Accurate vapor–liquid equilibria were measured for the ternary system ethyl 1,1-dimethylethyl ether + n-heptane + 1-hexene using an isothermal total pressure cell. The experimental data were well correlated using Wohl expansion and Wilson, NRTL and UNIQUAC models. The system shows a slight posi...

The chiral intermediate (3R)-cis-3-acetyloxy-4-(1,1-dimethylethyl)-2-azetidinone 2 was prepared for the semi-synthesis of the new taxane 5, an orally active anticancer compound. The enantioselective enzymatic hydrolysis of cis-3-acetyloxy-4-(1,1-dimethylethyl)-2-azetidinone 1 to the correspondin...

A series of seven 5-aryl-1-(1,1-dimethylethyl)-3-trifluoromethyl-1H-pyrazoles [in which aryl: C6H5 (1); C6H4-4-F (2); C6H4-4-Cl (3); C6H4-4-Br (4); C6H4-4-I (5); C6H4-4-CH3 (6), C6H4-4-OCH3 (7)] and 5-aryl-1-(1,1-dimethylethyl)-1H-pyrazole [C6H4-4-NO2 (8)] was studied at the molecular and supram...

Iron-exchanged Wyoming montmorillonite (Fe3+-SWy-1) is quite an effective catalyst for the hydration of styrene derivatives. The yields and selectivities depend on the reaction conditions, with good efficiency attained using THF as solvent at 120°C. Fe3+-SWy-1 calcined at 300°C, and pillared c...

This work is concerned with the dissolution of cellulose in tetraallylammonium fluoride/DMSO; the thermal stability of electrolyte solution, and relevant mechanistic aspects of the biopolymer acylation. EMF measurements (fluoride ion-selective electrode) showed that the electrolyte is present as...

The alkaline stability of benzyltrimethylammonium, benzylmethylimidazolium and benzyldimethylimidazolium functionalized poly(arylene ether ketone) anion exchange membranes (AEMs) were investigated by conductivity change and NMR experiments. The corresponding small molecular model compounds were ...

A series of novel 4-benzyl-morpholine-2-carboxylic acid N′-[2-(4-benzoyl-phenoxy)-acetyl]-hydrazide derivatives 8a-j has been synthesized from (4-hydroxy-aryl)-aryl methanones through a multi-step reaction sequence and then evaluated for anti-proliferative activity in vitro against various type...

Endosperm tissue of cross-sectioned green arabica coffee beans was analyzed by the ambient ionization technique desorption electrospray ionization-mass spectrometry (DESI-MS) imaging and the spatial distribution of chlorogenic acids and sucrose across the bean endosperm was revealed. Quinic acid...

Coffee is one of the most popular and consumed beverages in the world with many positive health effects. In this study the chlorogenic acid lactones and cinnamoylshikimate esters, a subclass of phenolics, from seven commercial roasted Robusta coffee samples were detected and characterized by LC–...

Eleven new acyl quinic acid derivatives, 4-O-caffeoyl-3-O-syringoylquinic acid methyl ester (1), 4-O-caffeoyl-3-O-vanilloylquinic acid (2), 4-O-caffeoyl-3-O-vanilloylquinic acid methyl ester (3), 5-O-caffeoyl-3-O-vanilloylquinic acid (4), 5-O-caffeoyl-3-O-vanilloylquinic acid methyl ester (5), 5...

Yerba mate is a beverage rich in bioactive compounds popular in South America. Polyphenols and methylxanthines were qualitatively and quantitatively analyzed in four commercial brands of yerba mate, as well as the antioxidant capacity of the beverages. Using LC/MSn analysis, 58 polyphenols were ...

Diabetes mellitus (DM) is a metabolic disorder with numerous symptoms categorized via serves hyperglycemia effect along with altered fat, protein and carbohydrate metabolism mainly resultant from defects in insulin action/secretion or both. The aim of the current experimental study was to comfor...

The ‘one pot’ synthesis of 2,4-diphosphono-1,2,3,4-tetrahydroquinolines starting from quinolines and H-phosphonates has been developed. This transformation involves continuous twice hydrophosphonylation regioselectively and breaks up the aromatic stabilization, which features a simple system, ...

The rhodium(III)-catalyzed mild and site-selective C–H allylation of 2-arylbenzo[d]thiazoles and 2-arylbenzo[d]oxazoles with allylic phosphonates and allylic carbonates is described. This transformation provides an efficient construction of C2-allylated, crotylated and prenylated 2-arylbenzo[d]...

DCDMH-mediated phosphorylation of versatile thiols with H-phosphonates for the preparation of synthetically and biologically important thiophosphates was demonstrated. Without metal catalysts and other additives, phosphorylation occurred to give the desired products with good to excellent yields...

A series of phosphonate-containing compounds based on dibenzo[d,f][1,3,2]dioxaphosphepine 6-oxide (BPPO) is presented. BPPO is synthesized by a three–component condensation and is added to activated alkenes with systematically varied structure via phospha-Michael addition. Acrylates, α,β-unsa...

We have designed a new type of AZT and ddU phosphoramidate diesters containing various combinations of 2-, 3-, 4-aminopyridine and 2-, 3-, 4-hydroxypyridine moieties attached to the phosphorus center, as potential anti-HIV pronucleotides. Depending on the pKa values of the aminopyridines and the...

This study aims to present the effectiveness of different advanced oxidation processes (AOPs) as photolysis (UV mercury arc and Xe-arc), ozone, ozone/Hg-UV, and photocatalysis (suspended and immobilized TiO2) for the degradation of the fungicide mepanipyrim in aqueous solutions. A well-known com...

Five photodegradation products of metrafenone (MTF) and six of mepanipyrim (MEP) were identified in synthetic grape juice at 25 °C and the structures of the main reaction products established. The degradation of MTF and MEP was modelled by using three different strategies involving monitoring (...

The influence of mepanipyrim (Mep) and tetraconazole (Tetra) and their formulations (Mep-Form and Tetra-Form) on the chromatic characteristics of Mencía wines was evaluated. Fungicides were applied at concentrations corresponding to their Maximum Residue Levels (MRL) on grapes and at 2MRL. The ...