Category: 636-73-7

Schmuelling, Michael published the artcileTo what extent can the Pt-C bond of a metallacycle labilize the trans position? A temperature- and pressure-dependent mechanistic study, Product Details of C5H5NO3S, the publication is Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1972-1999) (1994), 1257-63, database is CAplus.

The orthoplatinated complexes [Pt{C₆H₃X(CH₂NMe₂)}(NC₅H₄SO₃-3)(H₂O)] (X = H 1a or 3-MeO 1b) were designed for mechanistic studies in H₂O. The aqua ligand is located trans to the Pt-C bond of the Ph group which lies in the Pt(II) coordination plane. The rates of substitution of the aqua ligand by nucleophiles (Nu) (Cl^–, Br^–, I^–, N₃^–, SCN^–, thiourea, N,N’-dimethylthiourea or N,N,N’,N’-tetramethylthiourea) were studied as a function of concentration, pH, temperature, and pressure by using a stopped-flow technique. The pK_a value of the aqua ligand in 1a is 9.75 ± 0.505 and the observed pseudo-first-order rate constants for the substitution reaction are given by k_obs = k₁[Nu] + k_-1. The k_-1 term arises from the reverse solvolysis reaction and is insignificant for stronger, S-donor nucleophiles. The values of k₁ are âˆ? orders of magnitude higher than the corresponding rate constants for anation reactions of [Pt(dien)(H₂O)]²⁺ (dien = diethylenetriamine) and close to the rate constants for anation of [Pd(dien)(H₂O)]²⁺. The effect is largely due to a strong decrease in ΔH^{â§?/sup>, ΔSâ§?/sup> and ΔVâ§?/sup>, clearly shows that the substantial rate increase is not associated with a changeover in mechanism and that the substitution process is still associative.}

Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1972-1999) 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, Product Details of C5H5NO3S.

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

Ramya, G. published the artcileInvestigations on pyridine-3-sulfonic acid doped polyaniline and polypyrrole: Metal loading through dopant molecules, Safety of Pyridine-3-sulfonic acid, the publication is Reactive & Functional Polymers (2008), 68(3), 701-709, database is CAplus.

Polyniline and polypyrrole were chem. and electrochem. synthesized in presence of pyridine-3-sulfonic acid. These conducting polymers were characterized by FT-IR, UV-vis, XRD, TGA and SEM techniques. Polyaniline showed a conductivity of 4 × 10^-4 S/cm while polypyrrole exhibited a conductivity of 6.2 × 10^-2 S/cm. The presence of pyridine ring in the dopant enabled the polymers to anchor Pd/or PdO through which the composite can work as catalytic material.

Reactive & Functional Polymers 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, Safety of Pyridine-3-sulfonic acid.

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

Panchaud, Philippe published the artcile3-Pyridinesulfonyl azide: A useful reagent for radical azidation, Name: Pyridine-3-sulfonic acid, the publication is Advanced Synthesis & Catalysis (2004), 346(8), 925-928, database is CAplus.

Radical azidations and carboazidations have been achieved using 3-pyridinesulfonyl azide as azidating agent. Due to its base properties and its polarity, the excess of reagent is readily removed at the end of the reaction by filtration through silica gel or by extraction with either aqueous 1M HCl or 1M CuSO₄. The use of this reagent greatly facilitates the tedious purifications of the final azides frequently encountered when reactions are run according to the original procedure involving benzenesulfonyl azide. Thus, reaction of Et 2-iodoacetate with 1-octene in presence of Bu₆Sn₂/di-tert-Bu hyponitrite/3-pyridinesulfonyl azide in C₆H₆ gave 80% Et 4-azidodecanoate.

Advanced Synthesis & Catalysis 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, Name: Pyridine-3-sulfonic acid.

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

Lombardini, J. B. published the artcileAnalogs of taurine as inhibitors of the phosphorylation of an �0 K molecular weight protein present in a mitochondrial fraction of the rat retina, SDS of cas: 636-73-7, the publication is Amino Acids (1997), 13(2), 115-130, database is CAplus.

