scholarly journals A PANI-Fe3O4@ZnO nanocomposite: a magnetically separable and applicable catalyst for the synthesis of chromeno-pyrido[d]pyrimidine derivatives

RSC Advances ◽  
2020 ◽  
Vol 10 (26) ◽  
pp. 15614-15621 ◽  
Author(s):  
Fatemeh Chaghari-Farahani ◽  
Shahrzad Abdolmohammadi ◽  
Reza Kia-Kojoori
Keyword(s):  
Aqueous Medium ◽  
Room Temperature ◽  
Pyrimidine Derivatives ◽  
Magnetically Separable

A PANI-Fe3O4@ZnO nanocomposite is used to prepare a series of novel chromeno-pyrido[d]pyrimidine derivatives in an aqueous medium at room temperature.

Photochemically Reversible Dimer Electroreduction Product of 2-Oxopurine

1977 ◽  
Vol 32 (7-8) ◽  
pp. 488-494 ◽  
Author(s):  
Barbara Czochralska ◽  
H. Fritsche ◽  
D. Shugar
Keyword(s):  
Free Radical ◽  
Quantum Yield ◽  
Aqueous Medium ◽  
Electrochemical Reduction ◽  
Room Temperature ◽  
Reduction Reaction ◽  
Reduction Product ◽  
Spectroscopic Techniques ◽  
Pyrimidine Derivatives ◽  
Neutral Aqueous Medium

Abstract The electrochemical reduction of 2-oxopurine in buffered aqueous medium was found to proceed via two successive one-electron additions. The initial one-electron step involves the addition of a proton, leading to formation of a free radical which rapidly dimerizes. At more negative potentials, reduction leads to formation of 1,6-dihydro-2-oxopurine. The product of reduction on wave I was isolated and identified by various spectroscopic techniques as the dimer 6,6′-bis-(1,6-dihydro-2-oxo-purine). In neutral aqueous medium this dimer reduction product (but not the product of reduction on wave II, 1,6-dihydro-2-oxopurine) underwent quantitative photochemical dissociation to the parent 2-oxopurine, with a quantum yield at 254 nm of 0.03. The dimer reduction product also quantitatively regenerated the parent monomer in an alkali-catalyzed reaction at room temperature. The proposed mechanism of the reduction reaction, and susceptibility of the reduction product to photodissociation, is compared with the corresponding behaviour of other purine, and pyrimidine, derivatives.

Synthesis of 2,3-dihydroquinazolinones and quinazolin-4(3H)-ones catalyzed by graphene oxide nanosheets in an aqueous medium: “on-water” synthesis accompanied by carbocatalysis and selective C–C bond cleavage

RSC Advances ◽  
2016 ◽  
Vol 6 (27) ◽  
pp. 22320-22330 ◽  
Author(s):  
Nazia Kausar ◽  
Indranil Roy ◽  
Dipankar Chattopadhyay ◽  
Asish R. Das
Keyword(s):  
Graphene Oxide ◽  
Aqueous Medium ◽  
Room Temperature ◽  
Bond Cleavage ◽  
Graphene Oxide Nanosheets ◽  
Graphene Oxide Nanosheet

Graphene oxide nanosheet catalyzed strategies for construction of 2,3-dihydroquinazolinones and quinazolin-4(3H)-ones starting from anthranilamide and an aldehyde/ketone in aqueous medium at room temperature have been realized.

pH‐Transformed ZnO‐NPs /NaPTS: The First Room‐Temperature Brisk Synthesis of Flavanones in Aqueous Medium

2018 ◽  
Vol 3 (46) ◽  
pp. 13197-13206 ◽  
Author(s):  
Bipin Shinde ◽  
Santosh B. Kamble ◽  
Dattaprasad M. Pore ◽  
Prasad Gosavi ◽  
Amol Gaikwad ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Room Temperature ◽  
Zno Nps

Can an ammonium-based room temperature ionic liquid counteract the urea-induced denaturation of a small peptide?

2017 ◽  
Vol 19 (11) ◽  
pp. 7772-7787 ◽  
Author(s):  
Soumadwip Ghosh ◽  
Souvik Dey ◽  
Mahendra Patel ◽  
Rajarshi Chakrabarti
Keyword(s):  
Ionic Liquid ◽  
Aqueous Medium ◽  
Room Temperature ◽  
Organic Molecules ◽  
Room Temperature Ionic Liquid ◽  
Small Peptide ◽  
Small Organic Molecules

The folding/unfolding equilibrium of proteins in aqueous medium can be altered by adding small organic molecules generally termed as co-solvents.

Metal-free synthesis of polysubstituted pyrroles using surfactants in aqueous medium

2017 ◽  
Vol 19 (22) ◽  
pp. 5385-5389 ◽  
Author(s):  
Amrendra Kumar ◽  
Ramanand Ramanand ◽  
Narender Tadigoppula
Keyword(s):  
Aqueous Medium ◽  
Sodium Dodecyl Sulphate ◽  
Room Temperature ◽  
Sodium Dodecyl ◽  
Pyrrole Derivatives ◽  
Metal Free ◽  
Triton X

An efficient and metal-free method has been developed for the synthesis of polysubstituted pyrrole derivatives with combination of sodium dodecyl sulphate (SDS) and Triton X-100 surfactants using water as a solvent at room temperature in 2–6 h and under microwave conditions (10 min) with good to excellent yields.

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