Month: October 2022

《Electrochemical Synthesis of Hindered Primary and Secondary Amines via Proton-Coupled Electron Transfer》 was written by Lehnherr, Dan; Lam, Yu-hong; Nicastri, Michael C.; Liu, Jinchu; Newman, Justin A.; Regalado, Erik L.; DiRocco, Daniel A.; Rovis, Tomislav. SDS of cas: 100-48-1 And the article was included in Journal of the American Chemical Society in 2020. The article conveys some information:

Accessing hindered amines, particularly primary amines α to a fully substituted carbon center, is synthetically challenging. We report an electrochem. method to access such hindered amines starting from benchtop-stable iminium salts and cyanoheteroarenes. A wide variety of substituted heterocycles (pyridine, pyrimidine, pyrazine, purine, azaindole) can be utilized in the cross-coupling reaction, including those substituted with a halide, trifluoromethyl, ester, amide, or ether group, a heterocycle, or an unprotected alc. or alkyne. Mechanistic insight based on DFT data, as well as cyclic voltammetry and NMR spectroscopy, suggests that a proton-coupled electron-transfer mechanism is operational as part of a hetero-biradical cross-coupling of α-amino radicals and radicals derived from cyanoheteroarenes. Safety: cyanide may be released as a byproduct leading to release of toxic HCN. In addition to this study using 4-Cyanopyridine, there are many other studies that have used 4-Cyanopyridine(cas: 100-48-1SDS of cas: 100-48-1) was used in this study.

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

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Direct Femtosecond Laser Printing of Silk Fibroin Microstructures》 was written by Santos, Moliria V.; Paula, Kelly T.; de Andrade, Marcelo B.; Gomes, Emmanuel M.; Marques, Lippy F.; Ribeiro, Sidney J. L.; Mendonca, Cleber R.. Application In Synthesis of 4,4′-Dimethyl-2,2′-bipyridine And the article was included in ACS Applied Materials & Interfaces in 2020. The article conveys some information:

Fabrication of functional silk fibroin microstructures has extensive applications in biotechnol. and photonics. Considerable progress has been made based on lithog. methods and self-assembly approaches. However, most methods require chem. modification of silk fibroin, which restricts the functionalities of the designed materials. At the same time, femtosecond laser-induced forward transfer (fs-LIFT) has been explored as a simple and attractive processing tool for microprinting of high-resolution structures. The authors propose the use of LIFT with fs-pulses for creating high-resolution structures of regenerated silk fibroin (SF). Furthermore, upon adding Eu3+/Tb3+ complexes to SF, the authors have been able to demonstrate the printing by LIFT of luminescent SF structures with a resolution ∼2μm and without material degradation This approach provides a facile method for printing well-defined two-dimensional (2D) micropatterns of pure and functionalized SF, which can be used in a wide range of optical and biomedical applications. In the experiment, the researchers used many compounds, for example, 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Application In Synthesis of 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.Application In Synthesis of 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

《An Insight into the Kinetics and Mechanism of Oxidation of Tris(4,4′-dimethyl-2,2′-bipyridine)iron(II) by Bromate》 was written by Shazia Summer; Shamim, Afshan; Khattak, Rozina; Qamar, Noshab; Naqvi, Iftikhar Imam. Quality Control of 4,4′-Dimethyl-2,2′-bipyridine And the article was included in Russian Journal of Physical Chemistry A in 2020. The article conveys some information:

Kinetic investigation of oxidation of tris(4,4′-dimethyl, 2,2′-bipyridine)iron(II) by bromate has been undertaken. The redox reaction between [Fe(dmbpy)3]2+ and bromate ion (BrO-3) was monitored spectrophotometrically under the pseudo-first order condition i.e.[BrO-3] ≫ [Fe(dmbpy)3]2+. Kinetic data revealed that the pseudo first order rate constant (kobs) is independent of the concentration of [Fe(dmbpy)3]2+. Though, when concentration of bromate ion is increased in reaction mixture at fixed pH, the rate also increases up to the saturation point at higher concentrations, indicating a precursor complex formation and an outer-sphere mechanism. The influence of accelerating [H+] and ionic strength on reaction rate were also investigated. The increasing values of the rate constant at low pH mention the involvement of protonated bromate species (HBrO3 and H2BrO+3) in the rate-determining step. However, a rise in the value of the rate constant with increasing ionic strength implies the diprotonated species, H2BrO+3, as the reactive species. On the basis of these conclusions, we were able to postulate the appropriate mechanism and the rate law of this redox reaction. The experimental part of the paper was very detailed, including the reaction process of 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Quality Control of 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.Quality Control of 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

《Oxadiazole-functionalized fibers for selective adsorption of Hg2+》 was written by Du, Huimin; Xie, Yujia; Zhang, Haonan; Chima, Anyaegbu; Tao, Minli; Zhang, Wenqin. Recommanded Product: 103-74-2 And the article was included in Industrial & Engineering Chemistry Research in 2020. The article conveys some information:

Six kinds of 1,3,4-oxadiazole-functionalized fibers were prepared to evaluate the adsorption capacity for Hg2+. Finally, a functionalized fiber (PANp-PMODF) with the best adsorption performance was selected for further research. The PANp-PMODF fiber was characterized by IR (IR), elemental anal. (EA), SEM (SEM), X-ray diffraction (XRD), and XPS. The PANp-PMODF shows excellent selectivity for mercury ions in a mixed heavy metal ion solution (Hg2+, Ni2+, Pb2+, Zn2+, Ag+, Co2+, Cr3+, Cu2+, and Cd2+), and it can reduce the concentration of Hg2+ to 44 ppb in the actual sewage, which is of great practical value for the treatment of mercury pollution. Furthermore, the adsorbed Hg2+ can be desorbed completely by dilute HNO3 and the PANp-PMODF can be reused many times with excellent recyclability. In the experiment, the researchers used many compounds, for example, 2-(2-Hydroxyethyl)pyridine(cas: 103-74-2Recommanded Product: 103-74-2)

2-(2-Hydroxyethyl)pyridine(cas: 103-74-2) 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.Recommanded Product: 103-74-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《The laser-induced potential jump: A method for rapid electron injection into oxidoreductase enzymes》 was written by Sanchez, Monica L. K.; Konecny, Sara E.; Narehood, Sarah M.; Reijerse, Edward J.; Lubitz, Wolfgang; Birrell, James A.; Dyer, R. Brian. Application of 1134-35-6 And the article was included in Journal of Physical Chemistry B in 2020. The article conveys some information:

Oxidoreductase enzymes often perform technol. useful chem. transformations using abundant metal cofactors with high efficiency under ambient conditions. The understanding of the catalytic mechanism of these enzymes is, however, highly dependent on the availability of well-characterized and optimized time-resolved anal. techniques. We have developed an approach for rapidly injecting electrons into a catalytic system using a photoactivated nanomaterial in combination with a range of redox mediators to produce a potential jump in solution, which then initiates turnover via electron transfer (ET) to the catalyst. The ET events at the nanomaterial-mediator-catalyst interfaces are, however, highly sensitive to the exptl. conditions such as photon flux, relative concentrations of system components, and pH. Here, we present a systematic optimization of these exptl. parameters for a specific catalytic system, namely, [FeFe] hydrogenase from Chlamydomonas reinhardtii (CrHydA1). The developed strategies can, however, be applied in the study of a wide variety of oxidoreductase enzymes. Our potential jump system consists of CdSe/CdS core-shell nanorods as a photosensitizer and a series of substituted bipyridinium salts as mediators with redox potentials in the range from -550 to -670 mV (vs. SHE). With these components, we screened the effect of pH, mediator concentration, protein concentration, photosensitizer concentration, and photon flux on steady-state photoreduction and hydrogen production as well as ET and potential jump efficiency. By manipulating these exptl. conditions, we show the potential of simple modifications to improve the tunability of the potential jump for application to study oxidoreductases. After reading the article, we found that the author used 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Application of 1134-35-6)

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.Application of 1134-35-6 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

《A Coordinative Dendrimer Achieves Excellent Efficiency in Cytosolic Protein and Peptide Delivery》 was written by Ren, Lanfang; Lv, Jia; Wang, Hui; Cheng, Yiyun. Product Details of 1539-42-0 And the article was included in Angewandte Chemie, International Edition in 2020. The article conveys some information:

Cytosolic protein delivery is a prerequisite for the development of protein therapeutics that act on intracellular targets. Proteins are generally membrane-impermeable and thus need a carrier such as a polymer to facilitate their internalization. However, the efficient binding of proteins with different isoelec. points to polymeric carriers is challenging. In this study, we designed a coordinative dendrimer to solve this problem. The dendrimers modified with dipicolylamine/zinc(II) complex were capable of binding proteins through a combination of ionic and coordination interactions. The best polymer efficiently delivered 30 cargo proteins and peptides into the cytosol, while maintaining their bioactivity after intracellular release. The removal or replacement of zinc ions in the polymer with other transition-metal ions lead to significantly decreased efficiency in cytosolic protein delivery. This study provides a new strategy to develop robust and efficient polymers for cytosolic protein delivery. The experimental part of the paper was very detailed, including the reaction process of Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Product Details of 1539-42-0)

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.Product Details of 1539-42-0

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Visible-Light-Induced ortho-Selective Migration on Pyridyl Ring: Trifluoromethylative Pyridylation of Unactivated Alkenes》 was written by Jeon, Jinwon; He, Yu-Tao; Shin, Sanghoon; Hong, Sungwoo. Category: pyridine-derivatives And the article was included in Angewandte Chemie, International Edition in 2020. The article conveys some information:

The photocatalyzed ortho-selective migration on a pyridyl ring has been achieved for the site-selective trifluoromethylative pyridylation of unactivated alkenes. The overall process was initiated by the selective addition of a CF3 radical to the alkene moiety of N-(alkenyloxy)pyridinium salts I [X = O, Z = (CH2)3, R1 = H, 2-Me, 3-MeO2C, 4-Ph, etc., R2 = H, Me; X = O, Z = CH2, CH2CH2, (CH2)4, R1 = 4-MeO2C, R2 = H; X = NTs, Z = CH2, CH2CH2, R1 = H, 4-MeO2C, R2 = H; etc.] to provide a nucleophilic alkyl radical intermediate, which enabled an intramol. endo addition exclusively to the ortho-position of the pyridinium salt to afford the corresponding functionalized pyridines II. Both secondary and tertiary alkyl radicals were well-suited for addition to the C2-position of pyridinium salts to ultimately provide synthetically valuable C2-fluoroalkyl functionalized pyridines. Moreover, the method was successfully applied to the reaction with P-centered radicals. The utility of this transformation was further demonstrated by the late-stage functionalization of complex bioactive mols. After reading the article, we found that the author used 4-Acetylpyridine(cas: 1122-54-9Category: pyridine-derivatives)

4-Acetylpyridine(cas: 1122-54-9) 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. Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Liu, Yan-Hua; Xie, Pei-Pei; Liu, Lei; Fan, Jun; Zhang, Zhuo-Zhuo; Hong, Xin; Shi, Bing-Feng published their research in Journal of the American Chemical Society in 2021. The article was titled 《Cp*Co(III)-Catalyzed Enantioselective Hydroarylation of Unactivated Terminal Alkenes via C-H Activation》.Application of 3510-66-5 The article contains the following contents:

Enantioselective hydroarylation of unactivated terminal alkenes RCH=CH2 (R = n-hexyl, benzyl, cyclohexylmethyl, etc.) constitutes a prominent challenge in organic chem. Synthesis of Cp*Co(III)-catalyzed asym. hydroarylation of unactivated aliphatic terminal alkenes assisted by a new type of tailor-made amino acid ligands. Critical to the chiral induction was the engaging of a novel noncovalent interaction (NCI), which has seldomly been disclosed in C-H activation area, arising from the mol. recognition among the organocobalt(III) intermediate, the coordinated alkene and the well-designed chiral ligand. A broad range of C2 alkylated indoles were obtained in high yields and excellent enantioselectivities. DFT calculations revealed the reaction mechanism and elucidated the origins of chiral induction in the stereodetermining alkene insertion step. The results came from multiple reactions, including the reaction of 2-Bromo-5-methylpyridine(cas: 3510-66-5Application of 3510-66-5)

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

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Lu, Fu-Dong; Lu, Liang-Qiu; He, Gui-Feng; Bai, Jun-Chuan; Xiao, Wen-Jing published their research in Journal of the American Chemical Society in 2021. The article was titled 《Enantioselective Radical Carbocyanation of 1,3-Dienes via Photocatalytic Generation of Allylcopper Complexes》.COA of Formula: C33H24IrN3 The article contains the following contents:

1,3-Dienes are readily available feedstocks that are widely used in the laboratory and industry. However, the potential of converting 1,3-dienes into value-added products, especially chiral products, has not yet been fully exploited. By synergetic photoredox/copper catalysis, we achieve the first visible-light-induced, enantioselective carbocyanation of 1,3-dienes by using carboxylic acid derivatives and trimethylsilyl cyanide. Under mild and neutral conditions, a diverse range of chiral allyl cyanides are produced in generally good efficiency and with high enantioselectivity from bench-stable and user-safe chems. Moreover, preliminary results also confirm that this success can be expanded to 1,3-enynes and the four-component carbonylative carbocyanation of 1,3-dienes and 1,3-enynes. In the experiment, the researchers used many compounds, for example, fac-Tris(2-phenylpyridine)iridium(cas: 94928-86-6COA of Formula: C33H24IrN3)

fac-Tris(2-phenylpyridine)iridium(cas: 94928-86-6) 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.COA of Formula: C33H24IrN3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Afsharnadery, Fatemeh; Khosravi, Kaveh; Zolfigol, Mohammad Ali published their research in Applied Organometallic Chemistry in 2021. The article was titled 《A novel magnetically recyclable semi-dendrimer catalyst-based ethanolpyridole supported on ferrite nanoparticles (HNPs@Py) for the synthesis of biscoumarin and dihydropyrano[3,2-c]chromene derivatives》.Synthetic Route of C7H9NO The article contains the following contents:

The novel organic-inorganic nanohybrid magnetic nanoparticles (HNPs@Py) were prepared by a simple method and characterized by FT-IR, XRD, FE-SEM, TGA, VSM, EDX, and MAP. The catalytic activity of this new (HNPs@Py) was studied for green synthesis of biscoumarins I (R = 4-Br, 3-NO2, 2-OH, etc.) and 3,4-dihydropyrano[c]chromene derivatives II (Ar = 2,4-dichlorophenyl, naphthalen-2-yl, 3-hydroxyphenyl). The short reaction time, high yields, simple workup, and easy separation of catalyst from the reaction mixture by an external magnetic field are the main advantages of the present protocol. In the experiment, the researchers used 2-(2-Hydroxyethyl)pyridine(cas: 103-74-2Synthetic Route of C7H9NO)

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.Synthetic Route of C7H9NO

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem