Category: 7789-45-9

《A tripodal heptadentate Schiff base as an active ligand for atom transfer radical polymerization》 was written by Xu, Xiaoling; Bao, Chunyang; Hong, Mei; Li, Die; Zhang, Qiang. Reference of Cupric bromideThis research focused ontrispyridylmethyl iminoethylamine Schiff base catalyst methyl methacrylate polymerization. The article conveys some information:

The use of a tripodal heptadentate Schiff base, tris[N-(2-pyridylmethyl)-2-iminoethyl]amine (Py3Tren), as an active ligand for atom transfer radical polymerization (ATRP) is reported. The coordination between Py3Tren and CuBr2 in solution is investigated by electrospray ionization mass spectrometry, which reveals the generation of a tripod claw-shaped complex by using equimolar quantities of CuBr2 and Py3Tren. Electrochem. studies of CuBr2/Py3Tren complexes demonstrate more neg. redox potentials and higher activities compared with those of bidentate CuBr2/N-ethyl-2-pyridylmethanimine (PyEthyl) complexes. Subsequently, CuBr/Py3Tren is employed as a catalyst for the normal ATRP of Me methacrylate (MMA). Well-defined poly(MMA) with controlled mol. weight and narrow polydispersity could be synthesized with high conversions and fast rates even at ambient temperature (30°C). Activators regenerated by electron transfer (ARGET) ATRP and supplemental activators and reducing agents (SARA) ATRP of acrylate monomers using Py3Tren as the ligand are also performed to reduce the amounts of metal catalysts for polymerizations The results came from multiple reactions, including the reaction of Cupric bromide(cas: 7789-45-9Reference of Cupric bromide)

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.Reference of Cupric bromide

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Quality Control of Cupric bromideIn 2019 ,《Translating Surface-Initiated Atom Transfer Radical Polymerization into Technology: The Mechanism of Cu0-Mediated SI-ATRP under Environmental Conditions》 was published in ACS Macro Letters. The article was written by Yan, Wenqing; Fantin, Marco; Spencer, Nicholas D.; Matyjaszewski, Krzysztof; Benetti, Edmondo M.. The article contains the following contents:

The exceptional features of Cu0-mediated surface-initiated atom transfer radical polymerization (Cu0 SI-ATRP), and its potential for implementation in technol. relevant surface functionalizations are demonstrated thanks to a comprehensive understanding of its mechanism. Cu0 SI-ATRP enables the synthesis of multifunctional polymer brushes with a remarkable degree of control, over extremely large areas and without the need for inert atm. or deoxygenation of monomer solutions When a polymerization mixture is placed between a flat copper plate and an ATRP-initiator-functionalized substrate, the vertical distance between these two overlaying surfaces determines the tolerance of the grafting process toward the oxygen, while the composition of the polymerization solution emerges as the critical parameter regulating polymer-grafting kinetics. At very small distances between the copper plate and the initiating surfaces, the oxygen dissolved in the solution is rapidly consumed via oxidation of the metallic substrate. In the presence of ligand, copper species diffuse to the surface-immobilized initiators and trigger a rapid growth of polymer brushes. Concurrently, the presence and concentration of added CuII regulates the generation of CuI-based activators through comproportionation with Cu0. Hence, under oxygen-tolerant conditions, the extent of comproportionation, together with the solvent-dependent rate constant of activation (kact) of ATRP are the main determinants of the growth rate of polymer brushes. The results came from multiple reactions, including the reaction of Cupric bromide(cas: 7789-45-9Quality Control of Cupric bromide)

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.Quality Control of Cupric bromide

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Related Products of 7789-45-9In 2021 ,《A Schiff base ligand for photoinduced atom transfer radical polymerization》 was published in Polymer Chemistry. The article was written by Xu, Xiaoling; Hong, Mei; Bao, Chunyang; Wang, Yan; Chen, Jing; Li, Die; Wang, Tianheng; Zhang, Qiang. The article contains the following contents:

A claw-type Schiff base, tris[N-(2-pyridylmethyl)-2-iminoethyl]amine (Py3Tren), is used as an active ligand for photoinduced atom transfer radical polymerization (Photo-ATRP). CuBr2/Py3Tren was employed as a catalyst for Photo-ATRP of Me methacrylate (MMA) under the irradiation of UV or visible light. Well-defined poly(MMA) could be synthesized with high chain-end functionality confirmed by in situ chain extension. Temporal control of Photo-ATRP was successfully demonstrated by switching the light on and off. The polymerization mechanism was finally discussed through UV/vis spectroscopy and electrospray ionization mass spectrometry experimentsCupric bromide(cas: 7789-45-9Related Products of 7789-45-9) was used in this study.

Cupric bromide(cas: 7789-45-9) can be used as reducing agent, when complexed by three molecules of pyridine initiators for the controlled polymerization of styrene, methyl acrylate and methyl methacrylate.Related Products of 7789-45-9

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

In 2019,ACS Macro Letters included an article by Wang, Zongyu; Yan, Jiajun; Liu, Tong; Wei, Qiangbing; Li, Sipei; Olszewski, Mateusz; Wu, Jianing; Sobieski, Julian; Fantin, Marco; Bockstaller, Michael R.; Matyjaszewski, Krzysztof. Recommanded Product: Cupric bromide. The article was titled 《Control of Dispersity and Grafting Density of Particle Brushes by Variation of ATRP Catalyst Concentration》. The information in the text is summarized as follows:

Silica particles with grafted poly(Me methacrylate) brushes, SiO2-g-PMMA, were prepared via activator regeneration by electron transfer (ARGET) atom transfer radical polymerization (ATRP). The grafting d. and dispersity of the polymer brushes was tuned by the initial ATRP catalyst concentration ([CuII/L]0). Sparsely grafted particle brushes, which also displayed an anisotropic string-like structure in TEM images, were obtained at very low catalyst concentrations, [CuII/L]0 < 1 ppm. The effect of the initial catalyst concentration on dispersity and initiation efficiency in the particle brush system was similar to that observed in the synthesis of linear PMMA homopolymers. The kinetic study revealed a transition from controlled radical polymerization to a less controlled process at low monomer conversion, when the [CuII/L]0 decreased below about 10 ppm. In the experimental materials used by the author, we found Cupric bromide(cas: 7789-45-9Recommanded Product: Cupric bromide)

Cupric bromide(cas: 7789-45-9) can be used as reducing agent, when complexed by three molecules of pyridine initiators for the controlled polymerization of styrene, methyl acrylate and methyl methacrylate.Recommanded Product: Cupric bromide

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Electric Literature of Br2CuIn 2019 ,《Influence of molecular weight on PNIPAM brush modified colloidal silica particles》 appeared in Soft Matter. The author of the article were Humphreys, Ben A.; Prescott, Stuart W.; Murdoch, Timothy J.; Nelson, Andrew; Gilbert, Elliot P.; Webber, Grant B.; Wanless, Erica J.. The article conveys some information:

The effect of mol. weight and temperature on the phase transition and internal structure of poly(N-isopropylacrylamide) brush modified colloidal silica particles was investigated using dynamic light scattering (DLS) and small angle neutron scattering (SANS) between 15 and 45°C. Dry particle anal. utilizing transmission electron microscopy (TEM), Fourier-transform IR spectroscopy (FTIR) and thermogravimetric anal. (TGA) all confirmed the thickness of the polymer brush shell increased as a function of polymerization time. Hydrodynamic diameter and electrophoretic mobility results revealed that the brush modified particles transitioned from swollen shells to a collapsed conformation between 15 and 35°C. The dispersions were electrosterically stabilized over the entire temperature range investigated, with minimal thermal hysteresis recorded. Modeling of the hydrodynamic diameter enabled the calculation of a lower critical solution temperature (LCST) which increased as a function of brush thickness. The internal structure determined via SANS showed a swollen brush at low temperatures (18 and 25°C) which decayed radially away from the substrate, while a collapsed block-like conformation with 60% polymer volume fraction was present at 40°C. Radial phase separation was evident at intermediate temperatures (30 and 32.5°C) with the lower mol. weight sample having a greater volume fraction of polymer in the dense inner region at these temperatures In addition to this study using Cupric bromide, there are many other studies that have used Cupric bromide(cas: 7789-45-9Electric Literature of Br2Cu) was used in this study.

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.Electric Literature of Br2Cu

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

《Tunable Assembly of Block Copolymer Tethered Particle Brushes by Surface-Initiated Atom Transfer Radical Polymerization》 was written by Wang, Zongyu; Lee, Jaejun; Wang, Zhenhua; Zhao, Yuqi; Yan, Jiajun; Lin, Yu; Li, Sipei; Liu, Tong; Olszewski, Mateusz; Pietrasik, Joanna; Bockstaller, Michael R.; Matyjaszewski, Krzysztof. Application In Synthesis of Cupric bromideThis research focused ontunable assembly block polystyrene polymethacrylate silica brush ATRP. The article conveys some information:

A strategy to synthesize SiO2-g-PMMA/PMMA-b-PS mono- and bimodal block copolymer particle brushes by surface-initiated atom transfer radical polymerization (SI-ATRP) from silica particles is presented. First, PMMA blocks were prepared by normal ATRP with controlled degree of polymerizations and grafting d. In a second step, the PS block was synthesized through a chain extension using low ppm of Cu catalyst. Variation of the SiO2-g-PMMA-Br macroinitiator concentration had a pronounced effect on the modality of the chain extension product. In the limit of small concentration, partial termination resulted in bimodal brush architectures, while more uniform brush architectures were observed with increasing concentration of macroinitiator. Brush nanoparticles with bimodal architectures assembled into string-like aggregates that bore a resemblance to structures found in systems comprised of sparse (homopolymer) brush particles. The unexpected effect of modality on structure formation points to opportunities in controlling microstructures in brush particle materials. The results came from multiple reactions, including the reaction of Cupric bromide(cas: 7789-45-9Application In Synthesis of Cupric bromide)

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.Application In Synthesis of Cupric bromide

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Han, Ding-Chong; Tan, Yu-Hui; Wu, Wei-Chao; Li, Yu-Kong; Tang, Yun-Zhi; Zhuang, Jia-Chang; Ying, Ting-Ting; Zhang, Hao published an article in 2021. The article was titled 《High-temperature phase transition containing switchable dielectric behavior, long fluorescence lifetime, and distinct photoluminescence changes in 2D hybrid CuBr4 perovskite》, and you may find the article in Inorganic Chemistry.HPLC of Formula: 7789-45-9 The information in the text is summarized as follows:

A novel organic-inorganic hybrid perovskite crystal, [ClC6H4(CH2)2NH3]2CuBr4 (1), having experienced an invertible high-temperature phase transition near Tc (Curie temperature Tc = 355 K), has been successfully synthesized. The phase-transition characteristics for compound 1 are thoroughly revealed by sp. heat capacity (Cp), DTA, and differential scanning calorimetry tests, possessing 16 K broad thermal hysteresis. Multiple-temperature powder X-ray diffraction anal. further proves the phase-transition behavior of compound 1. Moreover, compound 1 exhibits a significant steplike dielec. response near Tc, revealing that it can be deemed to be a promising dielec. switching material. The variable-temperature fluorescence experiments show distinct photoluminescence (PL) changes of compound 1. Further investigation and calculation disclose that the fluorescence lifetime of compound 1 can reach as long as 55.46 μs, indicating that it can be a potential PL material. All of these researches contribute a substitutable avenue in the design and construction of neoteric phase-transition compounds combining high Curie temperature and PL properties. In the experiment, the researchers used Cupric bromide(cas: 7789-45-9HPLC of Formula: 7789-45-9)

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.HPLC of Formula: 7789-45-9

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

《Under pressure: electrochemically-mediated atom transfer radical polymerization of vinyl chloride》 was written by De Bon, Francesco; Ribeiro, Diana C. M.; Abreu, Carlos M. R.; Rebelo, Rafael A. C.; Isse, Abdirisak A.; Serra, Armenio C.; Gennaro, Armando; Matyjaszewski, Krzysztof; Coelho, Jorge F. J.. COA of Formula: Br2CuThis research focused onvinyl chloride electrochem mediated atom transfer radical polymerization. The article conveys some information:

The stringent control over the polymerization of less activated monomers remains one major challenge for Reversible Deactivation Radical Polymerizations (RDRP), including Atom Transfer Radical Polymerization (ATRP). Electrochem. mediated ATRP (eATRP) of a gaseous monomer, vinyl chloride (VC), was successfully achieved for the first time using a stainless-steel 304 (SS304) electrochem. reactor equipped with a simplified electrochem. setup. Controlled polymerizations were confirmed by the good agreement between theor. and measured mol. weights, as well as the relatively narrow mol. weight distributions. Preservation of chain-end fidelity was verified by chain extension experiments, yielding poly(vinyl chloride) (PVC) homopolymers, block and statistical copolymers. The possibility of synthesizing PVC by eATRP is a promising alternative to afford cleaner (co)polymers, with low catalyst concentration The metal body of the reactor was also successfully used as a cathode. The setup proposed in this contribution opens an avenue for the polymerization of other gaseous monomers. In the experiment, the researchers used many compounds, for example, Cupric bromide(cas: 7789-45-9COA of Formula: Br2Cu)

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.COA of Formula: Br2Cu

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

《A Catalyst System Based on Copper(II) Bromide Supported on Zeolite HY with a Hierarchical Pore Structure in Benzyl Butyl Ether Synthesis》 was published in Petroleum Chemistry in 2020. These research results belong to Bayguzina, A. R.; Gallyamova, L. I.; Agliullin, M. R.; Khusnutdinov, R. I.. Related Products of 7789-45-9 The article mentions the following:

Novel catalyst systems based on CuBr2 supported on zeolite HY with a hierarchical pore structure have been proposed for benzyl Bu ether synthesis by the intermol. dehydration of benzyl and Bu alcs. It has been shown that catalyst systems with a CuBr2 content of ∼10 wt % provide a benzyl Bu ether yield of ∼95% at 150°C. The experimental part of the paper was very detailed, including the reaction process of Cupric bromide(cas: 7789-45-9Related Products of 7789-45-9)

Cupric bromide(cas: 7789-45-9) can be used as reducing agent, when complexed by three molecules of pyridine initiators for the controlled polymerization of styrene, methyl acrylate and methyl methacrylate.Related Products of 7789-45-9

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

The author of 《ATRP of methyl acrylate by continuous feeding of activators giving polymers with predictable end-group fidelity》 were Wang, Yu. And the article was published in Polymers (Basel, Switzerland) in 2019. Electric Literature of Br2Cu The author mentioned the following in the article:

Atom transfer radical polymerization (ATRP) of Me acrylate (MA) was carried out by continuous feeding of Cu(I) activators. Typically, the solvent, the monomer, the initiator, and the CuBr2/Me6TREN deactivator are placed in a Schlenk flask (Me6TREN: tris[2-(dimethylamino)ethyl]amine), while the CuBr/Me6TREN activator is placed in a gas-tight syringe and added to the reaction mixture at a constant addition rate by using a syringe pump. As expected, the polymerization started when Cu(I) was added and stopped when the addition was completed, and polymers with a narrow mol. weight distribution were obtained. The polymerization rate could be easily adjusted by changing the activator feeding rate. More importantly, the loss of chain end-groups could be precisely predicted since each loss of Br from the chain end resulted in the irreversible oxidation of one Cu(I) to Cu(II). The Cu(I) added to the reaction system may undergo many oxidation/reduction cycles in ATRP equilibrium, but would finally be oxidized to Cu(II) irreversibly. Thus, the loss of chain end-groups simply equals the total amount of Cu(I) added. This technique provides a neat way to synthesize functional polymers with known end-group fidelity. The results came from multiple reactions, including the reaction of Cupric bromide(cas: 7789-45-9Electric Literature of Br2Cu)

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.Electric Literature of Br2Cu

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”