NMR Spectral Studies of Interactions Between the Accelerants SPS and MPS and Copper Chlorides

2011 ◽  
Vol 158 (3) ◽  
pp. D143 ◽  
Author(s):  
Elizabeth Garcia-Cardona ◽  
Edward H. Wong ◽  
Dale P. Barkey
Keyword(s):  
Spectral Studies ◽  
Copper Chlorides

Electronic and vibrational spectral studies of dihalogenotoluenes

1984 ◽  
Vol 81 ◽  
pp. 549-555 ◽  
Author(s):  
R.K. Goel
Keyword(s):  
Spectral Studies

Nickel (II) and oxovanadium (IV) complexes supported on MCM-41 mesoporous and their application in catalytic selective sulfide and thiol oxidation

2020 ◽  
Vol 23 ◽  
Author(s):  
Mohsen Nikoorazm ◽  
Maryam Khanmoradi ◽  
Masoumeh Sayadian
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Sol Gel ◽  
Reaction Times ◽  
Significant Loss ◽  
Spectral Studies ◽  
High Catalytic Activity ◽  
Catalytic Systems ◽  
Solvent Free Conditions ◽  
Mcm 41

Introduction:: MCM-41 was synthesized using the sol-gel method. Then two new transition metal complexes of Nickel (II) and Vanadium (IV), were synthesized by immobilization of adenine (6-aminopurine) into MCM-41 mesoporous. The compounds have been characterized by XRD, TGA, SEM, AAS and FT-IR spectral studies. Using these catalysts provided an efficient and enantioselective procedure for oxidation of sulfides to sulfoxides and oxidative coupling of thiols to their corresponding disulfides using hydrogen peroxide at room temperature. Materials and Methods:: To a solution of sulfide or thiol (1 mmol) and H2O2 (5 mmol), a determined amount of the catalyst was added. The reaction mixture was stirred at room temperature for the specific time under solvent free conditions. The progress of the reaction was monitored by TLC using n-hexane: acetone (8:2). Afterwards, the catalyst was removed from the reaction mixture by centrifugation and, then, washed with dichloromethane in order to give the pure products. Results:: All the products were obtained in excellent yields and short reaction times indicating the high activity of the synthesized catalysts. Besides, the catalysts can be recovered and reused for several runs without significant loss in their catalytic activity. Conclusion:: These catalytic systems furnish the products very quickly with excellent yields and VO-6AP-MCM-41 shows high catalytic activity compared to Ni-6AP-MCM-41.

Synthesis, Spectral Studies and Anti-Bacterial Activity of Novel Substituted aryl/heteroaryl-(12-substituted phenyl-12H-7-oxa-8, 10-diazabenzo[ a]anthracen-11-yl)-amine

2009 ◽  
Vol 6 (6) ◽  
pp. 451-455 ◽  
Author(s):  
K. Mahammed ◽  
K. Venugopala ◽  
P. Arunachalam ◽  
K. Raju
Keyword(s):  
Bacterial Activity ◽  
Spectral Studies

Alumina-K3PO4 Solid Supported Microwave Synthesis of 1, 3-diaryl-2- propene-1-one Derivatives as a Prominent Antioxidant Scavenger

2020 ◽  
Vol 7 (2) ◽  
pp. 145-156
Author(s):  
Pravinkumar Patil ◽  
Gangadhar Bhopalkar ◽  
Sainath Zangade
Keyword(s):  
Antioxidant Activity ◽  
Reaction Time ◽  
Microwave Irradiation ◽  
Spectral Studies ◽  
Hydroxy Derivative ◽  
Scavenging Activity ◽  
Short Reaction Time ◽  
Basic Alumina ◽  
Ic50 Value ◽  
Nitric Oxide Radical

Background: The various industrial processes have a diverse effect on the environment through pollution. In view of these observations, some environmentally benign synthetically protocols have developed under green chemistry. For rapid and sustainable synthesis, the microwave irradiation (MI) has gained popularity as a powerful tool compared to conventional synthesis. The present study describes the synthesis of novel substituted 1, 3-diaryl-2-propene-1-one derivative using alumina supported K3PO4-MWI combination. Objective: Chalcones are important compounds which are widely spread in nature like in fruits, vegetables, tea, spices, etc. The 2’-hydroxy derivative of chalcones plays an important role in the synthesis of bioactive compounds. The present communication deals with a convenient and rapid synthesis of 1, 3-diaryl-2-propene-1-one under the support of alumina-tripotassium phosphate and microwave irradiation. Our efforts are focused on the introduction of typical and easier route for the synthesis of title compounds using a microwave. All synthesized chalcones have been screened and evaluated for the antioxidant activity by DPPH and nitric oxide radical scavenging. Some of these compounds are found to be more potent scavengers and may lead to the development of a new class of antioxidants. Methods: The α, β-unsaturated carbonyl functionality contains two electrophilic centers allowing them to undergo addition and cyclization reactions with different nucleophiles. In the literature survey, we found that Chalcones were synthesized using tripotassium phosphate catalyst under refluxing by a conventional method. A novel method for the synthesis of 1, 3-diaryl-2-propene-1-one via Claisen Schmidt has been introduced by reacting substituted 2’- hydroxyl acetonaphthones with substituted aromatic aldehydes under the support of basic alumina –tripotassium phosphate via microwave radiations. Formation of corresponding Chalcones was confirmed by spectral studies followed by their screening for antioxidant activity. The scavenging activity is expressed in terms of % inhibition and IC50 value (μg/ml). Results: The structures of newly synthesized Chalcones were confirmed and in good agreement with obtained spectral analysis such as IR, NMR, Mass and elemental analysis. Commercially available basic alumina and tripotassium phosphate in combination of microwave were utilized and found to be effective, convenient route for the synthesis of 1, 3-diaryl-2-propene-1-one derivatives with desirable yields in short reaction time (5-12 min). The results of antioxidant activity revealed that the IC50 value for compounds 3a, 3d, 3e, 3f, 3g, 3h, 3j, 3l and 3n are lower than that of standard ascorbic acid to scavenge DPPH radical. This indicates that these compounds are more significant scavengers in comparison with standard drug. On the other hand, compounds 3a, 3b, 3c, 3d, 3g, 3l and 3n are more potent scavengers for NO free radical. Conclusion: We have introduced an efficient, ecofriendly, simple and fast microwave assisted method using basic alumina-tripotassium phosphate for the synthesis of 1, 3-diaryl-2-propene-1- one derivatives. Microwave irradiation provides an effective way for the preparation of Chalcones in terms of several advantages as a simple procedure, short reaction time, milder reaction condition, cleaner reaction and excellent yield. The scavenging activity of chalcones against DPPH and NO free radicals showed excellent properties of antioxidants.

Mass spectral studies of some [2.2]paracyclophanylethene derivatives

1987 ◽  
Vol 22 (10) ◽  
pp. 693-696 ◽  
Author(s):  
Aboul-Fetouh E. Mourad
Keyword(s):  
Spectral Studies ◽  
Mass Spectral

scholarly journals Ultraviolet Spectral Studies of Acid- and Base-denatured Ribonuclease

1961 ◽  
Vol 236 (6) ◽  
pp. 1706-1710 ◽  
Author(s):  
Charles C. Bigelow
Keyword(s):  
Spectral Studies ◽  
Acid And Base

scholarly journals Chromatographic and Mass Spectral Studies on Isobaric and Isomeric Substances Related to 3,4-Methylenedioxymethamphetamine

2004 ◽  
Vol 42 (9) ◽  
pp. 464-469 ◽  
Author(s):  
L. Aalberg ◽  
C. R. Clark ◽  
J. DeRuiter
Keyword(s):  
Spectral Studies ◽  
Mass Spectral

scholarly journals Spectral studies of conformational changes induced in beta-glucuronidase by saccharo-1,4-lactone.

1975 ◽  
Vol 250 (7) ◽  
pp. 2739-2744
Author(s):  
RK Keller ◽  
O Touster
Keyword(s):  
Conformational Changes ◽  
Spectral Studies

scholarly journals Spectral studies of horse heart porphyrin cytochrome c.

1984 ◽  
Vol 259 (11) ◽  
pp. 6931-6936
Author(s):  
J M Strottmann ◽  
A Stellwagen ◽  
C Bryant ◽  
E Stellwagen
Keyword(s):  
Cytochrome C ◽  
Spectral Studies
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