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References in periodicals archive ?
In this research, general lumped kinetic model is applied where the intermediate products (catechol, benzoquinone, hydroquinone, etc.) can be expressed as a set of first order ordinary differential equations.
The two carbonyl peaks at 186.8 and 185.2[delta] in [sup.13]C-NMR spectrum validate the benzoquinone moiety.
Only one of the benzoquinone chemicals killed ticks, but it was not as toxic as permethrin, Carroll says.
Para Benzoquinone (Purity 99%, M.wt.108) was obtained from Sigma-Aldrich Chemicals Ltd.
Similarities between the reactions of dioxygen and alkenes with palladium(0): relevance to the use of benzoquinone and molecular oxygen as stoichiometric oxidants in palladium-catalyzed oxidation reactions.
He and his colleagues have recently found that when attacked, some of the beetles release benzoquinone, which smells vile, at least to people.
The name ubiquinone refers to the ubiquitous presence of these compounds in living organisms and their chemical structure, which contains a functional group known as a benzoquinone.
In patients with alkaptonuria, excess homogentisic acid is oxidized and polymerized by polyphenol oxidase into benzoquinone acetic acid, which binds to collagen irreversibly.[4] There is some suggestion that in experimental chick embryo models homogentisic metabolites inhibit lysyl hydroxylase activity, which results in poor collagen cross linking.[5] Collagen may be damaged by pigment deposition.
Frost claims that by producing important intermediates like catechol, adipic acid, hydroquinone, benzoquinone, gallic acid, and pyrogallol - all of which are currently made using cancer-causing benzene - his clean processes can reduce benzene use by 20%.
Materials such as hydroquinone and benzoquinone inhibit or slow down the polymerization reaction rate.
Above 650AdegC, low molecular weight products including carbon monoxide, carbon dioxide, phenols, methyl phenols, dibenzofuran/ derivatives of benzofuran, biphenyls, benzophenone, hydroquinone and benzoquinone may be formed [24,25].