scholarly journals Viscometric investigations and molecular interactions of some derivatives of 5-Substituted indole dihydropyrimidines in mixed organic solvents

2018 ◽  
Vol 35 (2) ◽  
pp. 23
Author(s):  
L. C. Heda ◽  
Rashmi Sharma ◽  
S. R. Mosalpuri ◽  
Pramod B. Chaudhari
Keyword(s):  
Organic Solvents ◽  
Molecular Interactions ◽  
Change Point ◽  
Solvent Mixture ◽  
Solvent Mixtures ◽  
Chemical Behavior ◽  
Viscosity Measurements ◽  
Aqueous Solvent ◽  
Benzene Concentration ◽  
Derivatives Of

Colloid chemical behavior of indole dihydropyrimidines in non-aqueous solvent mixture benzene-methanol of varying composition has been investigated by viscometric measurements at 303K± 0.1. The viscosity of the system increases with the increase in concentration. The Trend Change Point (TCP) values have been determined by intersection of two straightlines, which are found to be dependent on the composition of solvent  mixtures. The study confirms that the nature of synthesized compounds agglomerate formed below and above 50% benzene concentration is quite different. The viscometric data have been analyzed in terms of Einstein, Vand, Moulik and Jones-Dole equations. These well known equations have been successfully applied to explain the results of viscosity measurements and the viscometric parameters show that the behavior of compound changes in the proximity of 50% benzene concentration.

scholarly journals Metal-Free Photoredox Phosphonation of C–N and C–X Bonds in Aqueous Solvent Mixtures

2021 ◽  
Author(s):  
Lei Pan ◽  
Alexandra Kelley ◽  
Maria Victoria Cooke ◽  
Macy Deckert ◽  
Sébastien Laulhé
Keyword(s):  
Building Blocks ◽  
Solvent Mixture ◽  
Solvent Mixtures ◽  
Environmental Footprint ◽  
Reaction Conditions ◽  
Metal Free ◽  
Aqueous Solvent ◽  
Wide Range ◽  
Reaction Proceeds ◽  
Phosphonate Esters

Aryl phosphonate esters are valuable moieties for the pharmaceutical and agrochemical industries. Accessing such compounds from affordable and abundant phosphite reagents and a wide range of aromatic building blocks under metal-free, visible light-induced reaction conditions would represent a desirable technology. Herein, we present an efficient and mild methodology for the synthesis of aromatic phosphonate esters in good to excellent yields using DBU and phenothiazine as a photoredox catalyst. The reaction exhibits wide functional group compatibility enabling the transformation in presence of ketone, amide, ester, amine, and alcohol moieties. Importantly, the reaction proceeds using a green solvent mixture primarily composed of water, thus lowering the environmental footprint of this transformation compared to current methods.

Biocatalytic oxidation of polycyclic aromatic hydrocarbons in media containing organic solvents

1997 ◽  
Vol 36 (10) ◽  
pp. 37-44 ◽  
Author(s):  
Eduardo Torres ◽  
Raunel Tinoco ◽  
Rafael Vazquez-Duhalt
Keyword(s):  
Cytochrome C ◽  
Organic Solvents ◽  
Oxidation Mechanism ◽  
Site Directed Mutagenesis ◽  
Solvent Mixtures ◽  
Reaction Products ◽  
Prosthetic Group ◽  
Mass Transfer Limitation ◽  
Polycyclic Aromatic ◽  
Protein Environment

Lignin peroxidase, cytochrome c and haemoglobin were tested for oxidation of polycyclic aromatic hydrocarbon (PAH) in the presence of hydrogen peroxide. The reaction mixture Contained water-miscible organic solvents in order to reduce the mass transfer limitation of hydrophobic substrates. The reaction products from all three haemoproteins were mainly quinones, suggesting the same oxidation mechanism for the three biocatalysts. The haeme prosthetic group must have located in a protein environment for it to catalyze these reactions, and only certain types of protein environment are able to induce this type of haemebased catalytic activity. The solvent hydrophobicity is a factor affecting the biocatalysis in organic media. Substrate partitioning between the active site (haeme) and the bulk solvent is the main factor of the biocatalytic behaviour in organic solvent mixtures. Site-directed mutagenesis of yeast cytochrome c significantly altered the kinetic behaviour of the protein. The Gly82;Thr 102 variant was 10 times more active and showed a catalytic efficiency 10-fold greater than the wild-type iso-1-cytochrome c. These results suggest that it is possible to design a new biocatalyst for environmental purposes.

Self-assembly of sodium and potassium betulinates into hydro- and organo-gels: entrapment and removal studies of fluorophores and synthesis of gel–gold nanoparticle hybrid materials

RSC Advances ◽  
2016 ◽  
Vol 6 (21) ◽  
pp. 17290-17296 ◽  
Author(s):  
Braja Gopal Bag ◽  
Shib Shankar Dash
Keyword(s):  
Gold Nanoparticle ◽  
Hybrid Materials ◽  
Betulinic Acid ◽  
Self Assembly ◽  
Solvent Mixtures ◽  
Potassium Salts ◽  
Aqueous Solvent Mixtures ◽  
Aqueous Solvent ◽  
Removal Studies ◽  
Sodium And Potassium

Sodium and potassium salts of a renewable nano-sized triterpenoid betulinic acid have been prepared and their self-assembly properties in water and aqueous solvent mixtures have been studied.

A direct carbon-13 and nitrogen-15 NMR study of samarium(III) complexation with nitrate and isothiocyanate in aqueous solvent mixtures

1994 ◽  
Vol 23 (9) ◽  
pp. 1019-1047 ◽  
Author(s):  
A. Fratiello ◽  
V. Kubo-Anderson ◽  
E. Bolanos ◽  
O. Chavez ◽  
F. Laghaei ◽  
...  
Keyword(s):  
Solvent Mixtures ◽  
Aqueous Solvent Mixtures ◽  
Nmr Study ◽  
Aqueous Solvent

Synthesis of Red Luminescent Non Symmetric Styryl-4H-Pyran-4-Ylidene Fragment Containing Derivatives for Organic Light-Emitting Diodes

2011 ◽  
Vol 222 ◽  
pp. 271-274 ◽  
Author(s):  
Elmars Zarins ◽  
Janis Jubels ◽  
Valdis Kokars
Keyword(s):  
Organic Solvents ◽  
Spectral Properties ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Amorphous Films ◽  
Light Emitting ◽  
Organic Light ◽  
Volatile Organic ◽  
Derivatives Of

New organic glassy non symmetric styryl- derivatives of 2(2,6-substituted-4H-pyran-4-ylidene)-malononitrile, 2(2,6-substituted-4H-pyran-4-ylidene)-1H-indene-1,3(2H)-dione and 2(2,6-substituted-4H-pyran-4-ylidene)-pyrimidine-2,4,6(1H,3H,5H)-trione were synthesized. They form thin solid amorphous films from volatile organic solvents (DCM and chloroform). Their spectral properties have been studied.

Substitution of azide atNNN?N?-tetraethyldiethylenetriaminechlorogold-(III) in binary aqueous solvent mixtures

1979 ◽  
Vol 4 (3) ◽  
pp. 161-163 ◽  
Author(s):  
Michael J. Blandamer ◽  
John Burgess ◽  
Stephen J. Hamshere ◽  
Paul Wellings
Keyword(s):  
Solvent Mixtures ◽  
Aqueous Solvent Mixtures ◽  
Aqueous Solvent
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