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60-34-4Relevant academic research and scientific papers
Observation of CH AX, CN BX, and NH AX emissions in gas-phase collisions of fast O(3P) atoms with hydrazines
Orient, Otto J.,Chutjian, Ara,Murad, Edmond
, p. 8297 - 8301 (1994)
Optical emissions in single-colision reactions of fast (20 eV laboratory translational energy) O(3P) atoms with hydrazine, methylhydrazine, and 1,1-dimethylhydrazine have been measured in a crossed-beams geometry.The emissions were observed in
Electrochemical Reductive N-Methylation with CO2Enabled by a Molecular Catalyst
Rooney, Conor L.,Wu, Yueshen,Tao, Zixu,Wang, Hailiang
supporting information, p. 19983 - 19991 (2021/12/01)
The development of benign methylation reactions utilizing CO2 as a one-carbon building block would enable a more sustainable chemical industry. Electrochemical CO2 reduction has been extensively studied, but its application for reductive methylation reactions remains out of the scope of current electrocatalysis. Here, we report the first electrochemical reductive N-methylation reaction with CO2 and demonstrate its compatibility with amines, hydroxylamines, and hydrazine. Catalyzed by cobalt phthalocyanine molecules supported on carbon nanotubes, the N-methylation reaction proceeds in aqueous media via the chemical condensation of an electrophilic carbon intermediate, proposed to be adsorbed or near-electrode formaldehyde formed from the four-electron reduction of CO2, with nucleophilic nitrogenous reactants and subsequent reduction. By comparing various amines, we discover that the nucleophilicity of the amine reactant is a descriptor for the C-N coupling efficacy. We extend the scope of the reaction to be compatible with cheap and abundant nitro-compounds by developing a cascade reduction process in which CO2 and nitro-compounds are reduced concurrently to yield N-methylamines with high monomethylation selectivity via the overall transfer of 12 electrons and 12 protons.
Improved technology of mono-methyl hydrazine production process
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Sheet 0027-0036, (2020/07/13)
The invention discloses an improved technology of a mono-methyl hydrazine production process. An improved process is invented on the basis of a hydrochloric acid methanol hydrazine hydrate method, andthe defects of many byproducts, low reaction yield, environmental pollution caused by formation of highly toxic polybasic hydrazine in a reaction solution, and the like, when mono-methyl hydrazine issynthesized by using a hydrochloric acid methanol hydrazine hydrate method at present are overcome. According to the method, further methyl diversification of the target product mono-methyl hydrazinegenerated firstly in the reaction process is avoided, single production of the target product is guaranteed, more importantly, the process is simplified and environmentally friendly, the yield is increased, and the cost is reduced.
Preparation technology of methylhydrazine
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Paragraph 0025-0032, (2019/04/04)
The invention discloses a preparation technology of methylhydrazine, and belongs to the technical field of organic synthesis. The preparation technology comprises the following steps: (1) adding hydrazine monohydrochloride and methanol into a reaction kettle, then adding water and a catalyst, and then rising the temperature for carrying out methylation, thus obtaining methylhydrazine hydrochloride; (2) directly cooling feed liquid after reaction, separating a solid catalyst from unreacted hydrazine hydrochloride, and carrying out dealcoholizing, dissociating, rectifying and the like on filtrate, thus obtaining the methylhydrazine. The preparation technology disclosed by the invention has the advantages that the reaction selectivity is good, the reaction pressure is low, the catalyst can becompletely and mechanically used, and safety, cleanliness, environment protection and the like are realized.
Tris(2-carboxyethyl)phosphine promotes hydrolysis of iminoboronates
Liu, Xiaoyu,Li, Zhihong,Xu, Hongtao,Zhan, Yuexiong,Ma, Peixiang,Chen, Hongli,Jiang, Biao
, p. 3101 - 3106 (2017/07/18)
Iminoboronates are stable and formed fast. Their B[sbnd]N bonds could be reverted by some endogenous biological molecules. The reversible characteristic attracts significant attention in biological and chemical fields. Although synthesis of iminoboronates is well-studied, less efforts have been devoted to disconnecting the units. Here, a series of selected compounds were screened to evaluate their hydrolytic capability of iminoboronates by 1H NMR or 11B NMR detection. Tris(2-carboxyethyl)phosphine (TCEP), was emerged as an excellent reagent, which decomposed most iminoboronates in short time with high yields. In addition, TCEP is also able to hydrolyze hydrazones and oximes with moderate yields.
Preparation method of methylhydrazine
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Paragraph 0017, (2017/08/04)
The invention discloses a method for one-step preparation of methylhydrazine. The method comprises that under the protection of inert gas, hydrazine hydrate and methanol are subjected to alkylation reaction under an action of a catalyst for one-step synthesis of methylhydrazine, excess methanol is kept in the reaction process, and a mixed solution after the reaction is finished is rectified to obtain a high-purity methylhydrazine solution. The method has the following advantages of short process route, simple operation, high reaction yield, high selectivity of the catalyst, mild reaction conditions, and fewer by-products and side reactions; the catalyst and unreacted methanol and hydrazine can be recycled for use in the alkylation reaction, no solvents are used, no three wastes are generated, and the method is green and environmentally friendly.
Provided is a new method of catalytic synthesis of methyl hydrazine
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Paragraph 0040-0049, (2017/08/25)
The invention discloses a novel method of catalytic synthesis of methylhydrazine under normal pressure. The method is characterized in that hydrazine hydrate and methane chloride react under normal pressure and 70-74 DEG C by taking hydrochloric acid as a protective agent, silica gel as a catalyst and ethyl alcohol as a solvent, thus generating methylhydrazine hydrochloride. A hydrazine ionization method is adopted, after methylhydrazine is ionized by the hydrazine hydrate, and a methylhydrazine aqueous solution is obtained by a rectification process. The ionized side product hydrazine monohydrochloride can be repeatedly used. The method has the following advantages: equipment cost and raw material price are lower in cost, reaction yield is high, the selectivity is good, three wastes are not generated, environment friendliness is good, and the process realizes internal circulation, continuous production can be conveniently performed, moreover, reaction is performed under normal pressure, operation is simple and production is safe.
By using industrial waste 1, 2 - dimethyl jing into a method of monomethyl hydrazine
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Paragraph 0020-0022, (2017/10/26)
The invention discloses a novel method for converting industrial waste 1,2-dimethylhydrazine into methylhydrazine. A by-product 1,2-dimethylhydrazine liquid waste in industrial production of methylhydrazine is directly oxidized by using an oxidant for the first time, and a high-purity methylhydrazine water solution is obtained in rectifying and concentrating manners, so that commercial use of the 1,2-dimethylhydrazine by-product is solved. The method is simple in reaction process, high in conversion rate, and low in cost, the fed oxidant can be recycled after being restored, above all, waste is changed into treasures, the environmental pollution caused by discharged highly toxic industrial waste is prevented, and the safety is improved.
Electrochemical reduction of 3-methyl-1-phenyl-3-hydroxytriazene and its copper complex
Gupta, Manu,Hemlata,Karnawat, Romila,Verma
, p. 1525 - 1530 (2013/02/23)
3-Methyl-1-phenyl-3-hydroxytriazene (MPHT) and its Cu complex were synthesized, purified and characterized by spectral techniques. The electrochemical reduction of MPHT was studied in aqueous methanolic solution containing BR buffer using DC-polarography and cyclic voltammetry. The DC-polarogram and cyclic voltammograms displayed only one reduction wave. The kinetic parameters have been evaluated. The cyclic voltammetric data reveals that the reduction is irreversible and follows an EC mechanism involving transfer of six electrons. Constant current electrolysis of MPHT was carried out using stainless steel electrode. The products of electro-reduction were isolated, purified and then characterized by spectroscopic methods. The proposed mechanism is given for electro-reduction of MPHT in acidic, aqueous and alkaline medium. The voltammetric studies of Cu complex of MPHT at Pt electrode in CH2CI2 shows one electron quasi-reversible electrode process.
PROCESS FOR PREPARING MONOMETHYLHYDRAZINE
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Page/Page column 4, (2009/07/25)
The present invention relates to a process for preparing monomethylhydrazine by methylating hydrazine or hydrazinium hydrochloride or hydrazinium dihydrochloride with methyl chloride and/or a methano/HCl mixture, characterized in that the reaction mixture formed in the methylation is reacted with an organic base from the group of the alkylamines or alkanolamines and monomethylhydrazine is removed by distillation from the reaction mixture in a low boiler fraction and the low boiler fraction is optionally subjected to a further distillation.