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824-78-2Relevant articles and documents
Two picolinamide-based Zn(II) coordination polymers: Syntheses, structures, and catalytic activities
Li, Linke,Yao, Hongchang,Zhao, Jingjing,Yang, Zhihui,Hou, Hongwei
, p. 46 - 52 (2012)
Two picolinamide-based zinc(II) coordination polymers {[Zn(SO 4)(3-bpit) (CH3OH)2]·2CH 3OH}n (1)(3-bpit = N,N'-bis(3-pyridylformyl)imidazolidine- 2-thione) and [Zn(SCN)2(4-bpit)]n(2) (4-bpit = N,N'-bis(4-pyridylformyl)imidazolidine -2-thione) have been synthesized and structurally characterized. In complexes 1 and 2, the picolinamide-based ligands, 3-bpit and 4-bpit, function as bridging bidentate mode, leading to polymeric structures. Complex 1 is a two-dimensional coordination polymer while 2 exhibits a one-dimensional chain structure. The hydrolysis of 4-nitrophenyl acetate catalyzed by complexes 1 and 2 under mild conditions was also investigated.
In situ generation of a high-performance Pd-polypyrrole composite with multi-functional catalytic properties
Choudhary, Meenakshi,Islam, Rafique Ul,Witcomb, Michael J.,Mallick, Kaushik
, p. 6396 - 6405 (2014)
We report on a bottom up approach for the synthesis of a Pd-polypyrrole nanocomposite material. The composite material was characterized by means of different techniques, such as UV-vis, IR, and Raman spectroscopy, which offered information about the chemical structure of the polymer, whereas electron microscopy images provided information regarding the morphology of the composite material and the distribution of the metal particles in the polymer matrix. During the synthesis of the nanocomposite, the Pd nanoparticles act as a catalyst for a model proton-coupled electron transfer reaction. The Pd-polypyrrole nanocomposite material was also used as a catalyst for the electro-catalytic detection of tryptophan, a precursor for some neurotransmitters. This journal is the Partner Organisations 2014.
The α-Deuterium Secondary Kinetic Isotope Effect upon the Hydrolysis of 2-(p-Nitrophenoxy)tetrahydropyran and its Relationship to Values for the Solvolysis of Secondary Alkyl Arenesulfonates and the Enzyme-catalysed Hydrolysis of Acetals
Lee, Won Heui,Maskill, H.,Manneer, Iain D.
, p. 503 - 504 (1993)
The α-deuterium secondary kinetic isotope effect for the uncatalysed hydrolysis of 2-(p-nitrophenoxy)tetrahydropyran is 1.17 in water (46 deg C), a result which is very similar to values for the solvolysi of simple secondary alkyl arenesulfonates which proceed with rate-limiting ionization and appreciably higher than results for enzyme-catalysed hydrolysis of other acetals.
Reactivity differences of O-aryl O-(4-nitrophenyl) thionocarbonates versus their homolog carbonates: Micellar catalysis in hydrolysis reactions
Santos, José G.,Aliaga, Margarita E.,Márquez, Mariana F.,Oyarzún, Mauricio
, (2018)
The alkaline hydrolysis reaction of O-(4-cyanophenyl), O-(4-methylphenyl), and phenyl O-(4-nitrophenyl) thionocarbonates (1, 2, and 3, respectively) and O-(4-cyanophenyl) and phenyl O-(4-nitrophenyl) carbonates (4 and 5, respectively) has been spectrophotometrically studied in aqueous borate buffer media, in the presence of the cationic surfactant CTAB. The pseudophase model successfully explained the results obtained, in the presence of this cationic micelle, and various kinetic parameters were determined. Results show that the catalytic efficiency increases in carbonates and thionocarbonates. In fact, a catalytic efficiency ( kobsmax/k'w) of 485-fold was found in the hydrolysis reaction of thionocarbonate 1, while in the carbonate homolog 4, the effect was of 146-fold. In addition, we found that at the same experimental conditions (Borate buffer pH = 9.0 and 25°C), an increase in the concentration of the buffer led to a decrease of the hydrolysis rate.
