Month: November 2022

Luo, Xuewei; Zhang, Bo; Xi, Chanjuan published their research in Green Chemistry in 2021. The article was titled 《Photoredox-catalyzed hydroxydifluoroacetylation of alkenes with FSO2CF2CO2Me and H2O: simple synthesis of CF2CO2Me-containing alcohols and difluorolactonesã€?HPLC of Formula: 94928-86-6 The article contains the following contents:

Photoredox-catalyzed hydroxydifluoroacetylation of alkenes with FSO2CF2CO2Me and H2O was presented. In this reaction, -CF2CO2Me and -OH groups were simultaneously introduced into the CC bond of the alkenes using fac-[Ir(ppy)3] as the photocatalyst under visible light irradiation giving CF2CO2Me-containing alcs. and/or difluorolactones in high yields with high regioselectivity under mild conditions. The experimental process involved the reaction of fac-Tris(2-phenylpyridine)iridium(cas: 94928-86-6HPLC of Formula: 94928-86-6)

fac-Tris(2-phenylpyridine)iridium(cas: 94928-86-6) 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.HPLC of Formula: 94928-86-6

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Yao, Xing-Qi; Tong, Wen-Yan; Wang, Kang; Qu, Shuanglin; Wang, Jianbo published their research in Organometallics in 2021. The article was titled 《Azacycle-Directed Formal Aromatic C(sp2)-H Insertion with Cr(0) Fischer Carbene Complex via Oxidative Hydrogen Migrationã€?HPLC of Formula: 3510-66-5 The article contains the following contents:

An azacycle-directed intermol. aromatic C(sp2)-H functionalization of Cr(0) Fischer carbene complexes under catalyst-free conditions is reported. Arenes with pyridines, pyrimidine, and pyrazole as directing groups reacted with chromium(0) carbene complexes in good yields and excellent regioselectivities. According to the mechanistic studies based on experiments and computations with d. functional theory (DFT), the reaction is proposed to follow an unconventional mechanism via oxidative hydrogen migration and reductive elimination, which is different from the classical electrophilic substitution mechanism.2-Bromo-5-methylpyridine(cas: 3510-66-5HPLC of Formula: 3510-66-5) was used in this study.

2-Bromo-5-methylpyridine(cas: 3510-66-5) 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.HPLC of Formula: 3510-66-5

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Chen, Hang; Tang, Xiao; Ye, Hebo; Wang, Xinchang; Zheng, Hao; Hai, Yu; Cao, Xiaoyu; You, Lei published their research in Organic Letters in 2021. The article was titled 《Effects of n â†?π* Orbital Interactions on Molecular Rotors: The Control and Switching of Rotational Pathway and Speedã€?Category: pyridine-derivatives The article contains the following contents:

The role of n â†?π* orbital interactions in the rotational pathway and barrier of biaryl-based mol. rotors was elucidated through a combined exptl. and computational study. The n â†?π* interaction in the transition state can lead to the acceleration of rotors. The competition between the n â†?π* interaction and hydrogen bonding further enabled the reversal of the pathway and greasing/braking the rotor in response to acid/base stimuli, thereby creating a switchable mol. rotor. In the experiment, the researchers used 2-Bromonicotinaldehyde(cas: 128071-75-0Category: pyridine-derivatives)

2-Bromonicotinaldehyde(cas: 128071-75-0) 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.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

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

Guan, Qixia; Guo, Hao; Xue, Rui; Wang, Mingyue; Wu, Ning; Cao, Yujuan; Zhao, Xin; Yang, Wu published an article in 2021. The article was titled 《Electrochemical sensing platform based on covalent organic framework materials and gold nanoparticles for high sensitivity determination of theophylline and caffeineã€? and you may find the article in Microchimica Acta.Name: 2,6-Diaminopyridine The information in the text is summarized as follows:

A new covalent organic framework (COF) has been prepared with 1,3,6,8-tetra(4-formyl phenyl) pyrene (TFPPy) and 2,6-diaminopyridine (DP) as building units through a Schiff base reaction by a simple tube oven heating procedure and the structure of the COF has been characterized in detail. The obtained DP-Py COF is employed to fabricate a novel electrochem. sensing platform for sensitive and selective determination of theophylline (TP) and caffeine (CAF) simultaneously through compounding with AuNPs; the peak positions of TP and CAF are 0.95 V and 1.28 V, resp. The synergistic effect between DP-Py COF and AuNPs effectively enhances the anal. sensitivity for the target analytes. Under the optimized exptl. conditions, the electrochem. sensing platform shows a sensitive voltammetric response and wide linear range to both TP and CAF, and the detection limits are 0.19μM and 0.076μM (S/N = 3), resp. This method has been successfully used for the determination of TP and CAF in compound paracetamol capsules and black tea samples. The recovery and relative standard deviations (RSD) of TP are 99.3âˆ?01% and 97.6âˆ?01% and 1.3âˆ?.0% and 1.3âˆ?.1%, resp., and the recovery and RSD of CAF are 96.1âˆ?02% and 99.4âˆ?04% and 2.8âˆ?.9% and 1.7âˆ?.2%, resp. Compared with traditional detection methods, the constructed sensing platform has better performance and is expected to be widely used also in other real sample analyses. In addition to this study using 2,6-Diaminopyridine, there are many other studies that have used 2,6-Diaminopyridine(cas: 141-86-6Name: 2,6-Diaminopyridine) was used in this study.

2,6-Diaminopyridine(cas: 141-86-6) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Name: 2,6-Diaminopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Li, Maoqiu; Yu, Junting; Liu, Denghui; Tan, Shuai; Yang, Xiaoqin; Cao, Liqin; Tan, Yuna; Cao, Jiamin; Tan, Hua; Wang, Yafei; Zhu, Weiguo published an article in 2021. The article was titled 《Enhancing the efficiency of near-infrared iridium (III) complexes-based OLEDs by auxiliary ligand functionalizationã€? and you may find the article in Synthetic Metals.SDS of cas: 29682-15-3 The information in the text is summarized as follows:

In order to enhance the charge balance of organic near IR (NIR) electroluminescent devices, an ancillary ligand of pic-SCz which was covalently linking the bipolar group SCz (composed of PS (S) and tBuCz (Cz)) to pic (SCz=3,6-di-tert-butyl-9-(4-(phenylsulfonyl)phenyl)-9H-carbazole; PS = Ph sulfone; tBuCz = 3,6-di-tert-butylcarbazole; pic= 2-picolinic acid) was developed for iridium (III) complex (TPA-BTz-Iq)2Ir(pic-SCz). Compared with parent complex (TPA-BTz-Iq)2Irpic, the photophys. and electroluminescent properties of (TPA-BTz-Iq)2Ir(pic-SCz) were improved by introducing Cz as hole transporting unit and PS as electron transporting unit. In phosphorescent organic light emitting devices (OLEDs), using (TPA-BTz-Iq)2Ir(pic-SCz) as the luminescent dopant, we obtained a maximum external quantum efficiency (EQEmax) of 0.95% at the wavelength of 712 nm. This is 3.28 times as much as that of (TPA-BTz-Iq)2Irpic (EQEmax is 0.29% at 712 nm). The experimental part of the paper was very detailed, including the reaction process of Methyl 5-bromopicolinate(cas: 29682-15-3SDS of cas: 29682-15-3)

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

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zhu, Huilong; Xing, Junhao; Wu, Changhui; Wang, Chenhong; Yao, Weijun; Dou, Xiaowei published an article in 2022. The article was titled 《Rhodium-Catalyzed Chemodivergent Pyridylation of Alkynes with Pyridylboronic Acidsã€? and you may find the article in Organic Letters.Electric Literature of C5H6BNO2 The information in the text is summarized as follows:

The pyridylation of alkynes with pyridylboronic acids is realized under rhodium catalysis. Chemodivergent pyridylation products, including alkenylpyridines produced via the hydropyridylation pathway and cyclopenta[c]pyridines produced via the pyridylation/cyclization pathway, were selectively produced by fine-tuning the reaction conditions. A mechanistic study revealed that 1,4-rhodium migration to the pyridine ring was involved as the key step in the chemodivergent synthesis. The results came from multiple reactions, including the reaction of Pyridin-3-ylboronic acid(cas: 1692-25-7Electric Literature of C5H6BNO2)

Pyridin-3-ylboronic acid(cas: 1692-25-7) 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.Electric Literature of C5H6BNO2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Zhong, Shuai; Zhou, Zhiwei; Zhao, Feng; Mao, Guojiang; Deng, Guo-Jun; Huang, Huawen published an article in Organic Letters. The title of the article was 《Deoxygenative C-S Bond Coupling with Sulfinates via Nickel/Photoredox Dual Catalysisã€?Application of 3510-66-5 The author mentioned the following in the article:

The C-S bond formation from aryl halides and thiols has been well established under various catalytic systems. In this work, user-friendly sulfinates have been exploited as an efficient sulfenylating reagent in the C-S couplings through visible light-induced photo/nickel dual catalysis under base- and external reductant-free conditions. A large number of aryl sulfide products were accessed with high selectivity and high tolerance of various functionalities. After reading the article, we found that the author used 2-Bromo-5-methylpyridine(cas: 3510-66-5Application of 3510-66-5)

2-Bromo-5-methylpyridine(cas: 3510-66-5) 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.Application of 3510-66-5

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Yin, Si-Yong; Pan, Chongqing; Zhang, Wen-Wen; Liu, Chen-Xu; Zhao, Fangnuo; Gu, Qing; You, Shu-Li published an article in Organic Letters. The title of the article was 《SCpRh(III)-Catalyzed Enantioselective Synthesis of Atropisomers by C2-Arylation of Indoles with 1-Diazonaphthoquinonesã€?Quality Control of 2-Bromo-5-methylpyridine The author mentioned the following in the article:

The Rh(III)-catalyzed highly enantioselective C2-arylation of indole derivatives with 1-diazonaphthoquinones is reported. In the presence of 2.5 mol % SCpRh complex and 20 mol% AgNO3, the C2-arylation reactions of indoles proceeded smoothly, affording a wide range of C2-arylated indole atropisomers in good yields and enantioselectivity (�6% yield, �7% ee) under mild conditions. The method displays a broad substrate scope and good functional group tolerance. In the experiment, the researchers used many compounds, for example, 2-Bromo-5-methylpyridine(cas: 3510-66-5Quality Control of 2-Bromo-5-methylpyridine)

2-Bromo-5-methylpyridine(cas: 3510-66-5) 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-Bromo-5-methylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem