Linear free-energy relationship in the pyridinolysis of 2,4-dinitrophenyl p-chlorobenzoate in aqueous ethanol solution

1986 ◽  
Vol 51 (10) ◽  
pp. 1668-1672 ◽  
Author(s):  
Enrique A. Castro ◽  
Jose L. Valdivia
Keyword(s):  
Free Energy ◽  
Aqueous Ethanol ◽  
Ethanol Solution ◽  
Linear Free Energy Relationship ◽  
Aqueous Ethanol Solution ◽  
Linear Free Energy

Linear Free Energy Relationship Analysis of Solvent Effects on Singlet Oxygen Reactions

2003 ◽  
Vol 7 (9) ◽  
pp. 799-819 ◽  
Author(s):  
Else Lemp ◽  
Antonio Zanocco ◽  
Eduardo Lissi
Keyword(s):  
Free Energy ◽  
Singlet Oxygen ◽  
Solvent Effects ◽  
Linear Free Energy Relationship ◽  
Relationship Analysis ◽  
Linear Free Energy

Synthesis and characterization of a series of 1-methyl-4-[2-aryl-1-diazenyl]piperazines and a series of ethyl 4-[2-aryl-1-diazenyl]-1-piperazinecarboxylates

2004 ◽  
Vol 82 (8) ◽  
pp. 1294-1303 ◽  
Author(s):  
Vanessa Renée Little ◽  
Keith Vaughan
Keyword(s):  
Free Energy ◽  
Chemical Shifts ◽  
Linear Free Energy Relationship ◽  
Piperazine Ring ◽  
Linear Free Energy ◽  
In Series ◽  
Methylene Groups ◽  
Diazonium Coupling ◽  
The Difference

1-Methylpiperazine was coupled with a series of diazonium salts to afford the 1-methyl-4-[2-aryl-1-diazenyl]piperazines (2), a new series of triazenes, which have been characterized by 1H and 13C NMR spectroscopy, IR spectroscopy, and elemental analysis. Assignment of the chemical shifts to specific protons and carbons in the piperazine ring was facilitated by comparison with the chemical shifts in the model compounds piperazine and 1-methylpiperazine and by a HETCOR experiment with the p-tolyl derivative (2i). A DEPT experiment with 1-methylpiperazine (6) was necessary to distinguish the methyl and methylene groups in 6, and a HETCOR spectrum of 6 enabled the correlation of proton and carbon chemical shifts. Line broadening of the signals from the ring methylene protons is attributed to restricted rotation around the N2-N3 bond of the triazene moiety in 2. The second series of triazenes, the ethyl 4-[2-phenyl-1-diazenyl]-1-piperazinecarboxylates (3), have been prepared by similar diazonium coupling to ethyl 1-piperazinecarboxylate and were similarly characterized. The chemical shifts of the piperazine ring protons are much closer together in series 3 than in series 2, resulting in distortion of the multiplets for these methylenes. It was noticed that the difference between these chemical shifts in 3 exhibited a linear free energy relationship with the Hammett substituent constants for the substituents in the aryl ring. Key words: triazene, piperazine, diazonium coupling, NMR, HETCOR, linear free energy relationship.

scholarly journals Complex Coacervation and Overcharging during Interaction between Hydrophobic Zein and Hydrophilic Laponite in Aqueous Ethanol Solution

ACS Omega ◽  
2020 ◽  
Vol 5 (51) ◽  
pp. 33064-33074
Author(s):  
Preeti Tiwari ◽  
Indu Bharti ◽  
Himadri B Bohidar ◽  
Shabina Quadir ◽  
Mohan C Joshi ◽  
...  
Keyword(s):  
Aqueous Ethanol ◽  
Ethanol Solution ◽  
Complex Coacervation ◽  
Aqueous Ethanol Solution

Absorption Spectra of Substituted 2-Phenylindan-1,3-Dion-2-YL Radicals in Solution

1983 ◽  
Vol 38 (12) ◽  
pp. 1337-1341
Author(s):  
J. Zechner ◽  
N. Getoff ◽  
I. Timtcheva ◽  
F. Fratev ◽  
St. Minchef
Keyword(s):  
Free Energy ◽  
Absorption Spectra ◽  
Flash Photolysis ◽  
Bathochromic Shift ◽  
Substitution Effects ◽  
Linear Free Energy Relationship ◽  
Linear Free Energy

Abstract Flash photolysis of a series of 2-phenylindandione-1,3 derivatives substituted in the 4′ position results in both the formation of stable benzylidenephthalides and of phenylindan-1,3-dion-2-yl radicals. The u. v. absorption maxima of these radicals are dependent on the solvent and show a bathochromic shift upon substitution. These substitution effects were correlated by means of a linear free energy relationship. Attempts were made to draw conclusions concerning the changes in the gap of the states involved and their curvature due to substitution.

Correlation of Human and Animal Air-to-Blood Partition Coefficients With a Single Linear Free Energy Relationship Model

2008 ◽  
Vol 27 (9) ◽  
pp. 1130-1139 ◽  
Author(s):  
Laura M. Sprunger ◽  
Jennifer Gibbs ◽  
William E. Acree ◽  
Michael H. Abraham
Keyword(s):  
Free Energy ◽  
Partition Coefficients ◽  
Linear Free Energy Relationship ◽  
Linear Free Energy ◽  
Relationship Model

Kinetics and linear free energy relationship of wittig reaction between substituted benzaldehydes and substituted benzylidenetriphenylphosphorane

Tetrahedron ◽  
1986 ◽  
Vol 42 (15) ◽  
pp. 4161-4167 ◽  
Author(s):  
Li Donxia ◽  
Wu Dexian ◽  
Li Yaozhong ◽  
Zhao Huaming
Keyword(s):  
Free Energy ◽  
Wittig Reaction ◽  
Linear Free Energy Relationship ◽  
Linear Free Energy ◽  
Substituted Benzaldehydes ◽  
Relationship Of

Denaturation and aggregation of hen egg lysozyme in aqueous ethanol solution studied by dynamic light scattering

Biopolymers ◽  
2001 ◽  
Vol 59 (5) ◽  
pp. 370-379 ◽  
Author(s):  
Shinpei Tanaka ◽  
Yutaka Oda ◽  
Mitsuo Ataka ◽  
Kazuo Onuma ◽  
Satoru Fujiwara ◽  
...  
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Aqueous Ethanol ◽  
Ethanol Solution ◽  
Aqueous Ethanol Solution ◽  
Hen Egg ◽  
Hen Egg Lysozyme
Sign in / Sign up

Export Citation Format

Share Document