Tag: 200-300

The author of 《Hydrogen Bond-Accelerated meta-Selective C-H Borylation of Aromatic Compounds and Expression of Functional Group and Substrate Specificities》 were Lu, Xu; Yoshigoe, Yusuke; Ida, Haruka; Nishi, Mitsumi; Kanai, Motomu; Kuninobu, Yoichiro. And the article was published in ACS Catalysis in 2019. Computed Properties of C5H3Br2N The author mentioned the following in the article:

Meta-selective C-H borylation of aromatic compounds was accelerated when using urea moiety-containing bipyridine-type ligands unlike in cases involving a bipyridine-type ligand without the urea moiety. The acceleration was due to the recognition and capture of the aromatic substrates by the urea moiety of the ligand by H bonding. The acceleration was further enhanced by modifying the electronic and steric properties of the ligand. The functional group and substrate specificities were also observed using the urea moiety-containing ligands. In the experiment, the researchers used many compounds, for example, 2,5-Dibromopyridine(cas: 624-28-2Computed Properties of C5H3Br2N)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine is a relatively complex molecule and exhibits a number of different bands in IR spectra. Among others, the bands characterizing the ν8a and ν19b modes have been found to be sensitive to the coordination or protonation of the molecule. Note that the band that is diagnostic for the PyH+ ion at about 1545 cm− 1 (ν19b mode) does not overlap with any of the other bands.Computed Properties of C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Talanta included an article by Liu, Dan; Liu, Sheng; Zhang, Xinyu; Zhang, Qiong; Yu, Jianhua; Yang, Mingdi; Yang, Xingyuan; Tian, Yupeng; Zhu, Xiaojiao; Zhou, Hongping. SDS of cas: 31106-82-8. The article was titled 《A water-soluble benzoxazole-based probe: Real-time monitoring PPi via situ reaction by two-photon cells imaging》. The information in the text is summarized as follows:

Pyrophosphate (PPi) played crucial roles in various fundamental physiol. processes. Herein, a two-photon absorption (TPA) “”On-Off-On”” type benzoxazole-based fluorescence probe BN (I) was designed and synthesized, which detected PPi through Cu2+ displacing method in situ system in aqueous medium. The on-off-on process of BN recognizing PPi was verified by mass spectra and theor. calculations, which was successfully applied in TPA cells imaging. In the part of experimental materials, we found many familiar compounds, such as 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8SDS of cas: 31106-82-8)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) 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.SDS of cas: 31106-82-8

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application In Synthesis of 2,5-DibromopyridineIn 2021 ,《Synthesis and Steady State Photophysical Property Analysis of Beads on a Chain (BoC) Silsesquioxane Oligomers Containing Arene and Heteroarene Cross-linkers》 was published in Silicon. The article was written by Mahbub, Shahrea; Furgal, Joseph C.. The article contains the following contents:

Silsesquioxane-based materials are garnering considerable attention due to their unique structural and electronic properties which enable use in diverse fields of study. In this article, a series of hybrid oligomeric materials comprising a silsesquioxane (SQ) backbone linked by conjugated organic cross-linkers were investigated and their photophys. properties in the steady state absorption and emission realms were assessed. Silsesquioxanes improve the thermal and photo stabilities of the organic components, offer enhancements in the molar extinction coefficients of absorption, and have a significant influence on their emission properties. Heck cross-coupling reactions were used to build oligomers with a vinyl/phenylSQ cage backbone linked with a series of different cross-linkers including 2,7-dibromo-9-fluorenone, 2,7-dibromo-9,9-dimethylfluorene, 1,4-dibromo-2,5-dimethoxybenzene, 2,5-dibromopyridine, 2,6-dibromopyridine, 2,3-dibromothiophene, 2,5-dibromothiophene, and 2,5- dibromothieno [3,2-b]thiophene. Each of these linkers showed reasonable conversion to oligomers and exhibited a wide array of fluorescence quantum yield and shifts in the absorption and emission spectra dependent on the variations in substitution position. The study was confined to explore the overall steady state spectral properties of these synthesized hybrid materials in their solution phases. Understanding the basic photophys. processes in these materials will pave the way toward their use in photovoltaic or electroluminescence applications. The experimental process involved the reaction of 2,5-Dibromopyridine(cas: 624-28-2Application In Synthesis of 2,5-Dibromopyridine)

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. Application In Synthesis of 2,5-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Mohan, Midhun; Essalhi, Mohamed; Zaye, Sarah; Rana, Love Karan; Maris, Thierry; Duong, Adam published an article in 2021. The article was titled 《Hydrogen Bond Patterns of Dipyridone and Bis(Hydroxypyridinium) Cations》, and you may find the article in ACS Omega.Application of 624-28-2 The information in the text is summarized as follows:

Dipyridonyl-substituted derivatives I,II,III ( 2,3,4, resp.) of benzene, pyridine, and pyrazine, resp., were synthesized to examine the ability of 2-pyridone and its protonated species to direct the self-assembly by hydrogen bonding. Structural anal. by single-crystal X-ray diffraction (SCXRD) of 2 and 4 in trifluoroacetic acid demonstrated that salts are formed as a result of the transfer of protons from the acid to the base (organic species) to generate a bis(hydroxypyridinium) dication. However, if no proton transfer takes place like in the case of crystals of 3 grown from DMSO/H2O, the self-assembly is mainly directed by the typical R22(8) hydrogen bond motif of 2-pyridone. These results indicate that the process of converting a neutral 2-pyridonyl group into a hydroxypyridinium cation makes structure prediction difficult. Consequently, examination of proton transfer and assembly of dipyridone and its protonated species are of interest. In combination with SCXRD, Hirshfeld surface anal. (HSA) was also used to have a better understanding on the nature of intermol. interactions within crystal structures of 2-4. The large number of F···H/H···F, H···O/O···H, H···H, and H···C/C···H contacts revealed by HSA indicates that hydrogen bonding and van der Waals interactions mainly contribute to crystal packing. In the part of experimental materials, we found many familiar compounds, such as 2,5-Dibromopyridine(cas: 624-28-2Application of 624-28-2)

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

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2017,Molecules included an article by Xu, Shan; Sun, Chengyu; Chen, Chen; Zheng, Pengwu; Zhou, Yong; Zhou, Hongying; Zhu, Wufu. Application of 1158763-55-3. The article was titled 《Synthesis and biological evaluation of novel 8-morpholinoimidazo[1,2-a]pyrazine derivatives bearing phenylpyridine/phenylpyrimidine-carboxamides》. The information in the text is summarized as follows:

Three series of novel 8-morpholinoimidazo[1,2-a]pyrazine derivatives bearing phenylpyridine/phenylpyrimidine-carboxamides I [R = H, 4-Me, 3-F, etc.], II and III [R1 = H, 4-Me, 4-OMe, etc.] were designed and synthesized. All the compounds were evaluated for their IC50 values against three cancer cell lines (A549, PC-3 and MCF-7). Most of the target compounds exhibited moderate cytotoxicity against the three cancer cell lines. Two selected compounds III [R1 = 4-Me, 4-OMe] were further tested for their activity against PI3Kα kinase, and the results indicated that compound III [R1 = 4-OMe] showed inhibitory activity against PI3Kα kinase with an IC50 value of 1.25 μM. Structure-activity relationships (SARs) and pharmacol. results indicated that the replacement of the thiopyranopyrimidine with an imidazopyrazine was beneficial for the activity and the position of aryl group had a significant influence to the activity of these compounds The compounds II in which an aryl group substituted at the C-4 position of the pyridine ring were more active than I substituted at the C-5 position. Moreover, the cytotoxicity of compounds III bearing phenylpyrimidine-carboxamides was better than that of the compounds I and II bearing phenylpyridine-carboxamides. Furthermore, the substituents on the benzene ring also had a significant impact on the cytotoxicity and the pharmacol. results showed that electron donating groups were beneficial to the cytotoxicity. The results came from multiple reactions, including the reaction of 5-(3-Fluorophenyl)picolinic acid(cas: 1158763-55-3Application of 1158763-55-3)

5-(3-Fluorophenyl)picolinic acid(cas: 1158763-55-3) 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. Application of 1158763-55-3 Pyridine has a conjugated system of six π electrons that are delocalized over the ring.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Zhang, Qingtang; Zhang, Ya; Lian, Fei; Xu, Zongqiang; Wang, Xiaomei published an article in Ionics. The title of the article was 《Synthesis and lithium storage properties of nitrogen-containing hard carbon from conjugated microporous polymers》.Reference of 2,5-Dibromopyridine The author mentioned the following in the article:

Two kinds of hard carbons with controllable nitrogen contents (N1HC and N2HC) were prepared from 2,5-dibromopyridine and 2,5-dibromopyrazine, resp. The nitrogen contents of N1HC and N2HC are 3.75 wt% and 5.08 wt%, resp. The pore structure of N2HC was further improved by KOH activation and the activated N2HC is designated as N2HC-K. The sp. surface area of N2HC-K is considerable 1328.3 m2 g-1, which is distinctly higher than that of N2HC. The rich nitrogen content and developed pores make N2HC-K afford a high lithium storage capacity, rate performance, and excellent cycling performance. The initial reversible capacity of N2HC-K is 604.8 mAh g-1 at a c.d. of 0.1 A g-1. The specific capacity of N2HC-K after 500 cycles at 0.6 A g-1 is still as high as 488.2 mAh g-1. In the experiment, the researchers used 2,5-Dibromopyridine(cas: 624-28-2Reference of 2,5-Dibromopyridine)

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.Reference of 2,5-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,ACS Omega included an article by Chen, Zhicai; Li, Huanhuan; Tao, Ye; Chen, Lingfeng; Chen, Cailin; Jiang, He; Xu, Shen; Zhou, Xinhui; Chen, Runfeng; Huang, Wei. Electric Literature of C5H3Br2N. The article was titled 《Tuning Intramolecular Conformation and Packing Mode of Host Materials through Noncovalent Interactions for High-Efficiency Blue Electrophosphorescence》. The information in the text is summarized as follows:

Mol. conformation plays an important role in tuning the packing modes of organic optoelectronic materials to achieve enhanced and/or balanced charge transport. Here, we introduce the noncovalent intramol. interactions to the host materials of phosphorescent organic light-emitting diodes (PhOLEDs). Different numbers and/or positions of intramol. CH···N noncovalent interactions were constructed by using different N-heterocycles of pyridine, pyrimidine, and pyrazine as acceptor units and carbazole as the donor unit in a donor-acceptor-donor (D-A-D) motif. Thus, designed D-A-D mols. were synthesized facilely through a one-step Ullmann reaction in high yields, showing varied intramol. interactions to regulate the mol. conformation significantly. Impressively, owing to the quasi-parallel mol. conformation, which is beneficial for forming facile transporting channels of both holes and electrons, the newly designed host material of 9,9′-(pyridine-2,5-diyl)bis(9H-carbazole) exhibits good device performance of blue PhOLEDs with current, power, and external quantum efficiencies up to 33.0 cd A-1, 32.1 lm W-1, and 16.3%, resp. This work highlights the significant importance of the noncovalent interactions in designing advanced organic semiconductors for high-performance optoelectronic devices. After reading the article, we found that the author used 2,5-Dibromopyridine(cas: 624-28-2Electric Literature of C5H3Br2N)

2,5-Dibromopyridine(cas: 624-28-2) 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. Electric Literature of C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Viologen Derivatives Extended with Aromatic Rings Acting as Negative Electrode Materials for Use in Rechargeable Molecular Ion Batteries》 was written by Kato, Minami; Sano, Hikaru; Kiyobayashi, Tetsu; Yao, Masaru. Application of 624-28-2This research focused onviologen derivative aromatic ring electrode rechargeable mol battery; anions; charge transfer; energy storage; fluorescence; redox chemistry. The article conveys some information:

Many types of batteries have been proposed as next-generation energy-storage systems. One candidate is a rocking-chair-type “”mol. ion battery”” in which a mol. ion, instead of Li+, works as a charge carrier. Previously, a viologen-type derivative is reported as a neg. electrode material that releases and receives PF6- anions during the charge-discharge process; however, its redox potential was not satisfactorily low. Further, the two potential plateaus of this material (difference = 0.5 V) should be reduced. In this study, PF6- salts of viologen (bipyridinium) derivatives extended by aromatic rings were synthesized to obtain a neg. electrode material with a lower redox potential and small potential change during the charge and discharge processes. Some of the synthesized viologen derivatives were fluorescent even in solid-state electrodes. In the half-cell configuration, the prepared neg. electrode materials showed average voltages of approx. 2 V (vs. Li+/Li), which is lower than that of conventional viologen derivatives The experimental process involved the reaction of 2,5-Dibromopyridine(cas: 624-28-2Application of 624-28-2)

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

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Substituent Effects of 2-Pyridones on Selective O-Arylation with Diaryliodonium Salts: Synthesis of 2-Aryloxypyridines under Transition-Metal-Free Conditions》 was written by Li, Xiao-Hua; Ye, Ai-Hui; Liang, Cui; Mo, Dong-Liang. Application In Synthesis of Methyl 6-oxo-1-phenyl-1,6-dihydropyridine-3-carboxylate And the article was included in Synthesis on April 30 ,2018. The article conveys some information:

An efficient transition-metal-free strategy to synthesize 2-aryloxypyridine derivatives was developed by a selective O-arylation of 2-pyridones with diaryliodonium salts. The reaction was compatible with a series of functional groups for 2-pyridones and diaryliodonium salts such as halides, nitro, cyano and ester groups. The substituents at the C6-position of 2-pyridones favored O-arylation products because of steric hindrance. The reaction was easily performed on a gram-scale and 6-chloro-2-pyridone was a good precursor to access various unsubstituted 2-aryloxypyridines by dehalogenation. A P2Y1 lead compound analog I could be prepared in good yield over two steps. The experimental part of the paper was very detailed, including the reaction process of Methyl 6-oxo-1-phenyl-1,6-dihydropyridine-3-carboxylate(cas: 77837-09-3Application In Synthesis of Methyl 6-oxo-1-phenyl-1,6-dihydropyridine-3-carboxylate)

Methyl 6-oxo-1-phenyl-1,6-dihydropyridine-3-carboxylate(cas: 77837-09-3) 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. Application In Synthesis of Methyl 6-oxo-1-phenyl-1,6-dihydropyridine-3-carboxylateThe 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

In 2022,He, Tao; Kong, Xiang-Jing; Bian, Zhen-Xing; Zhang, Yong-Zheng; Si, Guang-Rui; Xie, Lin-Hua; Wu, Xue-Qian; Huang, Hongliang; Chang, Ze; Bu, Xian-He; Zaworotko, Michael J.; Nie, Zuo-Ren; Li, Jian-Rong published an article in Nature Materials. The title of the article was 《Trace removal of benzene vapour using double-walled metal-dipyrazolate frameworks》.Product Details of 624-28-2 The author mentioned the following in the article:

In principle, porous physisorbents are attractive candidates for the removal of volatile organic compounds such as benzene by virtue of their low energy for the capture and release of this pollutant. Unfortunately, many physisorbents exhibit weak sorbate-sorbent interactions, resulting in poor selectivity and low uptake when volatile organic compounds are present at trace concentrations Herein, we report that a family of double-walled metal-dipyrazolate frameworks, BUT-53 to BUT-58, exhibit benzene uptakes at 298 K of 2.47-3.28 mmol g-1 at <10 Pa. Breakthrough experiments revealed that BUT-55, a supramol. isomer of the metal-organic framework Co(BDP) (H2BDP = 1,4-di(1H-pyrazol-4-yl)benzene), captures trace levels of benzene, producing an air stream with benzene content below acceptable limits. Furthermore, BUT-55 can be regenerated with mild heating. Insight into the performance of BUT-55 comes from the crystal structure of the benzene-loaded phase (C6H6@BUT-55) and d. functional theory calculations, which reveal that C-H···X interactions drive the tight binding of benzene. Our results demonstrate that BUT-55 is a recyclable physisorbent that exhibits high affinity and adsorption capacity towards benzene, making it a candidate for environmental remediation of benzene-contaminated gas mixtures In the experiment, the researchers used 2,5-Dibromopyridine(cas: 624-28-2Product Details of 624-28-2)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine is a relatively complex molecule and exhibits a number of different bands in IR spectra. Among others, the bands characterizing the ν8a and ν19b modes have been found to be sensitive to the coordination or protonation of the molecule. Note that the band that is diagnostic for the PyH+ ion at about 1545 cm− 1 (ν19b mode) does not overlap with any of the other bands.Product Details of 624-28-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem