Tag: 100-200

The author of 《Molybdenum carbide prepared by a salt sealing approach as an electrocatalyst for enhanced hydrogen evolution reaction》 were Lin, Zhou; Shen, Linfan; Qu, Ximing; Zhang, Junming; Jiang, Yanxia; Sun, Shigang. And the article was published in Wuli Huaxue Xuebao in 2019. Quality Control of 2,6-Diaminopyridine The author mentioned the following in the article:

Molybdenum carbide is regarded as an excellent substitute for Pt-based catalysts in the hydrogen evolution reaction (HER), owing to its low cost, superior catalytic performance, and long-term stability. In this work, salt-sealed molybdenum carbide was prepared using sodium molybdate and 2, 6-diaminopyridine as the reactive raw materials, followed by continuous salt sealing and calcination of the precursor under an inert atm. The morphol., composition and structure of salt-sealed molybdenum carbide were determined by SEM, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and XPS. The results indicate that salt-sealed molybdenum carbide has irregular morphol. and includes nanoparticles and nanorods. A comparison of the TEM images of Mo2C with salt sealing (Mo2C/SS) and Mo2C without salt sealing (Mo2C) indicates that Mo2C/SS exhibits a smaller particle size. This suggests that salt sealing can efficiently avoid particle aggregation. The Brunauer-EmmettTeller (BET) sp. surface area of the catalysts was obtained from nitrogen adsorption/desorption isotherms. The increase in BET surface area from 2.55 to 8.14 m2·g-1 after salt sealing provides evidence for the formation of pores in the product. The results of XRD, EDS and XPS analyses show that Mo2C/SS has an orthorhombic crystal structure with molybdenum oxides on the surface, which may originate from surface oxidation Considering the results of XPS and the turnover frequency (TOF) calculation, we can conclude that the formation of pores via salt sealing contributes to the exposure of more active sites, while simultaneously enlarging the contact area with oxygen. Therefore, higher molybdenum oxide content is generated on the surface, resulting in a lower proportion of active centers (molybdenum carbides) on the catalyst surface. Furthermore, the pseudocapacitance generated by the faradaic reaction of molybdenum oxides is superimposed on the double-layer capacitance of Mo2C catalysts, which increases the double layer capacitance. Since the effect of pseudo-capacitance on Mo2C/SS is more significant, the TOF number declines after salt sealing. Compared with Mo2C, Mo2C/SS exhibits three features that promote HER mass activity: (1) the generation of large quantities of pores via salt sealing leads to an increase in the BET surface area and exposure of more active sites, which is beneficial for improving HER performance; (2) the porous structure and enlarged surface area pave the way for effective mass and charge transfer; (3) the decrease of the Tafel slope from 145 to 88 mV·dec-1. In summary, salt-sealed Mo2C exhibited enhanced HER activity with an overpotential of 175 m V to achieve a c.d. of 10 mA·cm-2. The Tafel slope for HER on salt-sealed Mo2C is 88 mV·dec-1. This can be considered as the proof of the Volmer-Heyrovsky mechanism with electrochem. desorption as the rate-determining step. In the experiment, the researchers used 2,6-Diaminopyridine(cas: 141-86-6Quality Control of 2,6-Diaminopyridine)

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.Quality Control of 2,6-Diaminopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Cation-Directed Self-Assembly of Macrocyclic Diacetylene for Developing Chromogenic Polydiacetylene》 were Shin, Geon; Khazi, Mohammed Iqbal; Kundapur, Umesha; Kim, Bubsung; Kim, Youngmee; Lee, Chan Woo; Kim, Jong-Man. And the article was published in ACS Macro Letters in 2019. Computed Properties of C5H7N3 The author mentioned the following in the article:

The cation-directed self-assembly process has emerged as a fascinating approach for constructing supramol. architectures and manifested a diverse range of assembly related applications. Herein, we synthesized a macrocyclic structure containing bis-amidopyridine and photopolymerizable diacetylene template, PyMCDA. Owing to the metal coordination affinity of bis-amidopyridine and the π-π stacking characteristic of diacetylene template and complementary to the cyclic mol. framework, Cs+-directed organic nanotubes are generated via unidirectional self-assembly of PyMCDA. The monomeric PyMCDA nanotubes are transformed into the covalently crosslinked chromogenic polydiacetylene nanotubes (PyMCPDA-Cs+) by UV-promoted topochem. polymerization The result of a metal-ligand coordination characteristic, geometric parameters in solid-state assemblies, and topochem. polymerization behavior reveals a generation of Cs+ ion inserted nanotubes. Interestingly, PyMCDA-Cs+ nanotubes display thermochromic property with a brilliant blue-to-red color transition. In the experimental materials used by the author, we found 2,6-Diaminopyridine(cas: 141-86-6Computed Properties of C5H7N3)

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.Computed Properties of C5H7N3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《A nature-inspired design yields a new class of steroids against trypanosomatids》 were Aguilera, Elena; Perdomo, Cintya; Espindola, Alejandra; Corvo, Ileana; Faral-Tello, Paula; Robello, Carlos; Serna, Elva; Benitez, Fatima; Riveros, Rocio; Torres, Susana; Vera de Bilbao, Ninfa I.; Yaluff, Gloria; Alvarez, Guzman. And the article was published in Molecules in 2019. COA of Formula: C6H4BrNO The author mentioned the following in the article:

Chagas disease and Leishmaniasis are neglected endemic protozoan diseases recognized as public health problems by the World Health Organization. These diseases affect millions of people around the world however, efficient and low-cost treatments are not available. Different steroid mols. with antimicrobial and antiparasitic activity were isolated from diverse organisms (ticks, plants, fungi). These mols. have complex structures that make de novo synthesis extremely difficult. In this work, we designed new and simpler compounds with antiparasitic potential inspired in natural steroids and synthesized a series of nineteen steroidal arylideneketones and thiazolidenehydrazines. We explored their biol. activity against Leishmania infantum, Leishmania amazonensis, and Trypanosoma cruzi in vitro and in vivo. We also assayed their genotoxicity and acute toxicity in vitro and in mice. The best compound, a steroidal thiosemicarbazone compound 8 (ID_1260) was active in vitro (IC50 200 nM) and in vivo (60% infection reduction at 50 mg/kg) in Leishmania and T. cruzi. It also has low toxicity in vitro and in vivo (LD50 >2000 mg/kg) and no genotoxic effects, being a promising compound for anti-trypanosomatid drug development. The results came from multiple reactions, including the reaction of 2-Bromonicotinaldehyde(cas: 128071-75-0COA of Formula: C6H4BrNO)

2-Bromonicotinaldehyde(cas: 128071-75-0) 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.COA of Formula: C6H4BrNO

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Iron-Catalyzed Borrowing Hydrogen β-C(sp3)-Methylation of Alcohols》 were Polidano, Kurt; Williams, Jonathan M. J.; Morrill, Louis C.. And the article was published in ACS Catalysis in 2019. Application In Synthesis of 2-(2-Hydroxyethyl)pyridine The author mentioned the following in the article:

Herein we report the iron-catalyzed β-C(sp3)-methylation of primary alcs. using methanol as a C1 building block. This borrowing hydrogen approach employs a well-defined bench-stable (cyclopentadienone)iron(0) carbonyl complex as precatalyst (5 mol %) and enables a diverse selection of substituted 2-arylethanols to undergo β-C(sp3)-methylation in good isolated yields (24 examples, 65% average yield). In addition to this study using 2-(2-Hydroxyethyl)pyridine, there are many other studies that have used 2-(2-Hydroxyethyl)pyridine(cas: 103-74-2Application In Synthesis of 2-(2-Hydroxyethyl)pyridine) was used in this study.

2-(2-Hydroxyethyl)pyridine(cas: 103-74-2) 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.Application In Synthesis of 2-(2-Hydroxyethyl)pyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Palladium-catalyzed carbonylative synthesis of indoloisoindoloquinazolinone derivatives by using CO as a carbonyl source》 were Guo, Shenghai; Wang, Fang; Liu, Yangfan; Fan, Xuesen. And the article was published in Tetrahedron in 2019. Application In Synthesis of 2-Bromonicotinaldehyde The author mentioned the following in the article:

An efficient synthesis of indolo[1,2-c]isoindolo[2,1-a]quinazolin-5(16aH)-one derivatives through palladium-catalyzed cyclocarbonylation reaction of 6-(2-bromoaryl)-5,6-dihydroindolo[1,2-c]quinazolines with the use of CO as a carbonyl source under atm. pressure has been disclosed. More intriguingly, the above-mentioned products can also be obtained directly from a one-pot two-step tandem reaction of 2-(1H-indol-2-yl)anilines and 2-bromobenzaldehydes, which are the precursors of 6-(2-bromoaryl)-5,6-dihydroindolo[1,2-c]quinazolines, under an atm. CO pressure in modest yields. In the part of experimental materials, we found many familiar compounds, such as 2-Bromonicotinaldehyde(cas: 128071-75-0Application In Synthesis of 2-Bromonicotinaldehyde)

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

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Organic Letters included an article by Bettoni, Leo; Gaillard, Sylvain; Renaud, Jean-Luc. Application In Synthesis of 2-(2-Hydroxyethyl)pyridine. The article was titled 《Iron-Catalyzed β-Alkylation of Alcohols》. The information in the text is summarized as follows:

β-Branched alkylated alcs. have been prepared in good yields using a double-hydrogen auto-transfer strategy in the presence of our diaminocyclopentadienone iron tricarbonyl complex Fe1. The alkylation of some 2-arylethanol derivatives was successfully addressed with benzylic alcs. and methanol as alkylating reagents under mild conditions. Deuterium labeling experiments suggested that both alcs. (2-arylethanol and either methanol or benzyl alc.) served as hydrogen donors in this cascade process.2-(2-Hydroxyethyl)pyridine(cas: 103-74-2Application In Synthesis of 2-(2-Hydroxyethyl)pyridine) was used in this study.

2-(2-Hydroxyethyl)pyridine(cas: 103-74-2) 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.Application In Synthesis of 2-(2-Hydroxyethyl)pyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,CrystEngComm included an article by Torubaev, Y. V.; Skabitsky, I. V.. Application In Synthesis of 4-Cyanopyridine. The article was titled 《The energy frameworks of Aufbau synthon modules in 4-cyanopyridine co-crystals》. The information in the text is summarized as follows:

The supramol. arrangement of 4-cyanopyridine (4CNpy) in its native crystal form and its co-crystals with halogen bond (XB) donors is discussed in terms of long-range synthon Aufbau modules (LSAMs) and energy frameworks. Dissociations of 2D zigzag chains of parent 4CNpy into 1D dimers observed in its co-crystals are in good agreement with the Aufbau model. Its co-formers, XB donors 1,4-I2(CF2)4, C2I2, 1,3- and 1,4-I2C6F4 (m- and p-DITFB), provide equal energy of I···N XBs, but perfluorinated iodo-alkane 1,4-I2(CF2)4 and diiodoacetylene C2I2 cannot achieve the same strength of homomol. aggregation as π-π stacking in columnar DITFB modules. As a result, DITFBs form I···N XBs with both Npy and NCN nitrogen atoms of 4CNpy, while 1,4-I2(CF2)4 and C2I2 only with the Npy atom. This is not a particular case of 4CNpy co-crystals, but in general, DITFB appears to be a more effective XB donor co-former than C2I2, 1,4-I2(CF2)n and other iodo-XB donors, which has similar potential to an iodine atom but lacks homomol. aggregation. In supramol. reactions of p-DITFB with (η6-Ar)RuX2(4CNpy) (Ar = p-cymene, X = Cl, I) bearing Npy-coordinated 4CNpy, the former gives definite preference to the XBs with the halogen atoms, but not to the CN group of the 4CNpy ligand. In the experimental materials used by the author, we found 4-Cyanopyridine(cas: 100-48-1Application In Synthesis of 4-Cyanopyridine)

4-Cyanopyridine(cas: 100-48-1) 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 In Synthesis of 4-Cyanopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Organic Letters included an article by Chen, Yiyang; Lu, Ping; Wang, Yanguang. Application of 100-48-1. The article was titled 《3-Amino-fluorene-2,4-dicarbonitriles (AFDCs) as Photocatalysts for the Decarboxylative Arylation of α-Amino Acids and α-Oxy Acids with Arylnitriles》. The information in the text is summarized as follows:

1-(4-(9H-Carbazol-9-yl)phenyl)-3-amino-9H-fluorene-2,4-dicarbonitrile as a new photocatalyst for the decarboxylative cross-coupling reaction of α-amino acids or α-oxy carboxylic acids with arylnitriles is described. This light-driven reaction enables a variety of benzylic amines and ethers to be prepared from readily available starting materials under mild conditions. In addition to this study using 4-Cyanopyridine, there are many other studies that have used 4-Cyanopyridine(cas: 100-48-1Application of 100-48-1) was used in this study.

4-Cyanopyridine(cas: 100-48-1) 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.Application of 100-48-1

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Synlett included an article by Schneekoenig, Jacob; Junge, Kathrin; Beller, Matthias. Recommanded Product: 4-Acetylpyridine. The article was titled 《Manganese Catalyzed Asymmetric Transfer Hydrogenation of Ketones Using Chiral Oxamide Ligands》. The information in the text is summarized as follows:

The asym. transfer hydrogenation of ketones using iso-Pr alc. (IPA) as hydrogen donor in the presence of novel manganese catalysts is explored. The selective and active systems are easily generated in situ from [MnBr(CO)5] and inexpensive C2-sym. bisoxalamide ligands. Under the optimized reaction conditions, the Mn-derived catalyst gave higher enantioselectivity compared with the related ruthenium catalyst. In the experimental materials used by the author, we found 4-Acetylpyridine(cas: 1122-54-9Recommanded Product: 4-Acetylpyridine)

4-Acetylpyridine(cas: 1122-54-9) 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.Recommanded Product: 4-Acetylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2018,Hu, Li-Qun; Deng, Rong-Li; Li, Yan-Fen; Zeng, Cui-Jin; Shen, Dong-Sheng; Liu, Feng-Shou published 《Developing Bis(imino)acenaphthene-Supported N-Heterocyclic Carbene Palladium Precatalysts for Direct Arylation of Azoles》.Organometallics published the findings.Category: pyridine-derivatives The information in the text is summarized as follows:

From the strategy of developing highly efficient protocol for Pd-catalyzed cross-coupling reactions, bulky bis(imino)acenaphthene (BIAN)-supported Pd-PEPPSI complexes were synthesized, characterized and applied in direct arylation of azoles. The effect of backbone and N-moieties on NHCs was evaluated and the reaction conditions were optimized. The bulky Pd-PEPPSI complexes could be successfully employed in cross-coupling of (hetero)aryl bromides with azoles at a low Pd loading of 0.5-0.05 mol% under aerobic conditions, demonstrating the ease of manipulation without glovebox and handling of solvents. In the experiment, the researchers used many compounds, for example, 5-Bromo-2-chloropyridine(cas: 53939-30-3Category: pyridine-derivatives)

5-Bromo-2-chloropyridine(cas: 53939-30-3) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem