optical activity, but a few investigators have shown quite definitely that there is no necessity for any of these hypotheses. Born* and Oseen have shown independently that, if the molecule has a dissymmetric structure, the ordinary refractive properties of the atoms will account for an optical rotation. Gray* and de Mallemann have attempted calculations of formulæ for optical retatory power on this basis. However, it has not been possible to condense the numerous algebraic terms which occur in these calculaations into a compact form.

scholarly journals Preparation and Hydro-Lipophilic Properties of Selected Novel Chlorinated and Brominated N-Arylcinnamamides

Proceedings ◽  
2019 ◽  
Vol 41 (1) ◽  
pp. 11
Author(s):  
Tomas Strharsky ◽  
Timotej Jankech ◽  
Jiri Kos ◽  
Kristina Maricakova ◽  
Andrea Pramukova ◽  
...  
Keyword(s):  
High Performance ◽  
Chemical Structure ◽  
Antimicrobial Agents ◽  
Reversed Phase ◽  
Log P ◽  
Organic Modifier ◽  
Chromatography Method ◽  
P Values ◽  
Liquid Chromatography Method ◽  
Derivatives Of

A series of six di- and tri-halogenated N-arylcinnamanilides designed as anti-inflammatory and antimicrobial agents was prepared and characterized. Since it is known that lipophilicity significantly influences the biological activity of compounds, the hydro-lipophilic properties of these di- and tri-substituted N-arylcinnamanilides were investigated in the study. All the discussed derivatives of cinnamic acid were analyzed using the reversed-phase high performance liquid chromatography method to measure lipophilicity. The procedure was performed under isocratic conditions with methanol as an organic modifier in the mobile phase using an end-capped non-polar C18 stationary reversed-phase column. In the present study, the correlations between the logarithm of the capacity factor k and log P/Clog P values calculated in various ways as well as the relationships between the lipophilicity and the chemical structure of the studied compounds are discussed.

Chemical structure dependent electron transport in 9,10-bis(2-phenyl-1,3,4-oxadiazole) derivatives of anthracene

RSC Advances ◽  
2014 ◽  
Vol 4 (24) ◽  
pp. 12206 ◽  
Author(s):  
Arunandan Kumar ◽  
Priyanka Tyagi ◽  
M. Ananth Reddy ◽  
G. Mallesham ◽  
K. Bhanuprakash ◽  
...  
Keyword(s):  
Electron Transport ◽  
Chemical Structure ◽  
Oxadiazole Derivatives ◽  
Derivatives Of

Chemical structure and biological activity ofo-disubstituted derivatives of benzene

1967 ◽  
Vol 23 (12) ◽  
pp. 1038-1038 ◽  
Author(s):  
K. Boček ◽  
J. Kopecký ◽  
M. Krivucová
Keyword(s):  
Biological Activity ◽  
Chemical Structure ◽  
Derivatives Of
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