scholarly journals Synthesis of Some New 2-(3-Aryl-1-phenyl-4-pyrazolyl)-benzoxazoles Using Hypervalent Iodine Mediated Oxidative Cyclization of Schiff’s Bases

Molecules ◽  
2006 ◽  
Vol 11 (1) ◽  
pp. 43-48 ◽  
Author(s):  
Om Prakash ◽  
Kamaljeet Pannu ◽  
Ajay Kumar
Keyword(s):  
Oxidative Cyclization ◽  
Hypervalent Iodine ◽  
Schiff’S Bases ◽  
Schiff's Bases

Hypervalent iodine oxidation of phenolic schiff's bases: Synthesis of 2-arylbenzoxazoles

1997 ◽  
Vol 38 (15) ◽  
pp. 2621-2622 ◽  
Author(s):  
Rajender S. Varma ◽  
Rajesh K. Saini ◽  
Om Prakash
Keyword(s):  
Hypervalent Iodine ◽  
Schiff’S Bases ◽  
Schiff's Bases

Green Synthesis, Characterization, DPPH and Ferrous Ion-chelating (FIC) Activity of Tetrakis-Schiff’s Bases of Terephthalaldehyde

2019 ◽  
Vol 16 (3) ◽  
pp. 249-255
Author(s):  
Momin Khan ◽  
Umar Ali ◽  
Anis Ur Rahman ◽  
Muhammad Ibrahim ◽  
Abdul Hameed ◽  
...  
Keyword(s):  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Aromatic Aldehydes ◽  
Ferrous Ion ◽  
Future Research ◽  
Scavenging Activity ◽  
Schiff’S Bases ◽  
Schiff's Bases ◽  
Antioxidant Agents

Background: The role of small molecules as antioxidants to prevent the oxidation of other molecules and inhibit them from radical formation is the area of much interest to cure disease especially cancer. Moreover, the antioxidants play important role as stabilizers to prevent oxidation of fuels and lubricants. </P><P> Methods: In the present study, fifteen tetrakis-Schiff’s bases derivatives (1-15) were synthesized and screened for their antioxidant activities. Compounds 1-15 were synthesized by continuous stirring of reaction mixture of 1,4-bis (hydrazonomethyl)benzene (1 mmol) with various substituted aromatic aldehydes (2 mmol) in distilled water using acetic acid as catalyst at room temperature for 2-10 min. </P><P> Results: Our present study showed that all compounds are better ferrous ion-chelating agents except compound 1,4-bis((E)-((E)-(3,4-dimethoxybenzylidene)hydrazono)methyl)benzene (6) (IC50 = 329.26 &#177; 4.75 &#181;M) which has slightly low activity than the standard EDTA (IC50 = 318.40 &#177; 5.53 μM). In addition, DPPH radical scavenging activity of eleven compounds showed higher activity than the standard. However, remaining four compounds showed comparable radical scavenging activity to the standard DPPH (IC50 = 257.77 &#177; 4.60 &#181;M). </P><P> Conclusion: The series of fifteen Schiff’s bases (1-15) were synthesized and evaluated as antioxidants. From both assays, it has been demonstrated that most of the tetrakis-Schiff’s bases have potential to serve as leads for the development of antioxidant agents for future research.

Synthesis of Schiff's bases Derived from 2- Amino - 1,3,4- Thiadiazole and 1,3,4- Oxadiazole with Naphthaldehydes

2006 ◽  
Vol 9 (1) ◽  
pp. 21-28
Author(s):  
Emaad . T. bakir Al-Takrity ◽  
◽  
Ibtisam K. Jassim ◽  
Wissam K. Jassim ◽  
◽  
...  
Keyword(s):  
Schiff’S Bases ◽  
Schiff's Bases

Study of uranium/VI/ collection by two Schiff's bases obtained from chitosan

1987 ◽  
Vol 118 (2) ◽  
pp. 99-109 ◽  
Author(s):  
P. L. Lopez-de-Alba ◽  
B. Urbina ◽  
J. C. Alvarado ◽  
G. A. Andreu ◽  
J. A. Lopez
Keyword(s):  
Schiff’S Bases ◽  
Schiff's Bases

Microwave Assisted Synthesis of Schiff Bases: A Green Approach

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Mousumi Chakraborty ◽  
Sanjay Baweja ◽  
Sunita Bhagat ◽  
TejpalSingh Chundawat
Keyword(s):  
Microwave Irradiation ◽  
Microwave Power ◽  
Mass Spectra ◽  
Molar Ratio ◽  
Microwave Assisted Synthesis ◽  
Schiff’S Bases ◽  
Microwave Assisted ◽  
Green Approach ◽  
Schiff's Bases ◽  
Effects Of Temperature

Abstract In the present study Schiff’s bases are synthesized by the conventional as well as by microwave irradiation. Excellent yield within short reaction time is obtained using microwave irradiation along with other advantages like mild reaction condition, non-hazardous and safer environmental conditions. The effects of temperature, reactant molar ratio, and microwave power variation on yield are observed. Mathematical model has been developed using matlab software to obtain the yield as a function of microwave power. Kinetic study of the reaction has also been attempted. Schiff’s bases structures are confirmed by IR, 1HNMR, Mass Spectra and elemental analysis.

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