Polyphenol-grafted collagen fiber as reductant and stabilizer for one-step synthesis of size-controlled gold nanoparticles and their catalytic application to 4-nitrophenol reduction
Wu, Hao,Huang, Xin,Gao, Mingming,Liao, Xuepin,Shi, Bi
, p. 651 - 658 (2011)
A facile method for one-step synthesis of size-controlled gold nanoparticles (AuNPs) supported on collagen fiber (CF) at room temperature was proposed. Epigallocatechin-3-gallate (EGCG), a typical plant polyphenol, was grafted onto CF surface to serve as reducing/stabilizing agent, so that the AuNPs were generated on CF surface without introduction of extra chemical reagents or physical treatments. The prepared AuNPs were fully characterized, and the results showed that the dispersed AuNPs were successfully produced and the mean particle size of AuNPs could be effectively controlled in range of 18 to 5 nm simply by varying the grafting degree of EGCG on CF surface. These stabilized AuNPs were found to be active heterogeneous catalysts for the reduction of 4-nitrophenol to 4-aminophenol in aqueous phase. The catalytic behaviors of AuNPs depended on the particle size and the grafting degree of EGCG. A distinct advantage of these catalysts is that they can be easily recovered and reused at least twenty times, because of the high stability of the AuNPs supported by EGCG-grafted CF. The Royal Society of Chemistry.
Synthesis process of sodium p-nitrophenolate
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Paragraph 0046-0066, (2021/08/06)
The invention discloses a synthesis process of sodium p-nitrophenolate, and belongs to the technical field of fine chemical product synthesis. The synthesis process comprises the following steps of: 1, introducing nitrogen into a reaction kettle, then preheating the reaction kettle to 160-165 DEG C, controlling the pressure to be 0.75-0.8 MPa, adding a quaternary ammonium salt surfactant into p-nitrochlorobenzene, and preheating p-nitrochlorobenzene and a sodium hydroxide solution to 150-155 DEG C; 2, feeding: during feeding, controlling the flow of p-nitrochlorobenzene to be 600-640g/h and the flow of the sodium hydroxide solution to be 5100-5200g/h; and 3, cooling and crystallizing the obtained reaction liquid to obtain sodium p-nitrophenolate. According to the invention, the quaternary ammonium salt surfactant is added in the synthesis of sodium p-nitrophenolate, so that the reaction is milder, the occurrence of side reaction caused by black material formation due to too fast local reaction is prevented to a certain extent, and the yield and the purity are further improved.
Preparation method of sodium p-nitrophenolate
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Paragraph 0020-0026, (2020/04/22)
The invention discloses a preparation method of sodium p-nitrophenolate. The preparation method comprises the following steps: a) heating and melting p-chloronitrobenzene in a melting kettle, and preparing a sodium hydroxide solution in a dissolving kettle; b) repeatedly introducing nitrogen into a system 3-6 times to replace air before a reaction, pumping the heated and molten p-chloronitrobenzene and the sodium hydroxide solution into a micro-reactor by using a feeding valve, uniformly mixing, and carrying out a high-temperature and high-pressure reaction; and c) transferring the solution after the reaction to a cooling crystallization kettle, and cooling to separate out a sodium p-nitrophenolate solid containing crystal water. According to the invention, a hydrolysis reaction is carriedout by adopting a micro-channel, so that the instant uniform mixing and the efficient heat transfer of the raw materials are realized while the equivalence ratio of the materials in the reaction process is reduced, the generation of side reactions and the difficulty in post-treatment are reduced, water can be recycled so as to reduce the energy consumption in production, improve the utilization rate of the raw materials and achieve the environment-friendly production process, the production cost is low, and the reaction time is greatly shortened; and the color of the prepared sodium p-nitrophenolate is faint yellow or orange yellow, and by-products are few.