Day: October 24, 2022

《One-Pot Synthesis of Indoles and Pyrazoles via Pd-Catalyzed Couplings/Cyclizations Enabled by Aqueous Micellar Catalysis》 was written by Landstrom, Evan B.; Akporji, Nnamdi; Lee, Nicholas R.; Gabriel, Christopher M.; Braga, Felipe C.; Lipshutz, Bruce H.. Application In Synthesis of 2-Bromo-5-methylpyridine And the article was included in Organic Letters in 2020. The article conveys some information:

An effective one-pot synthesis of either indoles or pyrazoles can be achieved via Pd-catalyzed aminations followed by subsequent cyclizations facilitated by aqueous micellar catalysis. This new technol. includes efficient couplings with low loadings of palladium, a more stable source of the required hydrazine moiety, greater atom economy for the initial coupling, and reduced reaction temperatures, all leading to environmentally responsible processes. In the part of experimental materials, we found many familiar compounds, such as 2-Bromo-5-methylpyridine(cas: 3510-66-5Application In Synthesis of 2-Bromo-5-methylpyridine)

2-Bromo-5-methylpyridine(cas: 3510-66-5) belongs to pyridine. Pyridines form stable salts with strong acids. Pyridine itself is often used to neutralize acid formed in a reaction and as a basic solvent. Application In Synthesis of 2-Bromo-5-methylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《ON/OFF Photoswitching and Thermoinduced Spin Crossover with Cooperative Luminescence in a 2D Iron(II) Coordination Polymer》 was written by Ghosh, Subrata; Kamilya, Sujit; Pramanik, Titas; Rouzieres, Mathieu; Herchel, Radovan; Mehta, Sakshi; Mondal, Abhishake. Related Products of 2510-22-7 And the article was included in Inorganic Chemistry in 2020. The article conveys some information:

A 2D coordination polymer, {[Fe(L)2(NCSe)2]·6MeOH·14H2O}n (1; L = 2,5-dipyridylethynylene-3,4-ethylenedioxythiophene), has been synthesized based on a redox active luminescence ligand. 1 possesses a 2D [4 x 4] square-grid network where the iron(II) center is in a FeN6 octahedral coordination environment. 1 displays reversible thermoinduced high-spin (HS; S = 2) to diamagnetic low-spin (LS; S = 0) ON/OFF spin-state switching with a T1/2 value of 150 K. Interestingly, optical reflectivity and photomagnetic studies at 10 K under light irradiation revealed an efficient conversion to a photoinduced metastable HS excited state from a LS ground state. Remarkably, the photoexcited HS state can be reversibly switched ON and OFF by using 625 and 850 nm light-emitting-diode lights. Intriguingly, the thermal dependence of the luminescence intensity of the maximum emission at 524 nm for 1 shows a min. at around the spin-crossover (SCO) temperature, indicating a cooperative nature between the SCO and luminescence properties. Theor. calculations confirmed the above findings. A 2D [4 x 4] square-grid iron(II) coordination polymer based on a 3,4-ethylenedioxythiophene-containing redox active luminescence ligand has been investigated. Temperature and/or light irradiation significantly alters the cooperative magnetic and optical properties, implying that the material exhibits reversible thermo- and photoinduced ON/OFF spin-state switching behavior with cooperative luminescence properties. The experimental process involved the reaction of 4-Ethynylpyridine(cas: 2510-22-7Related Products of 2510-22-7)

4-Ethynylpyridine(cas: 2510-22-7) 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.Related Products of 2510-22-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《A nitrogen-doped nanotube molecule with atom vacancy defects》 was written by Ikemoto, Koki; Yang, Seungmin; Naito, Hisashi; Kotani, Motoko; Sato, Sota; Isobe, Hiroyuki. Recommanded Product: 2,6-Dibromopyridine And the article was included in Nature Communications in 2020. The article conveys some information:

Nitrogen-doped carbon nanotubes have attracted attention in various fields, but lack of congeners with discrete mol. structures has hampered developments based on in-depth, chem. understandings. In this study, a nanotube mol. doped periodically with multiple nitrogen atoms has been synthesized by combining eight 2,4,6-trisubstituted pyridine units with thirty-two 1,3,5-trisubstituted benzene units. A synthetic strategy involving geodesic phenine frameworks is sufficiently versatile to tolerate pyridine units without requiring synthetic detours. Crystallog. analyses adopting aspherical multipole atom models reveal the presence of axially rotated structures as a minor disordered structure, which also provides detailed mol. and electronic structures. The nitrogen atoms on the nanotube serve as chem. distinct sites covered with neg. charged surfaces, and they increase the chance of electron injections by lowering the energy levels of the unoccupied orbitals that should serve as electron acceptors. In the experiment, the researchers used many compounds, for example, 2,6-Dibromopyridine(cas: 626-05-1Recommanded Product: 2,6-Dibromopyridine)

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. Recommanded Product: 2,6-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Phosphate and Water Sensing with a Zinc-Dipicolylamine-Based Charge-Transfer Dye》 was written by Gayton, Jacqueline; Autry, Shane A.; Kolodziejczyk, Wojciech; Hill, Glake A.; Hammer, Nathan I.; Delcamp, Jared H.. Recommanded Product: Bis(pyridin-2-ylmethyl)amine And the article was included in ChemistrySelect in 2020. The article conveys some information:

A D-π-A (donor-π bridge-acceptor) dye with a conjugated dipicolylamine group as the donor was synthesized and characterized. When zinc is bound to the dipicolylamine ligand, charge transfer strength from the donor is decreased resulting in a large blue-shift in the absorption spectrum with a quenching of dye emission. Upon addition of phosphate, changes in both the absorption and emission spectrum are observed with intermediate states between the starting zinc complex and free dye observed The zinc-dye complex was found to react with two equivalent of phosphate or trace water to give the free dye. The water response is unexpected given the widespread use of the dipicolylamine group as an anion sensor in water. When the dipicolylamine group is part of conjugated D-π-A dye designs with zinc complexes, the dye is observed to act as a humidity sensor at low water amounts In the part of experimental materials, we found many familiar compounds, such as Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Recommanded Product: Bis(pyridin-2-ylmethyl)amine)

Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0) is a secondary amine with two picolyl substituents. The compound is a tridentate ligand in coordination chemistry and commonly used to produce Zn-based chemosensors/probes, such as Zinpry.Recommanded Product: Bis(pyridin-2-ylmethyl)amine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Bag, Sukdev; Jana, Sadhan; Pradhan, Sukumar; Bhowmick, Suman; Goswami, Nupur; Sinha, Soumya Kumar; Maiti, Debabrata published their research in Nature Communications in 2021. The article was titled 《Imine as a linchpin approach for meta-C-H functionalization》.Reference of 5-Bromo-2-chloropyridine The article contains the following contents:

An temporary directing group (TDG) for meta-C-H functionalization via reversible imine formation were reported. By overruling facile ortho-C-H bond activation by imine-N atom, a suitably designed pyrimidine-based TDG successfully delivered selective meta-C-C bond formation. Application of this temporary directing group strategy for streamlining the synthesis of complex organic mols. without any necessary pre-functionalization at the meta position were explored.5-Bromo-2-chloropyridine(cas: 53939-30-3Reference of 5-Bromo-2-chloropyridine) was used in this study.

5-Bromo-2-chloropyridine(cas: 53939-30-3) belongs to pyridine. In industry and in the lab, pyridine is used as a reaction solvent, particularly when its basicity is useful, and as a starting material for synthesizing some herbicides, fungicides, and antiseptics.Reference of 5-Bromo-2-chloropyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Lin, Na; Huang, Lei; Ding, Huan-huan; Zhang, Yue; Dong, Wen-jing; Xia, Bin-yuan; Ren, Wen-sheng; Zhao, Dong published their research in Organic Chemistry Frontiers in 2021. The article was titled 《Synthesis of para-linked azacalix[n]pyridine[n]pyrazines and their uranyl ion binding properties》.Application of 626-05-1 The article contains the following contents:

Based on the fragment coupling strategy, the novel macrocycles, para-linked azacalix[n]pyridine[n]pyrazines (n = 2 and 4) with coexisting different heteroaromatics, were synthesized readily starting from 2,5-dibromopyrazine and 2,6-dibromopyridine. According to the X-ray diffraction anal., the macrocycle azacalix[4]pyridine[4]pyrazine adopted a unique boat-type conformation with a large rectangular cavity in the solid state. The complexation between the azacalix[n]pyridine[n]pyrazines and uranyl ions was investigated by DFT calculations and 1H NMR and UV-vis titration experiments It was found that they were strong host mols. to form 1 : 1 complexes with uranyl ions with an association constant of up to (1.38 +/= 0.04) x 105 M-1. After reading the article, we found that the author used 2,6-Dibromopyridine(cas: 626-05-1Application of 626-05-1)

2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. Pyridine’s structure is isoelectronic with that of benzene, but its properties are quite different. Pyridine is completely miscible with water, whereas benzene is only slightly soluble. Like all hydrocarbons, benzene is neutral (in the acid–base sense), but because of its nitrogen atom, pyridine is a weak base.Application of 626-05-1

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Gao, Xiang-Jing; Zheng, He-Gen published their research in Dalton Transactions in 2021. The article was titled 《The difference in the CO2 adsorption capacities of different functionalized pillar-layered metal-organic frameworks (MOFs)》.Computed Properties of C5H3Br2N The article contains the following contents:

The excessive use of fossil energy has caused the CO2 concentration in the atm. to increase year by year. MOFs are ideal CO2 adsorbents that can be used in CO2 capture due to their excellent characteristics. Studies of the structure-activity relation between the small structural differences in MOFs and the CO2 adsorption capacities are helpful for the development of efficient MOF-based CO2 adsorbents. Therefore, a series of pillar-layered MOFs with similar structural and different functional groups were designed and synthesized. The CO2 adsorption tests were carried out at 273 K to explore the relation between the small structural differences in MOFs caused by different functional groups and the CO2 adsorption capacities. Significantly, compound 6 which contains a pyridazinyl group has a 30.9% increase in CO2 adsorption capacity compared to compound 1 with no functionalized group. The experimental process involved the reaction of 2,5-Dibromopyridine(cas: 624-28-2Computed Properties of C5H3Br2N)

2,5-Dibromopyridine(cas: 624-28-2) 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. Computed Properties of C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wei, Yuan-Ping; Yang, Sizhuo; Wang, Peng; Guo, Jin-Han; Huang, Jier; Sun, Wei-Yin published their research in Dalton Transactions in 2021. The article was titled 《Iron(III)-bipyridine incorporated metal-organic frameworks for photocatalytic reduction of CO2 with improved performance》.Recommanded Product: 4,4′-Dimethyl-2,2′-bipyridine The article contains the following contents:

Metal-organic frameworks (MOFs) represent an emerging class of platforms to assemble single site photocatalysts for artificial photosynthesis. In this work, we report a new CO2 reduction photocatalyst (UiO-68-Fe-bpy) based on a robust Zr(IV)-MOF platform with incorporated Fe(bpy)Cl3 (bpy refers to the 4′-methyl-[2,2′-bipyridine] moiety) via amine-aldehyde condensation. We show that this hybrid catalyst can reduce CO2 to form CO under visible light illumination with excellent selectivity and enhanced activity with respect to its parent MOF and corresponding homogeneous counterpart. Using steady state and transient absorption (TA) spectroscopy, we show that the enhanced photocatalytic activity of UiO-68-Fe-bpy is attributed to the elongated excited state lifetime of Fe(bpy)Cl3 after being incorporated to the UiO-68-NH2 platform. This work demonstrates the great potential of MOFs as a next generation platform for solar fuel conversion. After reading the article, we found that the author used 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Recommanded Product: 4,4′-Dimethyl-2,2′-bipyridine)

4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6) is used as a chemical Intermediate. It can be used for the determination of ferrous and cyanide compounds.Recommanded Product: 4,4′-Dimethyl-2,2′-bipyridine Furthermore, 4,4′-Dimethyl-2,2′-bipyridine is used in the synthesis of a series of o-phenanthroline-substituted ruthenium(II) complexes.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Lin, Shengjie; Zhou, Ping; Xu, Tingting; Fan, Lihui; Wang, Xinxin; Yue, Lianglan; Jiang, Zhenzhen; Zhang, Yuanbin; Zhang, Zhengyi; He, Yabing published their research in Inorganic Chemistry in 2021. The article was titled 《Modulation of Topological Structures and Adsorption Properties of Copper-Tricarboxylate Frameworks Enabled by the Effect of the Functional Group and Its Position》.Safety of Methyl 5-bromopicolinate The article contains the following contents:

To push forward the structural development and fully explore the potential utility, it is highly desired but challenging to regulate in a controllable manner the structures and properties of MOFs. The authors reported the structural and functional modulation of Cu(II)-tricarboxylate frameworks by employing a strategy of engineering the functionalities and their positions. Two pairs of unsym. biaryl tricarboxylate ligands modified with a Me group and a pyridinic-N atom at distinct positions were logically designed and synthesized, and their corresponding Cu(II)-based MOFs were solvothermally constructed. Diffraction analyses revealed that the variation of functionalities and their positions furnished three different types of topol. structures, which the authors ascribed to the steric effect exerted by the Me group and the chelating effect involving the pyridinic-N atom. Also, gas adsorption studies showed that three of them are potential candidates as solid separation media for acetylene (C2H2) purification, with the separation potential tailorable by altering functionalities and their locations. At 106.7 kPa and 298 K, the C2H2 uptake capacity varies from 64.1 to 132.4 cm3 (STP) g-1, while the adsorption selectivities of C2H2 over its coexisting components of CO2 and CH4 fall at 3.28-4.60 and 14.1-21.9, resp. In the experiment, the researchers used Methyl 5-bromopicolinate(cas: 29682-15-3Safety of Methyl 5-bromopicolinate)

Methyl 5-bromopicolinate(cas: 29682-15-3) 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. Safety of Methyl 5-bromopicolinate

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Roy, Sebastien A.; Zgheib, Jose; Zhou, Cuihan; Arndtsen, Bruce A. published an article in 2021. The article was titled 《Palladium catalyzed synthesis of indolizines via the carbonylative coupling of bromopyridines, imines and alkynes》, and you may find the article in Chemical Science.Formula: C6H6BrN The information in the text is summarized as follows:

Authors report herein the development of a palladium-catalyzed, multicomponent synthesis of indolizines. The reaction proceeds via the carbonylative formation of a high energy, mesoionic pyridine-based 1,3-dipole, which can underwent spontaneous cycloaddition with alkynes. Overall, this provides a route to prepare indolizines in a modular fashion from combinations of com. available or easily generated reagents: 2-bromopyridines, imines and alkynes. After reading the article, we found that the author used 2-Bromo-5-methylpyridine(cas: 3510-66-5Formula: C6H6BrN)

2-Bromo-5-methylpyridine(cas: 3510-66-5) belongs to pyridine. Pyridines form stable salts with strong acids. Pyridine itself is often used to neutralize acid formed in a reaction and as a basic solvent. Formula: C6H6BrN

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem