scholarly journals Bio-inspired NHC-organocatalyzed Stetter reaction in aqueous conditions

RSC Advances ◽  
2020 ◽  
Vol 10 (67) ◽  
pp. 40709-40718
Author(s):  
Mégane Debiais ◽  
Aladin Hamoud ◽  
Reihana Drain ◽  
Philippe Barthélémy ◽  
Valérie Desvergnes
Keyword(s):  
Aqueous Medium ◽  
Stetter Reaction ◽  
Aqueous Conditions

The first bio-inspired N-Heterocyclic Carbene (NHC)-catalyzed Stetter reaction in aqueous medium is reported with benzaldehyde and chalcone as model substrates.

Synthesis of coenzyme A thioesters using methyl acyl phosphates in an aqueous medium

2014 ◽  
Vol 12 (48) ◽  
pp. 9760-9763 ◽  
Author(s):  
Mohan Pal ◽  
Stephen L. Bearne
Keyword(s):  
Aqueous Medium ◽  
Carboxylic Acids ◽  
Coenzyme A ◽  
Aromatic Carboxylic Acids ◽  
Phosphate Monoesters ◽  
Aqueous Conditions ◽  
Acyl Phosphate

Regioselective S-acylation of coenzyme A is achieved under aqueous conditions using various aliphatic and aromatic carboxylic acids activated as their methyl acyl phosphate monoesters.

scholarly journals Absolute asymmetric Strecker synthesis in a mixed aqueous medium: reliable access to enantioenriched α-aminonitrile

2019 ◽  
Vol 17 (5) ◽  
pp. 1238-1244 ◽  
Author(s):  
Shinobu Miyagawa ◽  
Shohei Aiba ◽  
Hajime Kawamoto ◽  
Yuji Tokunaga ◽  
Tsuneomi Kawasaki
Keyword(s):  
Aqueous Medium ◽  
Spontaneous Resolution ◽  
Strecker Synthesis ◽  
Aqueous Conditions

Under aqueous conditions, total spontaneous resolution of α-aminonitrile occurred by the reaction of three achiral reagents; therefore, absolute asymmetric Strecker synthesis was demonstrated.

scholarly journals Prebiotic Phosphorylation of Uridine using Diamidophosphate in Aerosols

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
A. D. Castañeda ◽  
Z. Li ◽  
T. Joo ◽  
K. Benham ◽  
B. T. Burcar ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Slow Rate ◽  
Reaction Rates ◽  
Bulk Solution ◽  
Early Earth ◽  
Suitable Model ◽  
Proof Of Concept ◽  
Air Interface ◽  
Relevant Compound ◽  
Aqueous Conditions

Abstract One of the most challenging fundamental problems in establishing prebiotically plausible routes for phosphorylation reactions using phosphate is that they are thermodynamically unfavorable in aqueous conditions. Diamidophosphate (DAP), a potentially prebiotically relevant compound, was shown to phosphorylate nucleosides in aqueous medium, albeit at a very slow rate (days/weeks). Here, we demonstrate that performing these reactions within an aerosol environment, a suitable model for the early Earth ocean-air interface, yields higher reaction rates when compared to bulk solution, thus overcoming these rate limitations. As a proof-of-concept, we demonstrate the effective conversion (~6.5–10%) of uridine to uridine-2′,3′-cyclophosphate in less than 1 h. These results suggest that aerosol environments are a possible scenario in which prebiotic phosphorylation could have occurred despite unfavorable rates in bulk solution.

Rheological behaviour of the condensed suspension of fluorinated montmorillonite “rassoul” particles in aqueous medium

2005 ◽  
Vol 123 ◽  
pp. 341-344
Author(s):  
A. Khaldoun ◽  
F. González-Caballero ◽  
J. G. López-Durán ◽  
N. Mahrach ◽  
M. L. Kerkeb
Keyword(s):  
Aqueous Medium ◽  
Rheological Behaviour

Changes of Magnetic Characteristics of iron Oxides and Hydroxides in Aqueous Medium

2017 ◽  
Vol 39 (1) ◽  
pp. 46-52
Author(s):  
T. SAVCHENKO ◽  
◽  
A. GRECHANOVSKY ◽  
A. BRIK ◽  
N. DUDCHENKO
Keyword(s):  
Aqueous Medium ◽  
Iron Oxides ◽  
Magnetic Characteristics

Surface interaction of sweet potato peels (Ipomoea batata) with Cd(II) and Pb(II) ions in aqueous medium

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Aqueous Medium ◽  
Sweet Potato ◽  
Adsorption Process ◽  
Low Cost ◽  
Correlation Coefficients ◽  
Order Kinetic ◽  
Thermodynamic Evaluation ◽  
Dissociative Mechanism ◽  
Pseudo Second Order ◽  
Potato Peels

The removal of Cd(II) and Pb(II) ions from aqueous medium was studied using potato peels biomass. The adsorption process was evaluated using Atomic Absorption Spectrophotometer (AAS). The Vibrational band of the potato peels was studied using Fourier Transform Infrared Spectroscopy (FTIR). The adsorption process was carried out with respect to concentration, time, pH, particle size and the thermodynamic evaluation of the process was carried at temperatures of 30, 40, 50 and 60(0C), respectively. The FTIR studies revealed that the potato peels was composed of –OH, -NH, –C=N, –C=C and –C-O-C functional groups. The optimum removal was obtained at pH 8 and contact time of 20 min. The adsorption process followed Freundlich adsorption and pseudo second-order kinetic models with correlation coefficients (R2) greater than 0.900. The equilibrium adsorption capacity showed that Pb(II) ion was more adsorbed on the surface of the potato peels biomass versus Cd (II) ion (200.91 mg/g > 125.00 mg/g). The thermodynamic studies indicated endothermic, dissociative mechanism and spontaneous adsorption process. This study shows that sweet potato peels is useful as a low-cost adsorbent for the removal of Cd(II) and Pb(II) ions from aqueous medium.

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