Antioxidant properties of several phenolic compounds in lubricants were investigated by quantum mechanical simulation. The reaction barrier phenol, 2-tert-butylphenol and 2,6-di-tert-butylphenol with the alkoxy free radical generated oxidation, bond dissociation energy O-H them, difference from HOMO to LUMO them calculated. activity phenoxy radicals formed after hydrogen supply was compared. re...

The synthesis of twenty six prenylated phenols derivatives is reported. These compounds were obtained under mild conditions via Electrophilic Aromatic Substitution (EAS) coupling reactions between phenol derivatives containing electron-donor subtituents and 3-methyl-2-buten-1-ol using BF(3)×OEt(2). Dialkylations were also produced with this method. The formation of a chroman ring by intramolecu...

A bacterial strain, Pseudomonas sp. POB 310, was enriched with 4-carboxy biphenyl ether as sole source of carbon and energy. Resting cells of POB 310 co-oxidize a substrate analogue, 4-carboxybenzophenone, yielding 1,2-dihydro-1,2-dihydroxy-4-carboxy-benzophenone. The ether bond of 3- and 4-carboxy biphenyl ether is cleaved analogously by initial 1,2-dioxygenation, yielding a hemiacetal which i...

Phenol is one of the main pollutants that have a serious impact on environment and can even be very critical to human health. The biodegradation phenol considered an increasingly important pollution control process. In this study, degradation by Bacillus simplex was investigated for first time under different growth conditions. Six initial concentrations were used as primary substrate. Culture ...

The catalytic synthesis of hydroquinoneutilize benzene as the starting material. The manufacture of hydroquinone by oxidation of phenol and 1,2diisopropylbenzene. The first route begin with Friedel-Crafts alkylation of petroleum –derived benzene to afford cumene. Subsequent Hock-type, air oxidation of the cumene leads to formation of acetone and phenol. The phenol is oxidized by using 70%hydrog...

An amperometric principle-based biosensor containing immobilized enzyme laccase from Trametes versicolor was developed for detection of ortho-substituted phenolic derivatives. Different immobilization methods for Trametes versicolor laccase enzyme on cellophane membrane and the enhancement of operational stability of the immobilized enzyme electrode using various protein-based stabilizing agent...

Pseudomonas fluorescens was grown on mineral salts media with phenol, p-hydroxybenzoic acid, p-hydroxy-phenylacetic acid, or p-hydroxy-trans-cinnamic acid as sole carbon and energy source. Each compound was first hydroxylated, ortho to the hydroxyl group on the benzene ring, to give catechol, protocatechuic acid (3,4-dihydroxy-benzoic acid), homoprotocatechuic acid (3,4-dihydroxy-phenylacetic a...