- Reduction of organic azides to amines using reusable Fe3O 4 nanoparticles in aqueous medium
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Aromatic, heteroaromatic and sulfonyl azides were conveniently reduced to the corresponding amines in excellent yields using hydrazine hydrate in the presence of iron oxide nanoparticles. The Fe3O4-MNPs could be easily separated by an external magnet, and recycled ten times without significant loss of the catalytic efficiency. The Royal Society of Chemistry 2013.
- Pagoti, Sreenivasarao,Surana, Subham,Chauhan, Ajay,Parasar, Bibudha,Dash, Jyotirmayee
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p. 584 - 588
(2013/03/28)
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- Process for producing 1,5-diaminonaphthalene
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The present invention relates to a process for producing 1,5-diaminonaphthalene without formation of 1,8-diaminonaphthalene and not through an unstable nitro imine and nitro enamine as intermediates, the process including the steps of dehydrogenating 5-substituted-1-tetralone to produce a naphthol compound and then aminating the hydroxyl group of the naphthol compound.
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- Azo dyes derived from 3-amino pyridine in hair dye compositions
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A composition for dyeing hair comprises in a cosmetic vehicle at least one dye compound of the formula STR1 wherein B is selected from the group consisting of STR2 and STR3 wherein R is lower alkyl containing 1-4 carbon atoms, R1 is selected from the group consisting of hydrogen, lower alkyl containing 1-4 carbon atoms, lower alkoxy containing 1-4 carbon atoms and chlorine, R2 is selected from the group consisting of hydrogen, methyl and methoxy, R4 is selected from the group consisting of hydrogen, methyl, chlorine, nitro, amino and acetylamino, R3 is hydrogen or together with R4 forms an unsaturated 6 membered ring carrying a hydroxy substituent chelated with one of the nitrogen atoms of the azo link, and STR4 where R5 is selected from the group consisting of hydrogen, -CH3, -C2 H5 and β-hydroxyethyl, and R6 is selected from the group consisting of hydrogen, --CH3, --C2 H5, β-hydroxyethyl, phenyl and -CH2 SO3 Na, With the proviso that when B is STR5 the anion X- associated with the quaternized nitrogen atom is the anion residue of a member selected from the group consisting of organic acid and mineral acid, said composition having a pH ranging from 3 to 11 and said compound being present in an amount ranging from 0.001 to 1 percent by weight of said composition.
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- Method for preparing adduct of butadiene polymer or copolymer and α, β-ethylenically unsaturated dicarboxylic acid compound
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In a method for preparing an adduct of (A) a butadiene lower polymer or butadiene lower copolymer and (B) a α,β-ethylenically unsaturated dicarboxylic acid compound, said method is characterized in that said (A) and (B) are caused to react in the presence of one or more compounds selected from (C) p-phenylenediamine derivatives, catechol derivatives, pyrogallol derivatives, N-nitrosamines, quinoline derivatives and naphthol derivatives, thus serious increase of the viscosity of said adduct in the addition reaction can be prevented.
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