Tag: 200-300

Name: 2,6-DibromopyridineIn 2019 ,《Single-atom Rh based bipyridine framework porous organic polymer: A high active and superb stable catalyst for heterogeneous methanol carbonylationã€?appeared in Journal of Catalysis. The author of the article were Ren, Zhou; Liu, Yang; Yuan, Lyu; Song, Xiangen; Zheng, Changyong; Feng, Siquan; Jiang, Zheng; Ding, Yunjie. The article conveys some information:

A novel Rh based porous composed N polymer with hierarchical pore, high surface area and high thermal stability (Rh-POL-2BPY) was successfully obtained by impregnation of Rh2(CO)4Cl2 solution of dichloromethane. And based on Rh species as the most active carbonylation site, Rh-POL-2BPY was selected as a catalyst applied in heterogeneous methanol carbonylation system and behaved excellent carbonylation activity (TOF ~1400 h-1) under 195 °C, 2.5 MPa, higher than the corresponding homogeneous system without acetic acid. In addition, contrast to the most reported unstable heterogeneous methanol carbonylation systems, Rh-POL-2BPY could maintain incredibly outstanding stability for near 400 h owing to the firm coordination bond between Rh and N and high exposed N content in the polymer. Here, POL-2BPY apart from its heat-resisting property acts as massive rivets to immobilize the Rh species in its framework solidly during carbonylation process. XPS, XANES, HAADF-STEM and EXAFS results verify the N species of bipyridine, the single atom dispersion of Rh and Rh-N coordination bond. And above all, the novel five-coordinated Rh center is proposed as the real active site of methanol carbonylation by EXAFS spectra. In the experimental materials used by the author, we found 2,6-Dibromopyridine(cas: 626-05-1Name: 2,6-Dibromopyridine)

2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. Pyridine and pyridine-derived structures are privileged pharmacophores in medicinal chemistry and an essential functionality for organic chemists. As the prototypical π-deficient heterocycle, pyridine illustrates distinctive chemistry as both substrate and reagent. Name: 2,6-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 2,5-DibromopyridineIn 2021 ,《Random copolymerization of regiorandom polythiophene to improve planarity, aggregation and hole-transportã€?appeared in Dyes and Pigments. The author of the article were Opoku, Henry; Ahn, Hyungju; Jo, Jea Woong. The article conveys some information:

Charge transport in semiconducting conjugated polymers mainly devolves on the solid-state ordering of polymer chains with respect to its packing and orientation. Therefore, controlling the inter- and intra-mol. interactions of polymer chains is vital for achieving high performance conjugated polymers for electronic applications. Herein, by a macromol. design scheme, we optimized the microstructure of a regiorandom poly (thiophene) copolymer for efficient charge transport. By introducing side chain-free Ph and pyridyl units into the backbone, we achieved regiorandom polymers possessing improved inter- and intra-mol. interactions with a much closer π-π mol. stacking and a larger size of crystallites. Improved charge carrier motion and transport in both vertical and horizontal directions were revealed when the resulting Ph and pyridyl substituted polymers were applied as hole-transporting materials in organic field-effect transistors, diode-like space-charge-limited current devices, and perovskite solar cells. Particularly, the pyridyl substituted polymer exhibited more than two times higher charge carrier mobilities in the above mentioned device configurations compared with the pristine regiorandom poly (thiophene). In addition to this study using 2,5-Dibromopyridine, there are many other studies that have used 2,5-Dibromopyridine(cas: 624-28-2Reference of 2,5-Dibromopyridine) was used in this study.

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine and pyridine-derived structures are privileged pharmacophores in medicinal chemistry and an essential functionality for organic chemists. As the prototypical π-deficient heterocycle, pyridine illustrates distinctive chemistry as both substrate and reagent. Reference of 2,5-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

COA of Formula: C6H7Br2NIn 2017 ,�Pyridin-2-yl)methyl 2-oxo-1-[(pyridin-2-yl)methyl]-1,2-dihydroquinoline-4-carboxylate hemihydrate�appeared in IUCrData. The author of the article were Filali Baba, Yassir; Kandri Rodi, Youssef; Ouzidan, Younes; Mague, Joel T.; Ouazzani Chahdi, Fouad; Essassi, El Mokhtar. The article conveys some information:

In the title compound, C22H17N3O3·0.5H2O, the heterocyclic portion of the dihydroquinoline moiety is distinctly nonplanar. Two quinolinecarboxylate mols. are associated through hydrogen bonding to a disordered lattice water mol. These units stack along the a-axis direction assisted by C-H···O and C-H···N hydrogen bonds, as well as C-H···π(ring) interactions. The experimental part of the paper was very detailed, including the reaction process of 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8COA of Formula: C6H7Br2N)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) belongs to pyridine. The basicity and metallophilic high donor number of these π-deficient systems has long favored them as ligands in metal catalysis. The last decade saw pyridine assume a stronger role as functional group for directed C–H oxidation/activation.COA of Formula: C6H7Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Lauzon, Samuel; Schouwey, Lionel; Ollevier, Thierry published an article in Organic Letters. The title of the article was 《C2-Symmetric 2,2′-Bipyridine-α,α’-1-adamantyl-diol Ligand: Bulky Iron Complexes in Asymmetric Catalysisã€?Name: 2,6-Dibromopyridine The author mentioned the following in the article:

The synthesis of a chiral 2,2′;-bipyridine-α,α’-1-adamantyl-diol ligand was achieved starting from com. available materials. The bulky ligand was synthesized in three steps in 40% overall yield and stereoselectivities up to 98% de and >99.5% ee for the S,S enantiomer. The absolute configuration and structural insights of an heptacoordinated 2,2′-bipyridine-α,α’-1-Ad-diol/FeII chiral complex were obtained from single crystal diffraction anal. The newly synthesized ligand was used in iron-catalyzed asym. Mukaiyama aldol, thia-Michael and Diels-Alder reactions. In addition to this study using 2,6-Dibromopyridine, there are many other studies that have used 2,6-Dibromopyridine(cas: 626-05-1Name: 2,6-Dibromopyridine) was used in this study.

2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. Pyridines are often used as catalysts or reagents; particular notice has been paid recently to how pyridine coordinates to metal centers enabling a wide range of valuable reactions. Name: 2,6-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Maisuls, Ivan; Wang, Cui; Gutierrez Suburu, Matias E.; Wilde, Sebastian; Daniliuc, Constantin-Gabriel; Bruenink, Dana; Doltsinis, Nikos L.; Ostendorp, Stefan; Wilde, Gerhard; Koesters, Jutta; Resch-Genger, Ute; Strassert, Cristian A. published an article in 2021. The article was titled 《Ligand-controlled and nanoconfinement-boosted luminescence employing Pt(II) and Pd(II) complexes: from color-tunable aggregation-enhanced dual emitters towards self-referenced oxygen reportersã€? and you may find the article in Chemical Science.SDS of cas: 626-05-1 The information in the text is summarized as follows:

In this work, we describe the synthesis, structural and photophys. characterization of four novel Pd(II) and Pt(II) complexes bearing tetradentate luminophoric ligands with high photoluminescence quantum yields (ΦL) and long excited state lifetimes (τ) at room temperature, where the results were interpreted by means of DFT calculations Incorporation of fluorine atoms into the tetradentate ligand favors aggregation and thereby, a shortened average distance between the metal centers, which provides accessibility to metal-metal-to-ligand charge-transfer (3MMLCT) excimers acting as red-shifted energy traps if compared with the monomeric entities. This supramol. approach provides an elegant way to enable room-temperature phosphorescence from Pd(II) complexes, which are otherwise quenched by a thermal population of dissociative states due to a lower ligand field splitting. Encapsulation of these complexes in 100 nm-sized aminated polystyrene nanoparticles enables concentration-controlled aggregation-enhanced dual emission. This phenomenon facilitates the tunability of the absorption and emission colors while providing a rigidified environment supporting an enhanced ΦL up to about 80% and extended τ exceeding 100 μs. Addnl., these nanoarrays constitute rare examples for self-referenced oxygen reporters, since the phosphorescence of the aggregates is insensitive to external influences, whereas the monomeric species drop in luminescence lifetime and intensity with increasing triplet mol. dioxygen concentrations (diffusion-controlled quenching). In the experimental materials used by the author, we found 2,6-Dibromopyridine(cas: 626-05-1SDS of cas: 626-05-1)

2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. Pyridine derivatives lend themselves to many roles in the spirited field of supramolecular chemistry �whether as the ligand backbone of metal-organic polymers or presiding over the key electronic stations of nanodevices. In biochemistry, pyridine-containing cofactors are necessary nutrients on which our lives depend. SDS of cas: 626-05-1

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zhang, Fangdi; Yu, Xiankang; Xiong, Minghai; Yin, Zhihong; Wang, Yang; Yu, Junting; Cao, Jiamin; Tan, Hua; Zhang, Maojie published an article in 2021. The article was titled 《Designing efficient A-D-A1-D-A-type non-fullerene acceptors with enhanced fill factor via noncovalently conformational lockingã€? and you may find the article in Synthetic Metals.Application of 624-28-2 The information in the text is summarized as follows:

Achieving high fill factor (FF) is a great challenge for non-fullerene organic solar cells (NF-OSCs) since the FF can be influenced by many factors. Herein, two A-D-A1-D-A-type non-fullerene acceptors (NFAs) PZ-dIDTC6 and PD-dIDTC6, consisting of indacenodithiophene (IDT) dimers bridged with weak electron withdrawing pyrazine (PZ) or pyridine (PD) unit, were designed and synthesized. Relative to the PD-dIDTC6, PZ-bridged PZ-dIDTC6 showed a wider absorption range in the 500-800 nm with lower optical band gap of 1.57 eV (�0 nm red-shifted than PD-dIDTC6), due to the more planar conformation caused by noncovalently conformational locking. Furthermore, the PM6:PZ-dIDTC6 film shown higher and balanced mobility (1.33 x 10-4 cm2 V-1 s-1 for hole and 1.88 x 10-4 cm2 V-1 s-1 for electron), which contributed to the high FF of devices. OSCs based on PM6:PZ-dIDTC6 exhibited a power conversion efficiency (PCE) of 10.91% with a FF of 0.75, while the PM6:PD-dIDTC6 device yielded a PCE of 7.78% with a FF of 0.56. This work demonstrates that noncovalently conformational locking is propitious to improve the FF of devices. In addition to this study using 2,5-Dibromopyridine, there are many other studies that have used 2,5-Dibromopyridine(cas: 624-28-2Application of 624-28-2) was used in this study.

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. When pyridine is adsorbed on oxide surfaces or in porous materials, the following species are commonly observed: (i) pyridine coordinated to Lewis acid sites, (ii) pyridine H-bonded to weakly acidic hydroxyls, and (iii) protonated pyridine. At high coverage, physisorbed pyridine and protonated dimers can also be observed.Application of 624-28-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 1968,Tetrahedron included an article by Pala, Gianfranco; Crescenzi, Elda; Bietti, G.. SDS of cas: 16985-07-2. The article was titled 《New synthesis of 4,4′-dihydroxydiphenyl(2-pyridyl)-methaneã€? The information in the text is summarized as follows:

Condensing phenol with 2-pyridine carboxaldehyde was shown to give 4,4′-dihydroxydiphenyl(2-pyridyl)methane (I) together with 24-29% of its isomer 2,4′-dihydroxydiphenyl(2-pyridyl)methane (II). Recrystallization of the mixture, required to obtain I free from II, caused the yield of I to fall to scarcely 25%, based on 2-pyridine carboxaldehyde. To prevent or reduce formation of ortho condensation products, 2-pyridine carboxaldehyde was made to react with phenols halo-substituted in both or in a single ortho position. Reductive dehalogenation of the compounds thus obtained gave I in 65-70% yield. The results came from multiple reactions, including the reaction of 2,2′-(Pyridin-2-ylmethylene)diphenol(cas: 16985-07-2SDS of cas: 16985-07-2)

2,2′-(Pyridin-2-ylmethylene)diphenol(cas: 16985-07-2) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. SDS of cas: 16985-07-2The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Beccalli, Egle M.; Broggini, Gianluigi; Paladino, Giuseppe; Zoni, Caterina published an article in Tetrahedron. The title of the article was 《Palladium-mediated approach to dibenzo[b,e][1,4]diazepines and benzopyrido-analogues. An efficient synthesis of tarpaneã€?Recommanded Product: 1028-86-0 The author mentioned the following in the article:

An original synthetic route toward dibenzo[b,e][1,4]diazepin-11-ones, e.g., I, and analogs pyridobenzodiazepinones has been developed. The method relied upon an intramol. amination process between an (hetero)aryl halide and the appropriate aniline moiety. In the experimental materials used by the author, we found N-(2-Chloropyridin-3-yl)-2-nitrobenzamide(cas: 1028-86-0Recommanded Product: 1028-86-0)

N-(2-Chloropyridin-3-yl)-2-nitrobenzamide(cas: 1028-86-0) belongs to anime. To avoid the problem of multiple alkylation, methods have been devised for “blockingâ€?substitution so that only one alkyl group is introduced. The Gabriel synthesis is one such method; it utilizes phthalimide, C6H4(CO)2NH, whose one acidic hydrogen atom has been removed upon the addition of a base such as KOH to form a salt.Recommanded Product: 1028-86-0

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Product Details of 138219-98-4On March 25, 2003, Peter, Katja; Thelakkat, Mukundan published an article in Macromolecules. The article was 《Synthesis and Characterization of Bifunctional Polymers Carrying Tris(bipyridyl)ruthenium(II) and Triphenylamine Unitsã€? The article mentions the following:

The synthesis, characterization, and properties of a highly soluble bifunctional polymer are described in which a tris(bipyridyl)Ru(II) unit acts as dye and triphenylamine units act as charge transport moieties. First a macro-ligand, a bipyridine carrying two poly(4-bromostyrene) chains, was synthesized by atom transfer radical polymerization (ATRP) of 4-bromostyrene in bulk using CuCl/PMDETA as the catalytic system and bis(chloromethyl) bipyridine as the initiator. The target polymer was then obtained via a polymer amination reaction in which the bromophenyl group was converted into a triphenylamine followed by metalation of the bipyridine unit of the macro-ligand with Ru(II) bis(bipyridine). The reaction conditions of ATRP and polymer amination reaction were optimized, and the degree of conversion for both steps was determined by gas chromatog. (GC) anal. of rest monomer content and elemental anal. of unreacted bromine, resp. The control in mol. weight was achieved maintaining a narrow distribution in the desired low mol. weight range of bulk polymerization of 4-bromostyrene. The polymer amination reaction using the Pd(OAc)2 and P(t-Bu)3 system was efficient, and the reaction was complete within 2 h. The metalation reaction could be followed by UV/vis spectroscopy. MALDI-TOF MS of the three polymers was carried out to obtain absolute mol. weights and their distribution. A comparison of these mol. weights gave addnl. information about the degree of polymer amination and metalation reaction. The thermal properties of the different polymers suggest that the thermal stability and the glass transition temperature increases from the starting macro-ligand which carries poly(4-bromostyrene) chains to the intermediate polymer having poly(vinyltriphenylamine) chains and finally to the bifunctional Ru(II) polymer complex. The results came from multiple reactions, including the reaction of 4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4Product Details of 138219-98-4)

4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4) belongs to pyridine derivatives. Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals. Product Details of 138219-98-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Quality Control of 4,4′-Bis(chloromethyl)-2,2′-bipyridineOn March 1, 2019, Woo, Sung-Jun; Choi, Sunghan; Kim, So-Yoen; Kim, Pil Soo; Jo, Ju Hyoung; Kim, Chul Hoon; Son, Ho-Jin; Pac, Chyongjin; Kang, Sang Ook published an article in ACS Catalysis. The article was 《Highly Selective and Durable Photochemical CO2 Reduction by Molecular Mn(I) Catalyst Fixed on a Particular Dye-Sensitized TiO2 Platformã€? The article mentions the following:

A new Mn(I)-based hybrid system (OrgD-|TiO2|-MnP) for photocatalytic CO2 reduction is designed to be a co-assembly of Mn(4,4′-Y2-bpy)(CO)3Cl (MnP; Y = CH2PO(OH)2) and (E)-3-[5-(4-(diphenylamino)phenyl)-2,2′-bithiophen-2′-yl]-2-cyanoacrylicacid(OrgD) on TiO2 semiconductor particles. The OrgD-|TiO2|-MnP hybrid reveals persistent photocatalytic behavior, giving high turnover numbers and excellent product selectivity (HCOO- vs. CO) that surpass the catalytic activities of the related homogeneous and other heterogenized Mn photocatalytic systems reported so far. As a typical run, visible-light irradiation of the hybrid catalyst in the presence of 0.1M electron donor (ED) and 0.001M LiClO4 persistently produced HCOO- with a >99% selectivity accompanied by a trace amount of CO; the turnover number (TONformate) reached âˆ?10 after 25 h irradiation The product selectivity (HCOO-/CO) is controlled by changing the loading amount of MnP on the TiO2 surface. In-situ FTIR anal. of the hybrid during photocatalysis revealed that at low Mn concentration, the Mn-H monomeric mechanism associated with HCOO- formation is dominant, whereas at high Mn concentration, CO is formed via an Mn-Mn dimer mechanism. In the part of experimental materials, we found many familiar compounds, such as 4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4Quality Control of 4,4′-Bis(chloromethyl)-2,2′-bipyridine)

4,4′-Bis(chloromethyl)-2,2′-bipyridine(cas: 138219-98-4) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Quality Control of 4,4′-Bis(chloromethyl)-2,2′-bipyridine Pyridine has a conjugated system of six π electrons that are delocalized over the ring.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem