Tag: 100-200

Mn(III)-Porphyrin Immobilized on the Graphene Oxide-Magnetite Nanocomposite as an Efficient Heterogeneous Catalyst for the Epoxidation of Alkenes was written by Hajian, Robabeh;Bahrami, Elnaz. And the article was included in Catalysis Letters in 2022.Application of 128-08-5 This article mentions the following:

In this research, 灏?tetra-brominated meso-tetraphenylporphyrinatomanganese(III) acetate [MnTPPBr₄(OAc)] (MnPor) was anchored onto a magnetite imidazole-modified graphene oxide nanosheet (Fe₃O₄.GO.Im). The obtained catalyst (Fe₃O₄.GO.Im@MnPor) was characterized through Fourier transform IR (FT-IR) and diffuse reflectance UV-Visible spectrophotometry (DR UV-Vis), powder X-ray diffractometry (XRD), field emission SEM (FESEM), energy dispersive X-ray (EDX) spectroscopy, thermogravimetric anal. (TGA) and at. absorption spectroscopy. The characterization was performed to determine the amount of manganese porphyrin loaded on the GO support. The new immobilized catalyst was employed for the efficient epoxidation of different alkenes with urea hydrogen peroxide (UHP) and acetic acid (HOAc) as oxidant activators under mild conditions. Olefins were oxidized efficiently to their corresponding epoxide with 63-100% selectivity in the presence of Fe₃O₄.GO.Im@MnPor. Moreover, an remarkable turnover frequency (93) was achieved for the oxidation of 浼?pinene. The graphene oxide-bound Mn-porphyrin was recovered from the reaction mixture by magnetic decantation and reused several times. In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5Application of 128-08-5).

1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon鑱砨romine bond is electrophilic in nature. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Application of 128-08-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Removal of photoredox catalysts from polymers synthesized by organocatalyzed atom transfer radical polymerization was written by Chism, Katherine A.;Corbin, Daniel A.;Miyake, Garret M.. And the article was included in Journal of Polymer Science (Hoboken, NJ, United States) in 2022.Formula: C4H4BrNO2 This article mentions the following:

Organocatalyzed atom transfer radical polymerization (O-ATRP) is a method of producing polymers with precise structures under mild conditions using organic photoredox catalysts (PCs). Due to the unknown toxicity of PCs and their propensity to introduce color in polymers synthesized by this method, removal of the PC from the polymer product can be important for certain applications of polymers produced using O-ATRP. Current purification methods largely rely on precipitation to remove the PC from the polymer, but a more effective and efficient purification method is needed. In this work, an alternative purification method relying on oxidation of the PC to PC^閻? followed by filtration through a plug to remove PC^閻? from the polymer and removal of the volatiles was developed. A range of chem. oxidants and stationary phases were tested for their ability to remove PCs from polymers, revealing chem. oxidation by N-bromosuccinimide followed by a filtration through a silica plug can remove up to 99% of the PC from poly(Me methacrylate). Characterization of the polymer before and after purification demonstrated that polymer mol. weight, dispersity, and chain-end fidelity are not signficantly impacted by this purification method. Finally, this purification method was tested on a range of dihydrophenazine, phenoxazine, dihydroacridines, and phenothiazine PCs, revealing the strength of the chem. oxidant must match the oxidation potential of the PC for effective purification In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5Formula: C4H4BrNO2).

1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon闂佺偨鍎茶ぐ绲﹐mine bond is electrophilic, i.e. alkyl bromides are alkylating agents. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.Formula: C4H4BrNO2

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Synthesis of new dinuclear and mononuclear peroxovanadium(V) complexes containing biogenic co-ligands: a comparative study of some of their properties was written by Sarmah, Swapnalee;Kalita, Diganta;Hazarika, Pankaj;Borah, Ruli;Islam, Nashreen S.. And the article was included in Polyhedron in 2004.Recommanded Product: 4-Amino-3-bromophenol This article mentions the following:

Dinuclear peroxo complexes of vanadium, [V₂O₂(O₂)₃(asn)₃]閻犺櫣鏋?sub>2O (1, asn = asparagine) and [V₂O₂(O₂)₃(gln)₃]閻犺櫣鏋?sub>2O (2, gln = glutamine) were synthesized from the reaction of V₂O₅ with H₂O₂ and the resp. amino acid ligand at pH 闂?. Similar reactions conducted at pH 闂? afforded the monomeric complexes, Na[VO(O₂)₂(asn)]閻犺櫣鏋?sub>2O (3) and Na[VO(O₂)₂(gln)]閻犺櫣鏋?sub>2O (4). The compounds were characterized by elemental anal. and spectral studies. In complexes 1 and 2, the two V(V) centers are bridged by a peroxo group and an amino acid ligand occurring as a zwitterion. The monomeric complexes 3 and 4 contain peroxo groups bonded in a side-on fashion and an amino acid co-ligand binding the V(V) center through O (carboxylate) atoms. The complexes 1 and 2 rapidly degraded in aqueous solution with release of O₂ and formation of diperoxovanadate and decavanadate as shown by ⁵¹V NMR spectra whereas complexes 3 and 4 remained stable in solution for over 24 h. Extent and rate of O₂ released from the two types of complexes under the effect of catalase action further evidenced the differences in their V:O₂^2- content and mode of peroxide binding in these species. The 婵?peroxovanadate complexes 1 and 2 instantaneously oxidized bromide to a bromination-competent intermediate in phosphate buffer at physiol. pH, and also efficiently mediated bromination of organic substrates in aqueous-organic media. Complexes 3 and 4 were inactive for bromination under analogous conditions. These findings make the dinuclear complexes 1 and 2 possible candidates of mimic in the action of vanadium in bromoperoxidase. In the experiment, the researchers used many compounds, for example, 4-Amino-3-bromophenol (cas: 74440-80-5Recommanded Product: 4-Amino-3-bromophenol).

4-Amino-3-bromophenol (cas: 74440-80-5) belongs to organobromine compounds. Most of the natural organobromine compounds are produced by marine organisms, and several brominated metabolites with antibacterial, antitumor, antiviral, and antifungal activity have been isolated from seaweed, sponges, corals, molluscs, and others. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Recommanded Product: 4-Amino-3-bromophenol

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Heterocycle Annulation of Enolizable Vinyl Quinone Imides. Dihydroquinolines and Quinolines from Thermal 6闁?Electrocyclizations and Indoles from Photochemical Cyclizations was written by Parker, Kathlyn A.;Mindt, Thomas L.. And the article was included in Organic Letters in 2002.Related Products of 74440-80-5 This article mentions the following:

Enolizable vinyl quinone mono- and diimide substrates I (R = Ac, Me₃SiCH₂CH₂SO₂; X = O, NR) undergo cyclization in toluene with HMPA in the dark to provide protected 6-hydroxy and 6-amino dihydroquinolines II (R = Ac, Me₃SiCH₂CH₂SO₂; X = O, NR) in 55-71% yields. Aromatization of I (R = Ac, Me₃SiCH₂CH₂SO₂; X = O, NR) provides the corresponding quinolines upon deprotection of the dihydroquinoline nitrogens. The substrates I are prepared from bromophenylenediamines and bromoaminophenols using a Stille coupling to assemble the framework followed by deprotection (if needed) and oxidation to generate the quinone imides. When the quinone monoimides I (R = Ac, Me₃SiCH₂CH₂SO₂; X = O) are stirred in toluene with HMPA under ambient light, the hydroxyindoles III (R = Ac, Me₃SiCH₂CH₂SO₂) are obtained instead in 59-69% yields. In the experiment, the researchers used many compounds, for example, 4-Amino-3-bromophenol (cas: 74440-80-5Related Products of 74440-80-5).

4-Amino-3-bromophenol (cas: 74440-80-5) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. One prominent application of synthetic organobromine compounds is the use of polybrominated diphenyl ethers as fire-retardants, and in fact fire-retardant manufacture is currently the major industrial use of the element bromine.Related Products of 74440-80-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Phosphabarrelenes as ligands in rhodium-catalyzed hydroformylation of internal alkenes essentially free of alkene isomerization was written by Fuchs, Evelyn;Keller, Manfred;Breit, Bernhard. And the article was included in Chemistry – A European Journal in 2006.Category: bromides-buliding-blocks This article mentions the following:

Despite significant research efforts in the past, one of the remaining problems to be solved in industrially important hydroformylation is the chemoselective low-pressure hydroformylation of internal alkenes. The authors prepare a new class of phosphabarrelenes (I, R = Ph (26%, 4a), i-Pr (35%, 4b), 2,4-xylyl (47%, 4c)) by Diels Alder reactions of benzyne with phosphabenzenes. Studies of the coordination properties of I, as well as results obtained in the Rh-catalyzed hydroformylation of cyclic and acyclic internal alkenes are reported. The rhodium/phosphabarrelene catalyst displays a very high activity towards hydroformylation with an unusually low tendency towards alkene isomerization. E.g., phosphabarrelene rhodium-catalyzed hydroformylation (4c/[Rh(CO)₂acac], acac = acetylacetonate) of N-Boc-pyrroline gives exclusively the pyrroline 3-carboxaldehyde. The mol. structures of 4a and two phosphabarrelene rhodium complexes are determined by x-ray crystallog. In the experiment, the researchers used many compounds, for example, 3-Bromo-4-fluorotoluene (cas: 452-62-0Category: bromides-buliding-blocks).

3-Bromo-4-fluorotoluene (cas: 452-62-0) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Category: bromides-buliding-blocks

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

The Role of Long-Alkyl-Group Spacers in Glycolated Copolymers for High-Performance Organic Electrochemical Transistors was written by Tan, Ellasia;Kim, Jingwan;Stewart, Katherine;Pitsalidis, Charalampos;Kwon, Sooncheol;Siemons, Nicholas;Kim, Jehan;Jiang, Yifei;Frost, Jarvist M.;Pearce, Drew;Tyrrell, James E.;Nelson, Jenny;Owens, Roisin M.;Kim, Yun-Hi;Kim, Ji-Seon. And the article was included in Advanced Materials (Weinheim, Germany) in 2022.Reference of 128-08-5 This article mentions the following:

Semiconducting polymers with oligoethylene glycol (OEG) sidechains have attracted strong research interest for organic electrochem. transistor (OECT) applications. However, key mol. design rules for high-performance OECTs via efficient mixed electronic/ionic charge transport are still unclear. In this work, new glycolated copolymers (gDPP-TTT and gDPP-TTVTT) with diketopyrrolopyrrole (DPP) acceptor and thiophene (T) and vinylene (V) thiophene-based donor units are synthesized and characterized for accumulation mode OECTs, where a long-alkyl-group (C₁₂) attached to the DPP unit acts as a spacer distancing the OEG groups from the polymer backbone. gDPP-TTVTT shows the highest OECT transconductance (61.9 S cm^-1) and high operational stability, compared to gDPP-TTT and their alkylated counterparts. Surprisingly, gDPP-TTVTT also shows high electronic charge mobility in a field-effect transistor, suggesting efficient ion injection/diffusion without hindering its efficient electronic charge transport. The elongated donor unit (TTVTT) facilitates hole polaron formation to be more localized to the donor unit, leading to faster and easier polaron formation with less impact on polymer structure during OECT operation, as opposed to the TTT unit. This is supported by mol. dynamics simulation. These simultaneously high electronic and ionic charge-transport properties are achieved due to the long-alkyl-group spacer in amphipathic sidechains, providing an important mol. design rule for glycolated copolymers. In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5Reference of 128-08-5).

1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. Many of the alkyl bromine derivatives are excellent alkylating agents since bromides are good leaving groups. Tribromides, like tetrabutylammonium tribromide, are used as a solid source of bromine. N-bromosuccimide (NBS) is used for the selective bromination of allylic bonds.Reference of 128-08-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Near-infrared non-fused ring acceptors with light absorption up to 1000 nm for efficient and low-energy loss organic solar cells was written by Luo, Dou;Zhang, Yuniu;Li, Lanqing;Shan, Chengwei;Liu, Qian;Wang, Zhaojin;Choy, Wallace C. H.;Kyaw, Aung Ko Ko. And the article was included in Materials Today Energy in 2022.Related Products of 128-08-5 This article mentions the following:

It is challenging to afford both high-performance and low-energy loss (Eloss) organic solar cells (OSCs) based on near-IR (NIR) non-fused ring electron acceptors (NFREAs) with ultra-narrow bandgap. Herein, three simple NFREAs (C6OT-4F, C6EDOT-4F and PDOT-4F) with absorption up to 1000 nm are developed by using alkoxy substituted thiophene derivatives core connected to fluorinated 1,1-dicyanomethylene-3-indanone (DFIC) terminals through 4H-cyclopenta[1,2-b:5,4-b]dithiophene (CPDT) bridge. It is found that fine tuning central thiophene derivatives can surprisingly lead to different photoelec. properties and the device performances. Compared with C6EDOT-4F and PDOT-4F, C6OT-4F shows a blue-shifted absorption and an elevated LUMO level, which is beneficial for boosting Voc. As a result, optimal devices based on PTB7-Th:C6OT-4F achieve a preferable efficiency of 9.83% with a low Eloss of 0.47 eV, which is the lowest Eloss among the NFREA-based OSCs with PCE >9% and optoelectronic response over 1000 nm. This work portrays the design concept of ultra-narrow bandgap NFREAs for efficient OSCs as well as low energy loss and exploration of semitransparent photoelec. devices. In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5Related Products of 128-08-5).

1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon閳ユ彽romine bond is electrophilic, i.e. alkyl bromides are alkylating agents. Bromine-containing agents predominate because not only are they more efficient than similar chlorine-containing species, but also the high atomic weight of bromine ensures that it is present in a high mass fraction within most organobromine compounds.Related Products of 128-08-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Effect of Electron-Withdrawing Chlorine Substituent on Morphological and Photovoltaic Properties of All Chlorinated D-A-Type Quinoxaline-Based Polymers was written by Lee, Seok Woo;Shin, Hee Jeong;Park, Byoungwook;Shome, Sanchari;Whang, Dong Ryeol;Bae, Hyemin;Chung, Sein;Cho, Kilwon;Ko, Seo-Jin;Choi, Hyosung;Chang, Dong Wook. And the article was included in ACS Applied Materials & Interfaces in 2022.Related Products of 128-08-5 This article mentions the following:

The choice of the chlorine (Cl) atom as an electron-withdrawing substituent in conjugated polymers leads to a higher potential in the commercialization of polymer solar cells than its fluorine counterpart because of the versatility and cost-effectiveness of the chlorination process. In addition, the population and location of Cl substituents can significantly influence the photovoltaic characteristics of polymers. In this study, three chlorinated quinoxaline-based polymers were invented to examine the numerical and positioning effects of the Cl atom on their photovoltaic characteristics. The number of Cl substituents in the reference polymer, PBCl-Qx, was adjusted to three: two Cl atoms in the benzodithiophene-type D unit and one Cl atom in the quinoxaline-type A unit. Subsequently, two more Cl atoms were selectively introduced at the 4- and 5-positions of the alkylated thiophene moieties at the 2,3-positions of the quinoxaline moiety in PBCl-Qx to obtain the addnl. polymers PBCl-Qx4Cl and PBCl-Qx5Cl, resp. The conventional PBCl-Qx4Cl device exhibited a better power conversion efficiency (PCE) of 12.95% as compared to those of PBCl-Qx (12.44%) and PBCl-Qx5Cl (11.82%) devices. The highest PCE of the device with PBCl-Qx4Cl was ascribed to an enhancement in the open-circuit voltage and fill factor induced by the deeper energy level of the HOMO and the favorable morphol. features in its blended film with Y6. In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5Related Products of 128-08-5).

1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.Related Products of 128-08-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Synthesis and resolution of DL-phenylalanine analogues was written by Liu, Jinchun;Song, Bowen;Ma, Yu;Cai, Jun;Li, Tingyou. And the article was included in Nanjing Yike Daxue Xuebao, Ziran Kexueban in 2013.COA of Formula: C9H11Br This article mentions the following:

L-2,6-dimethylphenylalanine and L-2,4,6-trimethylphenylalanine were synthesized through enzymic resolution Racemic 2,6-dimethylphenylalanine and 2,4,6-trimethylphenylalanine were synthesized through reaction of di-Et acetamidomalonate with 2,6-dimethylbenzyl bromide or 2,4,6-trimethylbenzyl bromide, resp. The DL-amino acids were then enzymically resolved by L-amino acylase. Racemic 2,6-dimethylphenylalanine and 2,4,6-trimethylphenylalanine were synthesized through reaction of di-Et acetamidomalonate with 2,6-dimethylbenzyl bromide and 2,4,6-trimethylbenzyl bromide in yield of 87.9% and 86.0% resp. DL-2,6-dimethylphenylalanine was successfully resolved by L-amino acylase, but it was failed in the resolution of 2,4,6-trimethylphenylalanine. L-amino acylase can be used in the resolution of DL-2,6-dimethylphenylalanine, but it is ineffective in the resolution of 2,4,6-trimethylphenylalanine. In the experiment, the researchers used many compounds, for example, 2-(Bromomethyl)-1,3-dimethylbenzene (cas: 83902-02-7COA of Formula: C9H11Br).

2-(Bromomethyl)-1,3-dimethylbenzene (cas: 83902-02-7) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon鑱砨romine bond is electrophilic in nature. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. COA of Formula: C9H11Br

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Allylboronates from Vinyl Triflates and 浼?Chloroboronates by Reductive Nickel Catalysis was written by Qiao, Jin-Bao;Zhao, Zhen-Zhen;Zhang, Ya-Qian;Yin, Kai;Tian, Zhi-Xiong;Shu, Xing-Zhong. And the article was included in Organic Letters in 2020.Related Products of 4457-67-4 This article mentions the following:

Allylboronates are unique building blocks widely used in organic synthesis, but the construction of cyclic allylboranates remains a challenging subject. The authors demonstrate here a mild and efficient access to this type of compound through the cross-electrophile coupling of vinyl triflates and 浼?chloroboronates. The reaction proceeded with a good substrate scope and good functional group compatibility. The ready availability of vinyl triflates from ketones, as well as the rich chem. of allylboranates, makes the authors’ method suitable for the divergent modification of biol. active compounds Preliminary mechanistic studies revealed that 浼?chloroboronates were activated via a radical process. In the experiment, the researchers used many compounds, for example, 1-Bromo-4-methoxybutane (cas: 4457-67-4Related Products of 4457-67-4).

1-Bromo-4-methoxybutane (cas: 4457-67-4) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). Many of the alkyl bromine derivatives are excellent alkylating agents since bromides are good leaving groups. Tribromides, like tetrabutylammonium tribromide, are used as a solid source of bromine. N-bromosuccimide (NBS) is used for the selective bromination of allylic bonds.Related Products of 4457-67-4

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary