Tag: M.W=150-200

Yamada, Masanori published the artcileProton conductivity of zwitterionic-type molecular solids under intermediate temperature and anhydrous conditions, HPLC of Formula: 636-73-7, the publication is Chemical Physics Letters (2005), 402(4-6), 324-328, database is CAplus.

Anhydrous proton conducting material for polymer electrolyte membrane fuel cell (PEFC) was prepared by the mixing of zwitterionic-type mol. solid 3-pyridinesulfonic acid (PS) and organic acid methylenediphosphonic acid (MP). As a result, PS mol., which has a sulfonic acid and a pyridine group in its structure, showed the proton conductivity of 4 × 10^-5 S cm^-1 at 160°C under anhydrous condition. Surprisingly, by the mixing of MP to PS material, the PS-MP composite material exhibited a conductivity of 2 × 10^-3 S cm^-1. Also, the conductivity of PS-MP composite material did not decrease under the heating at 160° for 50 h.

Chemical Physics Letters published new progress about 636-73-7. 636-73-7 belongs to pyridine-derivatives, auxiliary class Pyridine,Sulfonic acid, name is Pyridine-3-sulfonic acid, and the molecular formula is C11H14O4, HPLC of Formula: 636-73-7.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Renaud, Justin B. published the artcileNormalization of LC-MS mycotoxin determination using the N-alkylpyridinium-3-sulfonates (NAPS) retention index system, Category: pyridine-derivatives, the publication is Journal of Chromatography A (2021), 461901, database is CAplus and MEDLINE.

A major challenge for LC-MS anal. is the ability to compare data between laboratories and across instrument platforms. Currently, mycotoxin determination relies on dereplication strategies based on physicochem. properties such as the m/z of the precursor and product ions. Unlike these intrinsic properties, retention time (tR) is an extrinsic property impacted by LC conditions, including mobile phases and column chem., making exchange of data between groups difficult. To address this, we are introducing the concept of incorporating an electrospray compatible, retention index (RI) system based on a series of N-alkylpyridinium-3-sulfonates (NAPS) into routine mycotoxin determination These standards of differing alkyl chain length span RI units from 100 to 2000, are UV active and have fixed pos. and neg. charges for electrospray ionization in either mode. Using high resolution LC-MS/MS, the RIs of 96 mycotoxins and fungal secondary metabolites were normalized as a proof of concept with the NAPS RI system under multiple pH, column and gradient chromatog. conditions. This method was then applied to the anal. of a crude extract of Penicillium roqueforti, where we were able to decrease the number of false positives by implementing an RI filter as well as a secondary correction factor. Addnl., we developed software that allows users to convert published RIs to a predicted tR values. Integration of the NAPS RI system into routine LC-MS anal. will improve compound identifications and help facilitate ease of data sharing.

Journal of Chromatography A published new progress about 636-73-7. 636-73-7 belongs to pyridine-derivatives, auxiliary class Pyridine,Sulfonic acid, name is Pyridine-3-sulfonic acid, and the molecular formula is C5H5NO3S, Category: pyridine-derivatives.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Hoque, Emdadul Md published the artcileRemarkably Efficient Iridium Catalysts for Directed C(sp²)-H and C(sp³)-H Borylation of Diverse Classes of Substrates, Recommanded Product: 5-Methyl-2-(p-tolyl)pyridine, the publication is Journal of the American Chemical Society (2021), 143(13), 5022-5037, database is CAplus and MEDLINE.

Here we describe the discovery of a new class of C-H borylation catalysts and their use for regioselective C-H borylation of aromatic, heteroaromatic, and aliphatic systems. The new catalysts have Ir-C(thienyl) or Ir-C(furyl) anionic ligands instead of the diamine-type neutral chelating ligands used in the standard C-H borylation conditions. It is reported that the employment of these newly discovered catalysts show excellent reactivity and ortho-selectivity for diverse classes of aromatic substrates with high isolated yields. Moreover, the catalysts proved to be efficient for a wide number of aliphatic substrates for selective C(sp³)-H bond borylations. Heterocyclic mols. are selectively borylated using the inherently elevated reactivity of the C-H bonds. A number of late-stage C-H functionalization have been described using the same catalysts. Furthermore, we show that one of the catalysts could be used even in open air for the C(sp²)-H and C(sp³)-H borylations enabling the method more general. Preliminary mechanistic studies suggest that the active catalytic intermediate is the Ir(bis)boryl complex, and the attached ligand acts as bidentate ligand. Collectively, this study underlines the discovery of new class of C-H borylation catalysts that should find wide application in the context of C-H functionalization chem.

Journal of the American Chemical Society published new progress about 85237-71-4. 85237-71-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is 5-Methyl-2-(p-tolyl)pyridine, and the molecular formula is C13H13N, Recommanded Product: 5-Methyl-2-(p-tolyl)pyridine.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Jafarpour, Farnaz published the artcilePalladium-catalyzed chelation-assisted C-H bond halogenation: selective chlorination of 2-arylpyridines with acid chlorides, SDS of cas: 85237-71-4, the publication is Synthesis (2014), 46(9), 1224-1228, 5 pp., database is CAplus.

Palladium-catalyzed chelation-assisted C-H bond halogenation of arenes using acid chlorides as chlorinating agents is reported. E.g., in presence of PdCl₂ and CuCl₂ in 1,4-dioxane at 140 °C, regioselective chlorination of 2-phenylpyridine by PhCOCl gave 92% I. This method provides a monoselective, straightforward, and clean route for the construction of aryl chlorides as privileged motifs in organic transformations.

Synthesis published new progress about 85237-71-4. 85237-71-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is 5-Methyl-2-(p-tolyl)pyridine, and the molecular formula is C13H13N, SDS of cas: 85237-71-4.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Garai, Rabindranath published the artcileTriple Passivation Approach to Laminate Perovskite Layers for Augmented UV and Ambient Stable Photovoltaics, Recommanded Product: Phenyl(pyridin-2-yl)methanone, the publication is ACS Applied Energy Materials (2022), 5(3), 3392-3400, database is CAplus.

The instability of the perovskite solar cells (PSCs) toward UV irradiation and moisture is a limiting factor in terms of commercialization even after achieving excellent power conversion efficiencies (PCEs). Herein, an advanced triple passivation technique has been strategically designed and demonstrated utilizing UV-absorbing 2-benzoylpyridine (BP) mols. as a passivation additive to laminate perovskites and improve PSC stability. Double layers of BP were coated on both sides of the perovskite layer, and the mol. was also incorporated into the precursor solution This strategy significantly improved the perovskite crystallinity and film quality, lowered the recombination, and enhanced the carrier transport in the PSC. The triple-passivated device exhibited a high PCE of 20.46% with almost negligible hysteresis. Further, passivated large-area (2.5 cm²) devices were also fabricated that demonstrated a PCE of 18.61%. Moreover, the triple passivation approach exhibited impressive UV and ambient stability because it can effectively shield the perovskite layer from UV illumination and moisture.

ACS Applied Energy Materials published new progress about 91-02-1. 91-02-1 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene,Ketone, name is Phenyl(pyridin-2-yl)methanone, and the molecular formula is C12H9NO, Recommanded Product: Phenyl(pyridin-2-yl)methanone.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Qu, Bo published the artcileChelation controlled reductive amination of cyclic ketones to trans-4-methoxycyclohexylamines: 9-BBN reduction mediated with FeCl₃, Application of 2-Bromopyridin-3-amine, the publication is Tetrahedron Letters (2012), 53(15), 1982-1986, database is CAplus.

A novel trans-diastereoselective reductive amination of 4-substituted cyclohexanones is described using 9-BBN as reducing agent in the presence of FeCl₃. The method permits efficient synthesis of structurally diverse 4-trans-alkoxycyclohexylamines.

Tetrahedron Letters published new progress about 39856-58-1. 39856-58-1 belongs to pyridine-derivatives, auxiliary class Pyridine,Bromide,Amine, name is 2-Bromopyridin-3-amine, and the molecular formula is C5H5BrN2, Application of 2-Bromopyridin-3-amine.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Lawson, Marie published the artcileAn efficient coupling of N-tosylhydrazones with 2-halopyridines: synthesis of 2-α-styrylpyridines endowed with antitumor activity, SDS of cas: 39856-58-1, the publication is Organic & Biomolecular Chemistry (2013), 11(22), 3664-3673, database is CAplus and MEDLINE.

The synthesis of 2-α-styrylpyridines has been carried out by using the coupling of polyoxygenated N-tosylhydrazones with various 2-halopyridines. We demonstrated that the use of a catalytic amount of PdCl₂(MeCN)₂ in combination with a bidentate ferrocene DPPF or a monodentate alkyl phosphine ^tBu₂MeP-HBF₄ constitutes an efficient protocol for this coupling, providing 2-α-styrylpyridines in satisfactory to good yields. Among evaluated, compound I was found to exhibit excellent antiproliferative and antimitotic activities comparable to that of the reference compound isoCA-4.

Organic & Biomolecular Chemistry published new progress about 39856-58-1. 39856-58-1 belongs to pyridine-derivatives, auxiliary class Pyridine,Bromide,Amine, name is 2-Bromopyridin-3-amine, and the molecular formula is C5H5BrN2, SDS of cas: 39856-58-1.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Liu, Shan-Shan published the artcileSulfonic Groups Lined along Channels of Metal-Organic Frameworks (MOFs) for Super-Proton Conductor, Computed Properties of 636-73-7, the publication is Inorganic Chemistry (2020), 59(1), 396-402, database is CAplus and MEDLINE.

Designing high-performance proton-conducting metal-organic frameworks simultaneously having highly hydrothermal stability and a high-d. proton carrier remains a great challenge. Fe-MIL-88B is a classic metal-organic framework (MOF) with a large-size one-dimensional (1D) channel lined with a high-d. uncoordinated metal atom for postfunctionalization; however this MOF cannot act as a proton conductor due to the weak hydrothermal stability. Here, we prepared an ultrastable isostructure Cr-MIL-88B, which is subsequently functionalized by anchoring 3-pyridinesulfonic acid and 2-(4-pyridyl) ethanesulfonic acid on the naked Cr atoms exposed on the surface of the host-framework, producing two new MOFs, i.e. Cr-MIL-88B-pyridine sulfonic acid (abbreviated as Cr-MIL-88B-PSA) and Cr-MIL-88B-pyridine ethanesulfonic acid (abbreviated as Cr-MIL-88B-PESA). Thus, Cr atoms on the host framework were modified by functional sulfonic groups, which stick out toward the center of the channel forming ordered high-d. sulfonic groups as proton donors along the open channel and achieving the highest proton conductivity of 4.50 × 10^-2 S cm^-1 for Cr-MIL-88B-PESA and 1.58 × 10^-1 S cm^-1 for Cr-MIL-88B-PSA, surpassing that of the Nafion membrane.

Inorganic Chemistry published new progress about 636-73-7. 636-73-7 belongs to pyridine-derivatives, auxiliary class Pyridine,Sulfonic acid, name is Pyridine-3-sulfonic acid, and the molecular formula is C5H5NO3S, Computed Properties of 636-73-7.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Burns, D. Thorburn published the artcileSpectrophotometric or spectrofluorimetric determination of cobalt in steels by extraction as bis[1-(2-pyridylmethylene)-2-(2-pyridyl)hydrazine]cobalt(III) dimethoxyanthracenesulfonate, Synthetic Route of 2215-33-0, the publication is Analytica Chimica Acta (1983), 151(1), 245-9, database is CAplus.

The steel sample was dissolved and Co was reacted with 1-(2-pyridylmethylene)-2-(2-pyridyl)hydrazine (PAPY) and dimethoxyanthracenesulfonate (DMAS) at pH 3 to form an ion-pair complex. The latter was extracted into 1:9 Me₂CO-1,2-dichloroethane. The absorbance and fluorescence of the organic phase was measured at 496 nm and 450 nm (λ_exc = 396 nm), resp. Beer’s law was obeyed for 0-5 μg Co/10 mL. The relative standard deviation was 1.3 and 1.5% for the spectrophotometric and fluorometric, resp., determination of 4 μg Co. The molar absorptivity of the Co(PAPY)₂DMAS ion-pair complex was 3.23 × 10⁴. The detection limit was 0.003 and 0.004 μg Co/mL for the spectrophotometric and fluorometric determination, resp. The effect of diverse ions was studied.

Analytica Chimica Acta published new progress about 2215-33-0. 2215-33-0 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, and the molecular formula is C11H10N4, Synthetic Route of 2215-33-0.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Yu, Tao published the artcilePoly(ethylene glycol) dimethyl ether mediated oxidative scission of aromatic olefins to carbonyl compounds by molecular oxygen, Recommanded Product: Phenyl(pyridin-2-yl)methanone, the publication is RSC Advances (2021), 11(23), 13848-13852, database is CAplus and MEDLINE.

A simple and practical oxidative scission of aromatic olefins to carbonyl compounds R¹C(O)R₂ [R¹ = Ph, 4-MeC₆H₄, 4-FC₆H₄, etc., R² = Ph, 4-MeOC₆H₄, 4-ClC₆H₄, ect.] using O₂ as the sole oxidant with poly(ethylene glycol) di-Me ether as a benign solvent was developed. A wide range of monosubstituted, gem-disubstituted, 1,2-disubstituted, trisubstituted and tetrasubstituted aromatic olefins was successfully converted into the corresponding aldehydes and ketones in excellent yields even with gram-scale reaction. Some control experiments were also conducted to support a possible reaction pathway.

RSC Advances published new progress about 91-02-1. 91-02-1 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene,Ketone, name is Phenyl(pyridin-2-yl)methanone, and the molecular formula is C6H5NO, Recommanded Product: Phenyl(pyridin-2-yl)methanone.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem