132-86-5Relevant articles and documents
Efficient dihydroxylation of naphthalene on photoirradiated rutile TiO2 powder in solution containing hydrogen peroxide
Jia, Jianguang,Ohno, Teruhisa,Matsumura, Michio
, p. 908 - 909 (2000)
We report on enhanced dihydroxylation of naphthalene on photoirradiated TiO2 particles by addition of H2O2 to the reaction solution. The rate was enhanced by 6-40 times by the addition of H2O2, and th
Dihydroxylation of naphthalene by molecular oxygen and water using TiO2 photocatalysts
Jia, Jianguang,Ohno, Teruhisa,Masaki, Yuji,Matsumura, Michio
, p. 963 - 964 (1999)
TiO2-catalyzed photo-reaction of naphthalene was investigated in mixed solutions of acetonitrile and water. The main products were confirmed to be 1,8- and 1,3-dihydroxynaphthalene, without any 1-or 2-naphthol being detected. Both O2
Role of substituents on the reactivity and product selectivity in reactions of naphthalene derivatives catalyzed by the orphan thermostable cytochrome P450, CYP175A1
Banerjee, Shibdas,Goyal, Sandeep,Mazumdar, Shyamalava
, p. 94 - 105 (2015)
The thermostable nature of CYP175A1 enzyme is of potential interest for the biocatalysis at ambient temperature or at elevated temperature under environmentally benign conditions. Although little is known about the substrate selectivity of this enzyme, the biocatalytic activities of CYP175A1 on different substituted naphthalenes have been studied in oxidative pathway, and the effect of the substituent on the reaction has been determined. The enzyme first acts as a peroxygenase to convert these substituted naphthalenes to the corresponding naphthols, which subsequently undergo in-situ oxidative dimerization to form dyes of different colors possibly by the peroxidase-type activity of CYP175A1. The product analyses and kinetic measurements suggested that the presence of electron releasing substituent (ERS) in the substrate enhanced the substrate conversion, whereas the presence of electron withdrawing substituent (EWS) in the substrate drastically reduced the substrate conversion. The position of the ERS in the substrate was also found to play an important role in the transformation of the substrate. The results further demonstrate that mutation of the Leu80 residue to Phe enhances the reactivity of the enzyme by favoring the substrate association in the active site. The observed rates of the enzymatic oxygenation reaction of the substituted naphthalenes followed the Hammett correlation of substituent effect, supporting aromatic electrophilic substitution mechanism catalyzed by the cytochrome P450 enzyme.
α/β-SELECTIVITY IN HYDROLYSES OF α- OR β-NAPHTHYL ACETATES IN THE PRESENCE OF CYCLOAMYLOSES
Fujita, Kahee,Ejima, Seiji,Imoto, Taiji
, p. 3587 - 3590 (2007/10/02)
Cyclohexaamylose hydrolyzed α-naphthyl acetates more rapidly than the corresponding β-isomers, a phenomenon termed "α-selectivity", while cyclopentaamylose showed 'β-selectivity' and the selectivity of cycloheptaamylose fell between those of cyclohexa- and cycloocta-amyloses.
Method for preparing adduct of butadiene polymer or copolymer and α, β-ethylenically unsaturated dicarboxylic acid compound
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, (2008/06/13)
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.
