Tag: 200-300

Xie, Qiujian; Yang, Yumin; Zhang, Weijie; Gao, Zhu; Li, Xiaofeng; Tang, Juntao; Pan, Chunyue; Yu, Guipeng published their research in Chemical Science in 2021. The article was titled 《Polarization-induced charge separation in conjugated microporous polymers for efficient visible light-driven C-3 selenocyanation of indolesã€?Category: pyridine-derivatives The article contains the following contents:

Conjugated microporous polymers (CMPs) were cost-effective photocatalysts in organic transformations, while they were usually limited by the insufficient separation of photogenerated charges. A polarization strategy through mol. geometry optimization to promote the charge separation of CMPs was reported. Three CMP photocatalysts with an alternative donor-acceptor skeleton and tunable symmetry were synthesized by the oxidative coupling of bis-carbazoles with electron-deficient bridges (benzene/pyridine/pyrimidine). Simply regulating the polarization of the starting monomers lead to tailorable porosity, photoelec. properties and photocatalytic activity of the CMPs. They exhibited high efficiency in C-3 selenocyanation of indoles to afford selenocyanatoindoles I [R = H, 5-F, 6-Br, etc.; R1 = H, Me; R2 = H, Me] under visible-light and at room temperature, and pyridine-based CMPs with the largest dipole moment gave a yield of up to 94%, superior to their state-of-the-art photocatalyst counterparts. Photo-phys. experiments combined with theor. calculations further supported that the incorporation of the polarized linker introduced an internal elec. field, benefitted efficient charge separation2,5-Dibromopyridine(cas: 624-28-2Category: pyridine-derivatives) was used in this study.

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. Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zhang, Ting; Zhu, Min; Li, Jiuyan; Zhang, Yuyang; Wang, Xuchun published their research in Dyes and Pigments in 2021. The article was titled 《Bipolar host materials comprising carbazole, pyridine and triazole moieties for efficient and stable phosphorescent OLEDsã€?Safety of 2,5-Dibromopyridine The article contains the following contents:

Achieving an excellent device performance with slow roll-off efficiency is still a crucial requirement for phosphorescent OLEDs in displays and white lighting applications. Three bipolar host materials comprised of carbazole, pyridine and triazole units, o-CzTPy, p-CzTPy, and 3-CzTPy were synthesized and developed. They are designed by selecting the pyridine and triazole groups together as an electron-transporting unit, and varying the different linking modes of the functional groups to optimize performance. These materials possessed high triplet energies (2.66 eV-2.69 eV), and good bipolar charge transporting abilities. FIrpic and Ir(ppy)3 based blue and green PhOLEDs incorporating these bipolar hosts show low turn-on voltage, high efficiencies, and slow efficiency roll-off. A maximum efficiency of 22.25% (41.98 cd A-1) was achieved for o-CzTPy based blue device. More importantly, the o-CzTPy based green device achieved the desirable high efficiency of 29.08% (96.98 cd A-1), which is among the highest values for PhOLEDs with dopant Ir(ppy)3 ever reported in public scientific literatures. These excellent results demonstrated that these bipolar hosts possess high practical value for application in com. PhOLEDs. In the experiment, the researchers used many compounds, for example, 2,5-Dibromopyridine(cas: 624-28-2Safety of 2,5-Dibromopyridine)

2,5-Dibromopyridine(cas: 624-28-2) 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.Safety of 2,5-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 2,6-DibromopyridineIn 2022 ,《Multi-resonant thermally activated delayed fluorescence emitters based on tetracoordinate boron-containing PAHs: colour tuning based on the nature of chelatesã€?was published in Chemical Science. The article was written by Meng, Guoyun; Liu, Lijie; He, Zhechang; Hall, David; Wang, Xiang; Peng, Tai; Yin, Xiaodong; Chen, Pangkuan; Beljonne, David; Olivier, Yoann; Zysman-Colman, Eli; Wang, Nan; Wang, Suning. The article contains the following contents:

Multi-resonant thermally activated delayed fluorescence (MR-TADF) materials have attracted considerable attention recently. The mol. design frequently incorporates cycloboration. However, to the best of our knowledge MR-TADF compounds containing nitrogen chelated to boron are still unknown. Reported herein is a new class of tetracoordinate boron-containing MR-TADF emitters bearing CNC- and NNN-chelating ligands. We demonstrate that the replacement of the B-C covalent bond in the CNC-chelating ligand by the B-N covalent bond affords an isomer, which dramatically influences the optoelectronic properties of the mol. The resulting NNN-chelating compounds show bathochromically shifted absorption and emission spectra relative to CNC-chelating compounds The incorporation of a tert-butylcarbazole group at the 4-position of the pyridine significantly enhances both the thermal stability and the reverse intersystem crossing rate, yet has a negligible effect on emission properties. Consequently, high-performance hyperfluorescent organic light-emitting diodes (HF-OLEDs) that utilize these mols. as green and yellow-green emitters show a maximum external quantum efficiency (ηext) of 11.5% and 25.1%, and a suppressed efficiency roll-off with an ηext of 10.2% and 18.7% at a luminance of 1000 cd m-2, resp. In the experiment, the researchers used many compounds, for example, 2,6-Dibromopyridine(cas: 626-05-1Reference of 2,6-Dibromopyridine)

2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. Pyridines, quinolines, and isoquinolines have found a function in almost all aspects of organic chemistry. Pyridine has found use as a solvent, base, ligand, functional group, and molecular scaffold. As structural elements, these moieties are potent electron-deficient groups, metal-directing functionalities, fluorophores, and medicinally important pharmacophores. Reference of 2,6-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Safety of Methyl 5-bromopicolinateIn 2005 ,《Ligand creation via linking – a rapid and convenient method for construction of novel supported PyOX-ligandsã€?appeared in Tetrahedron. The author of the article were Oila, Markku J.; Tois, Jan E.; Koskinen, Ari M. P.. The article conveys some information:

A novel, tyrosine-derived, supported amino alc. linker was synthesized and used for attachment of picolinic acid derivatives onto different supports. When the resin bound mol. was further activated, the PyOX-moiety could be constructed reliably in enantiopure form. Furthermore, an efficient Pd-catalyzed modification of a picolinic acid derivative is presented. In the experiment, the researchers used many compounds, for example, Methyl 5-bromopicolinate(cas: 29682-15-3Safety of Methyl 5-bromopicolinate)

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

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Song, Ruichong; Tago, Tetsuro; Tatsuta, Maho; Shiraishi, Nana; Iwai, Kumiko; Hirano, Keiichi; Toyohara, Jun; Tanaka, Hiroshi published their research in ChemistrySelect in 2021. The article was titled 《N-Alkyl 3-aminobut-2-enenitrile as a Non-radioactive Side Product in Nucleophilic 18F-Fluorinationã€?Computed Properties of C5H3Br2N The article contains the following contents:

Acetonitrile acted as a reactant under the conventional reaction conditions for aliphatic nucleophilic 18F-fluorination in acetonitrile to provide the N-alkyl 3-aminobut-2-enenitrile (E)-I as one of the side products was found. Dimerization of acetonitrile promoted by a complex of K2CO3 and K222 provided 3-aminobut-2-enenitrile, which acted as nucleophile to provide N-alkyl amino derivatives (E)-I. Based on the finding, avoiding acetonitrile in the drying of [18F]fluoride as well as 18F-labeling enabled the preparation of 18F-labeled compounds II (X = 18F) containing only a small amount of the corresponding alc. II (X = OH). Finally, usage of an automated synthesizer to achieve an efficient phase-tag-assisted synthesis of 18F-labeled stilbene derivative as a 18F-labeled amyloid-β ligand (X = 18F) is described. The experimental part of the paper was very detailed, including the reaction process of 2,5-Dibromopyridine(cas: 624-28-2Computed Properties of C5H3Br2N)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine is widely used in the precursor to agrochemicals and pharmaceuticals. Also, it is used as an important reagent and organic solvent.Computed Properties of C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Rapid Access to Diverse Potassium Acyltrifluoroborates (KATs) through Late-Stage Chemoselective Cross-Coupling Reactionsã€?was written by Deng, Xingwang; Zhou, Guan; Han, Xiao; Ullah, Khadim; Srinivasan, Rajavel. Computed Properties of C5H3Br2N And the article was included in Organic Letters in 2021. The article conveys some information:

Functionalization of acyltrifluoroborates K[BrArCOBF3] (Ar = arylene, 2,5-thiophenediyl) was achieved by late-stage cross-coupling with arylboronic acids, arylacetylenes and aromatic amines, providing access to substituted trifluoroborates K[RArCOBF3] (R = aryl, alkynyl, arylamino). Potassium acyltrifluoroborates (KATs) are opening up new avenues in chem. biol., materials science, and synthetic organic chem. due to their intriguing reactivities. However, the synthesis of these compounds remains mostly complicated and time-consuming. Herein, we have developed chemoselective Pd-catalyzed approaches for the late-stage diversification of arenes bearing prefunctionalized KATs. These approaches feature chemoselective cross-coupling, rapid diversification, functional group tolerance, mild reaction conditions, simple operation, and high yields. In the experimental materials used by the author, we found 2,5-Dibromopyridine(cas: 624-28-2Computed Properties of C5H3Br2N)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Computed Properties of C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2018,Filali Baba, Yassir; Kandri Rodi, Youssef; Mague, Joel T.; Ouzidan, Younes; Ouazzani Chahdi, Fouad; Essassi, El Mokhtar published �Pyridin-2-yl)methyl 6-bromo-2-oxo-1-[(pyridin-2-yl)methyl]-1,2-dihydroquinoline-4-carboxylate�IUCrData published the findings.Quality Control of 2-(Bromomethyl)pyridine hydrobromide The information in the text is summarized as follows:

In the central dihydroquinoline unit of the title compound, C22H16BrN3O3, the dihydropyridinone and benzene rings are inclined to one another by 2.0 (1)°, while the outer pyridine rings are almost perpendicular to the plane of the dihydroquinoline ring system. The conformation of the mol. is partially determined by an intramol. C-H···O hydrogen bond. In the crystal, mols. stack along the b-axis direction through a combination of C-H···N and C-H···O hydrogen bonds and π-π stacking interactions involving the dihydroquinoline units, with a centroid-to-centroid distance of 3.7648 (15) Å. In the experimental materials used by the author, we found 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8Quality Control of 2-(Bromomethyl)pyridine hydrobromide)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. Quality Control of 2-(Bromomethyl)pyridine hydrobromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Flouzat, Christine; Guillaumet, Gerald published an article on January 31 ,1990. The article was titled 《A new convenient synthesis of 2-aryl- and 2-heteroaryloxazolo[5,4-b]pyridinesã€? and you may find the article in Synthesis.COA of Formula: C12H8ClN3O3 The information in the text is summarized as follows:

Aminochloropyridines I (R = H, Cl) were treated with R1COCl (R1 = Ph, 2-FC6H4, 4-ClC6H4, 2-ClC6H4, 4-MeOC6H4, 2-O2NC6H4, 4-MeC6H4, 4-NCC6H4, 2-furyl, 2-thienyl) to give 95-98% amides II. Heating II in the presence of trimethylsilyl polyphosphate ester with or without a solvent (1,2-dichlorobenzene) gave 75-98% oxazolopyridines III. In the experiment, the researchers used many compounds, for example, N-(2-Chloropyridin-3-yl)-2-nitrobenzamide(cas: 1028-86-0COA of Formula: C12H8ClN3O3)

N-(2-Chloropyridin-3-yl)-2-nitrobenzamide(cas: 1028-86-0) belongs to anime. Reaction with nitrous acid (HNO2), which functions as an acylating agent that is a source of the nitrosyl group (―NO), converts aliphatic primary amines to nitrogen and mixtures of alkenes and alcohols corresponding to the alkyl group in a complex process. This reaction has been used for analytical determination of primary amino groups in a procedure known as the Van Slyke method.COA of Formula: C12H8ClN3O3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Synthesis and optoelectronic properties of novel fluorene-bridged dinuclear cyclometalated iridium (III) complex with A-D-A framework in the single-emissive-layer WOLEDsã€?was written by He, Keqi; Wang, Xiangdong; Yu, Junting; Jiang, Haigang; Xie, Guangshan; Tan, Hua; Liu, Yu; Ma, Dongge; Wang, Yafei; Zhu, Weiguo. Product Details of 29682-15-3This research focused onWOLED SEL framework fluorine bridged dinuclear cyclometalated iridium complex; complex optoelectronic property Suzuki coupling reaction. The article conveys some information:

To explore the influence of push-pull chromophores on properties of emitter in organic light-emitting devices (OLEDs), an acceptor-donor-acceptor (A-D-A)-based dinuclear iridium (III) complex of (dfppy)4Ir2(dipic-FL) was synthesized via Suzuki coupling reaction, in which dfppy is 2-(2,4-difluorophenyl)pyridine and dipic-FL is 2,7-di(5-pyridyl-2-carboxyl)-9,9-dioctyl-9H-fluorene. An intense emission peak at about 480 nm resulting from the (dfppy)2Ir(pic) chromophore and a weak long-wavelength emission band at 580-660 nm attributed to intramol. charge transfer transition were exhibited for (dfppy)4Ir2(dipic-FL) in dichloromethane solution But a remarkably hypsochromic photoluminescence profile with an intense characteristic emission peak at 422 nm was observed, which is attributed to the intraligand (IL) π-π* excited states in its thin film. White emission with a maximum luminance of 1040 cd/m2 and current efficiency of 1.2 cd/A was obtained in its single-emissive-layer (SEL) OLEDs with a configuration of ITO/PEDOT:PSS/(dfppy)4Ir2(dipic-FL) (10 wt%):TCTA/TPBi/LiF/Al. To our knowledge, this is one of the best examples in term of dinuclear iridium complex as single dopant in the high-performance white-emitting SEL-OLEDs.Methyl 5-bromopicolinate(cas: 29682-15-3Product Details of 29682-15-3) was used in this study.

Methyl 5-bromopicolinate(cas: 29682-15-3) belongs to pyridine. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Additionally, pyridine-based natural products continue to be discovered and studied for their properties and to understand their biosynthesis.Product Details of 29682-15-3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 624-28-2In 2022 ,《Stable Porous Organic Polymers Used for Reversible Adsorption and Efficient Separation of Trace SO2ã€?was published in ACS Macro Letters. The article was written by Dai, Zhifeng; Chen, Wei; Kan, Xun; Li, Fangyao; Bao, Yuanfei; Zhang, Fei; Xiong, Yubing; Meng, Xiangju; Zheng, Anmin; Xiao, Feng-Shou; Liu, Fujian. The article contains the following contents:

The development of porous solid adsorbents for selective adsorption and separation of SO2 has attracted much attention recently. Herein, we design porous organic polymers (POPs) decorated with pyridine ligands as building units (POP-Py) through a radical polymerization of the 2,5-divinylpyridine (v-Py) monomer. Due to its high BET surface area, nanoporosity, and excellent stability, the prepared POP-Py can be used for reversible adsorption and efficient separation of SO2. The POP-Py possesses a SO2 capacity of 10.8 mmol g-1 at 298 K and 1.0 bar, which can be well retained after 6 recycles, showing an excellent reversible adsorption capacity. The POP-Py also shows superior separation performance for SO2 from a ternary SO2/CO2/N2 mixture (0.17/15/84.83v%), giving a breakthrough time and a saturated SO2 capacity at 178 min g-1 and 0.4 mmol g-1. The retention time was well maintained even under high moisture conditions, confirming its superior water resistance. Furthermore, when other vinyl-functionalized organic ligand monomers (bipyridine, pyrimidine, and pyrazine) were employed for radical polymerization, all of the resultant porous organic ligand polymers (POP-BPy, POP-PyI, and POP-PyA) exhibited superior performance for reversible adsorption and efficient separation of SO2. The combined features of reversible adsorption, efficient separation, and water resistance are important for the industrial applications of these materials as SO2 adsorbents. In the part of experimental materials, we found many familiar compounds, such as 2,5-Dibromopyridine(cas: 624-28-2Related Products of 624-28-2)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridines, quinolines, and isoquinolines have found a function in almost all aspects of organic chemistry. Pyridine has found use as a solvent, base, ligand, functional group, and molecular scaffold. As structural elements, these moieties are potent electron-deficient groups, metal-directing functionalities, fluorophores, and medicinally important pharmacophores. Related Products of 624-28-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem