- Transformations of myo-inositol hexa-0-nitrate under the action of amines
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Reactions of myo-inositiol hexa-0-nitrate with ammonia and primary amines yield tetrahydroxy-1,4-benzoquinone derivatives, viz., its tetraammonium salt and its diimines, respectively. Reactions with secondary and tertiary amines give salts of rhodizonic acid, which are converted into salts of croconic acid under certain conditions. The reactions with secondary amines involve intermediate formation of radical species, which were dectected by ESR spectroscopy. A scheme for the chemical transformations of myo-inositol hexa-0-nitrate under the action of amines was proposed.
- Kuznetsov,Sukhov,Pichugin,Ershov
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- Method for dyeing keratinous fibres using a monohydroxyindole or dihydroxyindole and a non-oxidizing aromatic carbonyl derivative and dyeing agent
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The present invention relates to a method for dyeing keratinous fibers, characterized in that the following are applied to the fibers: a) a composition (A) containing, in a medium appropriate for dyeing, at least one monohydroxyindole or dihydroxyindole, this application being preceded or followed by the application of b) a composition (B) containing, in a medium appropriate for dyeing, at least one aromatic carbonyl derivative chosen from hydroxyacetophenones, hydroxybenzophenones, 2-hydroxy-1,4-benzoquinones, hydroxy-1,4-naphthoquinones,amino-1,4-naphthoquinones,hydroxy-9,10-anthraquinones and amino-9,10-anthraquinones. It also relates to the dyeing agents for carrying it out.
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- The photochemistry of the rhodizonate dianion in aqueous solution
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The photochemistry of the rhodizonate dianion at 483 nm has been studied in aqueous solution at pH 8.3.In the absence of oxygen no reaction was observed.In the presence of oxygen, 6.2 x 10-5 M, the dianion was consumed with a quantum yield of 0.044.The oxidation apparently did not involve the formation of O2(1Δg).Electron transfer from the excited dianion was observed with methyl viologen.
- Iraci, G.,Back, M. H.
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p. 1293 - 1294
(2007/10/02)
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- REDUCTION OF METHYL BENZOYLFORMATE BY REDUCED NICOTINAMIDE ADENINE DINUCLEOTIDE MODEL IN THE PRESENCE OF RHODIZONIC ACID
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The reduction of rhodizonic acid (RA) with 1-benzyl-1,4-dihydronicotinamide (BNAH; NADH model) was carried out at room temperature to obtain tetrahydroxy-p-quinone (THQ) and hexahydroxybenzene (HHB) by two-electron and four-electron reductions, respectively.The reduction of methyl benzoylformate with BNAH proceded smoothly in the presence of RA, although it could not be reduced at all without RA.
- Endo, Takeshi,Takada, Tadayoshi,Okawara, Makoto
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p. 615 - 618
(2007/10/02)
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