Synthesis of polyhydrazones by diazo coupling reaction of bisacetoacetamides with diazonium salts

2001 ◽  
Vol 46 (4) ◽  
pp. 285-290 ◽  
Author(s):  
Bum Jin Kim ◽  
Ji Young Chang ◽  
Chulhee Kim
Keyword(s):  
Coupling Reaction ◽  
Diazonium Salts ◽  
Diazo Coupling ◽  
Diazo Coupling Reaction

scholarly journals Antiradical and Antioxidative Activity of Azocalix[4]arene Derivatives: Combined Experimental and Theoretical Study

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 485 ◽  
Author(s):  
Jiaqi Ni ◽  
Lilin Lu ◽  
Yi Liu
Keyword(s):  
High Efficiency ◽  
Theoretical Study ◽  
Antioxidative Activity ◽  
Radical Scavenging ◽  
Coupling Reaction ◽  
Diazonium Salts ◽  
Substituent Group ◽  
Diazo Coupling ◽  
Diazo Coupling Reaction ◽  
Upper Rim

Developing antioxidants with high efficiency is fundamentally important for the protection of living cells and engineering materials against oxidative damage. In this present study, two azocalix[4]arene derivatives were synthesized via a diazo coupling reaction between calix[4]arene and diazonium salts. Their antiradical and antioxidative performances were evaluated by hydroxyl radical scavenging and pyrogallol autoxidation inhibition experiments. Combined with theoretical studies, the antiradical and antioxidative mechanisms have been explored. The results demonstrated that these two azocalix[4]arene derivatives both exhibited remarkable antiradical and antioxidative activity. The macrocyclic framework of the calix[4]arene and para-azo substituent group at the upper rim of calix[4]arene contributed synergistically and importantly to its excellent antiradical and antioxidant activity.

A novel synthesis of unsymmetrical azo aromatics inaccessible by diazo-coupling reaction

1989 ◽  
Vol 30 (51) ◽  
pp. 7253-7256 ◽  
Author(s):  
N.R. Ayyangar ◽  
S.N. Naik ◽  
K.V. Srinivasan
Keyword(s):  
Coupling Reaction ◽  
Novel Synthesis ◽  
Diazo Coupling ◽  
Diazo Coupling Reaction

scholarly journals A multicommuted flow analysis method for the photometric determination of amoxicillin in pharmaceutical formulations using a diazo coupling reaction

2011 ◽  
Vol 22 (2) ◽  
pp. 279-285 ◽  
Author(s):  
Sueny K. B Freitas ◽  
Valdinete Lins da Silva ◽  
Alberto N Araújo ◽  
Maria Conceição B. S. M Montenegro ◽  
Boaventura F Reis ◽  
...  
Keyword(s):  
Flow Analysis ◽  
Coupling Reaction ◽  
Pharmaceutical Formulations ◽  
Photometric Determination ◽  
Analysis Method ◽  
Diazo Coupling ◽  
Diazo Coupling Reaction

Synthesis of Azo Polyurethane-Urea and Investigation of its Thermo-Optic Properties

2016 ◽  
Vol 230 (2) ◽  
Author(s):  
Caihong Chen ◽  
Zhening Yang ◽  
Fengxian Qiu ◽  
Tianlin Cao ◽  
Guorong Cao ◽  
...  
Keyword(s):  
Coupling Reaction ◽  
Physical And Mechanical Properties ◽  
Isophorone Diisocyanate ◽  
Visible Spectroscopy ◽  
Diazo Coupling ◽  
Uv Visible ◽  
Diazo Coupling Reaction ◽  
The Fourier Transform ◽  
Azo Chromophore ◽  
Azo Polyurethane

AbstractAn azo chromophore molecular S(-)-1,2-bis(4-azophenyl-4-nitro)-ethylenediamine (OABANEDA) was synthesized with 4-nitroaniline and S(-)-1,2-diphenyl ethylenediamine by diazo-coupling reaction. The azo polyurethane-urea (OAAPUU) was obtained from OABANEDA, polyether diol (NJ-210) and isophorone diisocyanate (IPDI). The structure of OAAPUU was characterized by the Fourier transform infrared and UV-visible spectroscopy. The physical and mechanical properties of OAAPUU were investigated. The refractive index (

scholarly journals Diazo coupling reaction for the determination of biliverdin.

1991 ◽  
Vol 40 (8) ◽  
pp. 377-381
Author(s):  
Yuji SUZUKI ◽  
Yoshikatsu SAKAGISHI
Keyword(s):  
Coupling Reaction ◽  
Diazo Coupling ◽  
Diazo Coupling Reaction

Analytic Methods for Bilirubin in Blood Plasma

1961 ◽  
Vol 7 (6) ◽  
pp. 603-625 ◽  
Author(s):  
Derek Watson
Keyword(s):  
Blood Plasma ◽  
Critical Evaluation ◽  
Coupling Reaction ◽  
Spectrophotometric Methods ◽  
Analytic Methods ◽  
Diazo Coupling ◽  
Diazo Coupling Reaction ◽  
In Blood Plasma

Abstract A critical evaluation of existing colorimetric and spectrophotometric methods for the determination of bilirubin in blood plasma is presented. The stoichiometric equivalences of the reagents used in the diazo coupling reaction are re-evaluated. The elimination of turbidity is discussed, as well as methods using diazo-coupling promoters. Recommendations are made concerning the preservation of specimens to prevent oxidation and procedures that give maximal specificity for the type of bilirubin pigment being assayed.

scholarly journals The Diazo-coupling Reaction of Phenol in Organic Solvents. The Isomer Ratio

1974 ◽  
Vol 47 (9) ◽  
pp. 2351-2352 ◽  
Author(s):  
Hideo Yamada ◽  
Y\={o}ji Hashida ◽  
Shizen Sekiguchi ◽  
Kohji Matsui
Keyword(s):  
Organic Solvents ◽  
Coupling Reaction ◽  
Isomer Ratio ◽  
Diazo Coupling ◽  
Diazo Coupling Reaction
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