A series of novel 4-hydroxybenzaldehyde derivatives were synthesized and their inhibitory effects on the diphenolase activity of mushroom tyrosinase were investigated. Most of target compounds had more potent inhibitory activities than the parent compound 4-hydroxybenzaldehyde (IC50 = 1.22 mM). ...
We reported an efficient ligand-free Co(OAc)2·4H2O/NaOH/O2/ethylene glycol reaction system that enables selective aerobic oxidation of a wide range of substrates covering 2,6-di-EWG-, 2,3,6-tri-EWG-, 2-EWG-, and 2-EWG-6-EDG-substituted 4-cresols into the corresponding 4-hydroxybenzaldehydes. Ba...
Positive charges of chitooligomer (COS) enable COS to interact with negatively charged anionic groups on the cell surface resulting in an improvement in the biological activity of COS and its derivatives. In this study, 4-hydroxybenzaldehyde-COS (HB-COS) was synthesized and investigated for its ...
In this study, the solid-liquid equilibrium of 4-hydroxybenzaldehyde in twelve solvents including methanol, ethanol, n-propanol, 1-butanol, isopropanol, ethyl acetate, 2-butanone, acetonitrile, toluene, N,N-dimethylformamide, 1,4-dioxane and acetone were constructed by the isothermal dissolution...
This study was aimed at investigating the influence of ethanol, wine polyphenols and yeast extract on the volatility of 4-ethylphenols in red wines. The use of solid-phase microextraction with short extraction times for the study of the headspace composition, revealed a strong influence of ethan...
4-Ethylphenol (4-EP) and 4-ethylguaiacol (4-EG) are the identified volatile phenolic compounds associated with off-odour in wine. The aim of this work was to investigate the kinetics and thermodynamics of sorption of 4-EG and 4-EP by yeast cell walls, using a synthetic wine. Results showed that ...
The objective of this work is to understand the role of metals on the hydrodeoxygenation (HDO) reaction pathways of three bio-oil model compounds. Ni, Ru and Pd were impregnated on USY zeolite, and the catalysts were characterized to determine metal reduction profile, surface concentration and n...
A voltammetric sensor based on molecularly imprinted high affinity nanoparticles has been developed for the direct, selective, and label-free detection of 4-ethylphenol (4EP). The poorly functionalised template 4EP, was successfully imprinted by the recently developed method of solid-phase synth...
A novel sensor for 4-ethylphenol (4EP) was developed based on molecularly imprinted nanoparticles produced via the solid phase imprinting method. The nanoparticles were immobilised on the surface of a gold electrode previously modified with a self assembled monolayer of lipoic acid coupled to ED...
Cork shows an active role in the sorption of volatile phenols from wine. The sorption properties of 4-ethylphenol and 4-ethylguaiacol phenols in hydro-alcoholic medium placed in contact with suberin extracted from cork were especially investigated. To that purpose, suberin was immersed in model ...
Bicyclic and multi-cyclic hydrocarbons usually have high density over 0.87 g/cm3, which is very popular to synthesize from biomass-derived renewable chemicals, but their cryogenic properties need to be further improved for practical applications. In this work, we synthesized ethyl-substituted bi...
Secondary organic aerosol (SOA) species formed in atmospheric aqueous phases is recently recognized as an important contributor to fine aerosols, which is known to be a prominent human health risk factor internationally. This work, for the first time, systematically investigated aqueous-phase ph...
The interfacial activity, hydrophile—lipophile balance and solubility in the aqueous phase of 2-ethylhexanal oxime were considered and used to discuss the mechanism of copper extraction from chloride solutions. It was demonstrated that complexation can occur both in the bulk of the aqueous phas...
One-step synthesis of 2-ethylhexanal (2EH) from n-butyraldehyde and hydrogen gas has been studied over palladium modified base catalysts at 1 atm and 130–200°C by using a fixed-bed, integral-flow reactor. The catalysts were characterized with various techniques: AA, XRD, BET, FT-IR and TPD of ...
Kinetics of nickel(II) extraction by 2-ethylhexanal oxime (EHO) has been investigated in a homothetic cell (Rushton cell) from ammonium solutions. The kinetic study was carried out with a stirring speed fast enough to eliminate the diffusion limitation. The chemical regime can then be assumed an...
We describe the preparation of isomerically pure 2′-Z-chloromethyl and 2′-Z-bromomethyl anhydropenicillins 2a and 2b, from 6,6-dibromo 2β-(chloromethyl) and 2β-(bromomethyl)-2α-methyl-penam-3α-carboxylic acid through the Wolfe rearrangement of anhydropenicillins.
A general scheme of reactions between chloro(chloromethyl)dimethylstannane and N-trimethylsilylamides and -lactams was established by NMR and IR techniques. The reactions proceed via transmetallation followed by transformation of the N-stannylated intermediate (1) into (N–Sn)-coordinated O-stan...
The reaction of 1-chlorovinyl p-tolyl sulfoxides, which were derived from ketones and chloromethyl p-tolyl sulfoxide, with lithium acetylides gave adducts in moderate to good yields. Treatment of the adducts with Grignard reagents resulted in the formation of magnesium carbenoids by the sulfoxid...
In this chapter the chemistry and structural aspects of seven membered saturated and unsaturated nitrogen, oxygen, and sulfur heterocycle with one or more heteroatoms in the ring are discussed. The ring can contain two or more same or different heteroatoms. Depending on the different position of...
A new potential toxaphene congener 3-endo,5-endo-dichloro-7,7-bis-chloromethyl-4-dichloromethyl-tricyclo[2.2.1.02,6]heptane 2 has been isolated from reaction mixture obtained by the chlorination of 2-exo,10,10-trichlorobornane 1. The X-ray structural analysis of 2 revealed an unusual tricyclic s...
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