105-12-4Relevant articles and documents
Preparation method for synthesizing p-dinitrosobenzene by wet material
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, (2022/03/27)
The present application discloses a method for synthesizing p-nitrosobenzene by wet material, comprising: adding phenol to an aqueous solution of sodium nitrite and sodium hydroxide, formulated into a mixed solution of sodium phenol and sodium nitrite, at a predetermined temperature, the mixed solution is added dropwise to the sulfuric acid solution, stirring reaction, filtering, washing to obtain an intermediate p-nitrosophenol wet material; The p-benzoquinone dioxime wet material was dissolved in an aqueous solution of sodium hydroxide to obtain an alkaline p-benzoquinone dioxime solution, and the NaClO dilute solution was added dropwise to the alkaline p-benzoquinone dioxime solution, stirred the reaction, filtered and washed to obtain a p-nitrosobenzene product. The raw material cost of this method is low, the whole process involves only water as a reaction solvent, the operation process is simple, the process wet intermediates do not need to be dried, and the final p-dinitrosobenzene has excellent adhesive adhesion performance.
NEW TELESCOPING SYNTHESES OF 2-METHOXYMETHYL-P-PHENYLENEDIAMINE
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Page/Page column 30-31, (2021/02/19)
The invention relates to processes for preparing 2 -methoxymethyl-p-phenylenediamine (I), cosmetically acceptable salts thereof, or mixtures thereof.
Selective N-oxidation of aromatic amines to nitroso derivatives using a molybdenum acetylide oxo-peroxo complex as catalyst
Biradar, Ankush V.,Kotbagi, Trupti V.,Dongare, Mohan K.,Umbarkar, Shubhangi B.
, p. 3616 - 3619 (2008/09/19)
The molybdenum acetylide oxo-peroxo complex obtained in situ by the treatment of the corresponding molybdenum acetylide carbonyl complex, CpMo(CO)3(C{triple bond, long}CPh); Cp = η5-C5H5 with H2O2, has been used as an efficient catalyst for selective N-oxidation of primary amines to nitroso derivatives. Excellent amine conversion (up to 100%) and very high selectivity for nitroso compounds (99%) have been obtained using 30% hydrogen peroxide as an oxidant. The oxo peroxo Mo(VI) complex has also been found to be very active for the oxidation of various substituted primary aromatic amines with electron donating as well as electron withdrawing substituents on the aromatic ring.
Catalytic Autoxidation of Benzoquinone Dioximes with Nitrogen Oxides: Steric Effects on the Preparation of Monomeric Dinitrosobenzenes
Rathore, R.,Kim, J. S.,Kochi, J. K.
, p. 2675 - 2684 (2007/10/02)
A convenient catalytic method for the autoxidation of quinone dioximes to dinitrosobenzenes with dioxygen is based on the presence of small amounts of nitrogen oxides.The catalytic cycle is deduced from the facile chemical oxidation of quinone dioxime to dinitrobenzene with stoichiometric amounts of the 1-electron oxidant, nitrosonium-either as the NO+BF4- salt or the disproportionated ion pair NO+NO3- derived from nitrogen dioxide.The regeneration of NO+ occurs by the subsequent oxidation of nitric oxide (NO) with dioxygen to nitrogen dioxide followed by the disproportionation to nitrosonium nitrate in the presence of electron-rich donors.Indeed, dioximes of various p-benzoquinones are shown to be strong reducing agents by transient electrochemistry.Electrochemical oxidation also leads to dinitrosobenzenes in good yields at anodic potentials of ca. 1.3 V.The substitution of p-dinitrosobenzene with bulky alkyl groups stabilizes the monomeric form, which is otherwise extensively associated.
KINETICS AND MECHANISM OF THE THERMAL DISSOCIATION OF O,O'-BIS(1,3,5-TRI-tert-BUTYL-4-OXO-2,5-CYCLOHEXADIENYL)-p-BENZOQUINONE DIOXIME IN SOLUTION
Khizhnyi, V. A.,Danilova, T. A.,Goloverda, G. Z.,Dobronravova, Z. A.
, p. 776 - 781 (2007/10/02)
The kinetics and mechanism of the thermal dissociation of O,O'-bis(1,3,5-tri-tert-butyl-4-oxo-2,5-cyclohexadienyl)-p-benzoquinone dioxime (quinol ether) in solutions in nonpolar solvents were investigated.The dissociation of the quinol ether is a reversible two-stage process and involves the formation of an intermediate radical.In relation to the reaction conditions (initial concentration, temperature) the dissociation rate of the quinol ether obeys the kinetic equations ω = keff.c1/2 or ω = k1c.The change in the reaction order is due to the ratio of the rates of dissociation of the intermediate radical and of its reaction with the phenoxyl radical.
