- Highly efficient oxidation of 2,2′-hydrazobis-isobutyronitrile to 2,2′-Azobis-isobutyronitrile over a CrO: X/TiO2catalyst with hydrogen peroxide
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Green oxidation of 2,2′-hydrazobis-isobutyronitrile (HAIBN) to 2,2′-Azobis-isobutyronitrile (AIBN) over a recyclable solid catalyst was a significant challenge. A titanium dioxide-supported chromium oxide (CrOx/TiO2) catalyst was, for the first time, developed for oxidation of HAIBN with hydrogen peroxide and achieved complete conversion of HAIBN with a high (94.8%) yield of AIBN.
- Lu, Xionggang,Wang, Xueguang,Yue, Shengnan,Zhang, Hu,Zou, Xingli,Zou, Xiujing
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- PROCESS FOR SYNTHESIZING AZO COMPOUNDS
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A process for synthesizing an azo compound by oxidation of a hydrogen compound in the presence of a catalyst and a compound of formula (I) is described in which R1, R2 and R3 [in-line-formulae](R1)(R2)C(PO3(R3)2)2??(I)[/in-line-formulae] are as defined. The use of a compound of formula (I) as complexing agent for a catalyst is also described.
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Paragraph 0090-0093
(2021/01/26)
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- METHOD FOR PRODUCING AZO COMPOUNDS
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PROBLEM TO BE SOLVED: To provide a method that can produce azo compounds at good yields by making oxygen or an oxygen-containing gas act on hydrazo groups of hydrazo compounds when oxidatively dehydrogenating them. SOLUTION: Azo compounds are produced by making oxygen or an oxygen-containing gas act on hydrazo compounds in the presence of vanadium or cerium compounds, and a solvent. SELECTED DRAWING: None COPYRIGHT: (C)2018,JPOandINPIT
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Paragraph 0059
(2018/05/03)
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- METHOD FOR PRODUCING AZO COMPOUNDS
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PROBLEM TO BE SOLVED: To provide a method that can produce azo compounds at good yields by making oxygen or an oxygen-containing gas act on hydrazo compounds when oxidatively dehydrogenating them. SOLUTION: Azo compounds are produced by making oxygen or an oxygen-containing gas act on hydrazo compounds in the presence of nitrite compounds, bromine compounds and a solvent. SELECTED DRAWING: None COPYRIGHT: (C)2018,JPOandINPIT
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Paragraph 0046
(2018/04/14)
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- METHOD FOR PRODUCING AZO COMPOUNDS
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PROBLEM TO BE SOLVED: To provide a method that can produce azo compounds at good yields by making oxygen or an oxygen-containing gas act on hydrazo compounds when oxidatively dehydrogenating them. SOLUTION: Azo compounds are produced by making oxygen or an oxygen-containing gas act on hydrazo compounds in the presence of at least one compound selected from the group consisting of vanadium and cerium compounds, the oxidation reaction to be performed without using a solvent. SELECTED DRAWING: None COPYRIGHT: (C)2018,JPOandINPIT
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Paragraph 0050
(2018/08/22)
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- Azobisisobutyronitrile preparation method
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The present invention relates to an azobisisobutyronitrile preparation method, which comprises: carrying out a reaction on sodium hypochlorite, ammonia and acetone to prepare an acetone azine synthesis solution; purifying to obtain acetone azine with a mass content of not less than 90%; reacting with hydrogen cyanide to obtain hydrogenated azobisisobutyronitrile; and oxidizing with chlorine gas orhydrogen peroxide to obtain an azobisisobutyronitrile solution. Compared to the conventional process, the method of the present invention can simplify the production process, shorten the production cycle, and reduce the consumption of steam and circulating water so as to increase the yield of azobisisobutyronitrile and reduce the production cost.
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Paragraph 0021
(2019/01/08)
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- METHOD OF SYNTHESIS OF AZO COMPOUNDS
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A process is provided for synthesizing an azo compound, such as AIBN, by oxidation of a hydrazo compound using hydrogen peroxide. This process comprises a step of adding to the reaction medium a particular reducing agent, such as hydrazine.
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Paragraph 0042-0047
(2015/02/18)
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- Metal bridging for directing and accelerating electron transfer as exemplified by harnessing the reactivity of AIBN
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A new strategy for tuning the electron transfer between radicals and enolates has been developed. This method elicits the innate reactivity of AIBN with a copper catalyst and enables a cascade reaction with cinnamic acids. Electron paramagnetic resonance studies and control experiments indicate that the redox-active copper species not only activates the radical by coordination, but also serves as a bridge to bring the radical and nucleophile within close proximity to facilitate electron transfer. By exploiting possible combinations of redox-active metals and radical entities with suitable coordinating functional groups, this strategy should contribute to the development of a broad range of radical-based reactions.
- Xie, Yinjun,Guo, Shengmei,Wu, Longmin,Xia, Chungu,Huang, Hanmin
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p. 5900 - 5904
(2015/05/13)
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- PREPARATION OF AZO COMPOUNDS WITH SOLID CATALYSTS
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The present invention refers to a procedure for preparing azo compounds comprising a reaction between at least: one amine or polyamine, molecular oxygen, a catalyst comprising at least one support selected from at least a metal oxide of one of the elements of the groups 3, 4, 5, 6, 8, 9, 11 and 13, silica, an anionic laminar compound of hydrotalcite type or its derivatives, active carbon or an organic polymer. In addition, said catalyst may contain nanoparticles of gold.
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Page/Page column 8
(2011/06/23)
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- Method for the production of azo compounds
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The invention relates to a method for production of azo compounds. In particular the invention relates to a step-wise method for production of an azo compound, by seeding and oxidation of the corresponding hydrazoic compound.
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Page/Page column 2-3
(2008/06/13)
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- Oxidation of 1,2-bis (cyanoalkyl) hydrazines to azobisnitriles using trichloroisocyanuric acid
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Azobisnitriles were synthesised in excellent yields by oxidation of the corresponding 1, 2-bis (cyanoalkyl) hydrazines using trichloroisocyanuric acid in acetonitrile medium at room temperature.
- Mohite,Desai, Uday V.,Pore,Mane,Wadgaonkar
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p. 645 - 646
(2007/10/03)
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- Oxidation of alkylcyanohydrazines to azo-bis nitriles using Oxone-potassium bromide in aqueous medium
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Azo-bis nitriles were prepared in good yields and high purity by oxidation of corresponding 1,2-bis-dialkylcyano hydrazines using oxone-potassium bromide in aqueous medium.
- Tamhankar,Desai, Uday V.,Mane,Kulkarni,Wadgaonkar
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p. 3643 - 3646
(2007/10/03)
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- Polymers capable of absorbing ultraviolet radiation, their preparation and their use in cosmetic compositions
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An ultraviolet radiation absorbing polymer having units of formula I: STR1 wherein X is a group derived from benzylidene-bornanone of formula II STR2 wherein R1 represents hydrogen or C1 -C12 alkoxy and R2 represents C4 -C12 alkyl. The polymer is useful in protecting human skin against sunburn.
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- CARBON BLACK AS AN ELECTRON-TRANSFER CATALYST - THE TWO-PHASE DEHYDROGENATION OF HYDRAZO NITRILES BY AN AQUEOUS SOLUTION OF POTASSIUM HEXACYANOFERRATE(III), USING CARBON BLACK AS THE CATALYST.
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The two-phase(aqueous and organic phase) dehydrogenation of hydrazo nitriles by an aqueous solution of potassium hexacyanoferrate(III), using carbon black as the catalyst, was carried out at 40 degree C with shaking. In the presence of carbon black, the two-phase dehydrogenation of hydrazo nitriles was accelerated, and the corresponding azo nitriles were obtained in good yields. The catalytic activity of channel blacks was larger than that of furnace blacks. Moreover, the increasing content of phenolic hydroxyl groups tended to increase the catalytic activity of carbon blacks. It became apparent that phenolic hydroxyl groups on the surface of carbon black act as an electron-transfer catalyst in the two-phase dehydrogenation.
- Tsubokawa,Takeda,Sone
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p. 3541 - 3545
(2007/10/02)
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- Process for producing an azonitrile with improved color from an aminonitrile in an aqueous system comprising mixed surface active compounds
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A process for the preparation of 2,2'-azobis(isobutyronitrile) of improved color which comprises reacting 2-amino-2-methylpropionitrile with a metal hypochlorite, M(OCl)x where M is selected from sodium, potassium or calcium and x is the valence of M, in the presence of water and a mixture of a quaternary ammonium surface active compound with either a nonionic or amphoteric surface active compound, said mixture having an HLB of about 8 to about 35 at a temperature of about -10° C to about 30° C and recovering the self-precipitated 2,2'-azobis(isobutyronitrile) from the reaction mixture.
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