- Synthesis of new chelating agents 4-aminoantipyrine derivatives
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This paper reports the synthesis of three new 4-aminoantipyrine derivatives. The products was characterized by elemental analysis, UV, IR and 1HNMR spectra. The influence of different substituents on the preparation will be discussed.
- Gong, Qiaojuan,Yang, Wu,Gao, Jinzhang,Mo, Zunli,Kang, Jingwan
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- Synthesis and spectral investigations of pyridinium picrate
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This article describes the vibrational spectra of a crystalline compound called “Pyridinium Picrate. The vibrational spectra measurements were recorded as a function of temperature by both FT-IR and Raman spectroscopy. The presence of various functional g
- Meddour, Athmane,Azizi, Abdelkader
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- Dynamic NMR spectroscopy of three 2,2′-dialkyl/aryl-1-picrylhydrazines in liquid solution
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We have studied and compared the proton nuclear magnetic resonance spectra of a series of three 2,2′-di(alkyl/aryl)-1-(2,4,6-trinitrophenyl)hydrazines at 500 MHz in liquid toluene-d8, with a view to learning details of the internal conformation changes taking place, as a function of temperature. Herein "alkyl" denotes 'methyl', and "aryl" denotes 'phenyl'. The synthesis and characterization of 2-phenyl,2′-methyl-1-picrylhydrazine is reported. One goal of the present study was to afford a comparison with the oxidation products, i.e., the three corresponding hydrazyl free radicals - which show striking differences. All the hydrazine molecules in liquid solution occur as interconverting enantiomorphic pairs (atropisomers). Advanced techniques for obtaining the relevant activation energies and pseudo-thermodynamic parameters (Arrhenius and Eyring) have been utilized, and these parameters are listed and discussed. The three hydrazines turn out be very similar with respect to their internal dynamics.
- Brown,El-Bermani,Weil
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- POTENTIOMETRIC STUDIES ON THE REACTION OF PICRIC ACID WITH SOME AROMATIC AMINES IN METHYL ISOBUTYL KETONE
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The reaction between picric acid and some aniline and pyridine derivatives has been investigated in methyl isobutyl ketone by the potentiometric method.Overall picrate formation constants KBHA, ammonium cationic acid dissociation constants KBH+ and apparent ion-pair formation Ki* and dissociation Kd* constants have been determined.
- Smagowski, Henryk,Bartnicka, Halina
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p. 201 - 209
(2007/10/02)
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