It was previously demonstrated that taurine inhibits the phosphorylation of a â‰?0 K apparent mol. weight protein present in the mitochondrial fraction of the rat retina. Analogs of taurine were tested for their inhibitory activity on the phosphorylation of this 20 K protein. The most potent analogs were (±)trans-2-aminocyclopentanesulfonic acid (TAPS) and 1,2,3,4-tetrahydroquinoline-8-sulfonic acid (THQS), which were 21 and 7 times more potent than the parent compound, taurine, resp. Median-effect plots were used to calculate the inhibitory median effect and combination index values for the combined effects of taurine and taurine analogs. It was determined that the inhibitory taurine analogs were antagonistic to taurine when used in combination with taurine to inhibit the phosphorylation of the 20 K apparent mol. weight protein. It was concluded that the distance between the N and S atoms in the taurine structure was important for inhibitory activity. If the N atom was either within or attached to an unsaturated ring structure, the inhibitory potency was decreased. If both the S and N atoms were present within the ring structure, the analog has no activity.

Amino Acids 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, SDS of cas: 636-73-7.

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

Lombardini, John B. published the artcileEffects of kinase inhibitors and taurine analogs on the phosphorylation of specific proteins in mitochondrial fractions of rat heart and retina, SDS of cas: 636-73-7, the publication is Advances in Experimental Medicine and Biology (1996), 343-350, database is CAplus.

Quant. effects of various kinase inhibitors, specifically chelerythrine chloride, staurosporine, and W-7, and various taurine analogs (singly and in combination with taurine) on the phosphorylation of both the cardiac 44 kDa and retinal 20 kDa proteins are reported. Effects of the analogs on phosphorylation of both proteins suggest that the structural requirements for being either an inhibitor or stimulator are rather restricted.

Advances in Experimental Medicine and Biology 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, SDS of cas: 636-73-7.

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

Beier, Markus published the artcileNucleotides. Part 62. Pyridinium salts. An effective class of catalysts for oligonucleotide synthesis, Related Products of pyridine-derivatives, the publication is Helvetica Chimica Acta (1999), 82(6), 879-887, database is CAplus.

Various pyridinium salts were tested as catalysts for the condensation step in the phosphoramidite approach of oligonucleotide synthesis. Pyridinium chloride turned out to be the most effective activator, speeding up the condensation tremendously. Pyridinium bromide and tosylate can also he regarded as powerful substitutes for the commonly used 1H-tetrazole. The acidic pK_a of the pyridinium cation provides an optimal range for phosphoramidite activation, which is followed by a nucleophilic attack of the pyridine ring to give a P-pyridinio intermediate as the most likely precursor of phosphite ester formation. ³¹P-NMR studies indirectly support this proposal.

Helvetica Chimica Acta 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, Related Products of pyridine-derivatives.

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

Varghese, Hema Tresa published the artcileVibrational spectroscopic studies and ab initio calculations of pyridine-3-sulfonic acid, Synthetic Route of 636-73-7, the publication is Asian Journal of Chemistry (2007), 19(4), 2627-2632, database is CAplus.

FT-Raman and FT-IR spectra of pyridine-3-sulfonic acid were recorded and analyzed. The mol. geometry and vibrational wave numbers of pyridine-3-sulfonic acid have been calculated using the Hartree-Fock method with different basis sets. Comparison of the observed fundamental vibrational wavenumbers of pyridine-3-sulfonic acid with calculated results by Hartree-Fock method is found in agreement with the exptl. data.

Asian Journal of 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 C10H15NO, Synthetic Route of 636-73-7.

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

Krommyda, Kalliopi published the artcileA Remarkable Effect of Aluminum on the Novel and Efficient Aqueous-Phase Hydrogenation of Levulinic Acid into γ-Valerolactone Using Water-Soluble Platinum Catalysts Modified with Nitrogen-Containing Ligands, SDS of cas: 636-73-7, the publication is Catalysis Letters (2019), 149(5), 1250-1265, database is CAplus.

The catalytic performance of novel water-soluble platinum catalysts modified with various nitrogen-containing and phosphine ligands in the hydrogenation reaction of levulinic acid (LA) into γ-valerolactone (GVL) has been studied in environmentally attractive, green, aqueous monophasic systems. The presence of the Lewis acid aluminum enormously increases the catalytic activity of water-soluble platinum catalysts modified with nitrogen-containing ligands in the LA hydrogenation reaction and high catalytic activities up to 3540 TOF’s per h with a quant. selectivity towards GVL have been achieved using Na₂PtCl₆·6H₂O precursors modified with the bidentate bathophenanthrolinedisulfonic acid disodium salt (BPhDS) ligand and low amounts of AlCl₃·6H₂O promotors (molar ratio of AlCl₃·6H₂O/Pt = 0.17) in aqueous media. This unprecedented increase in catalytic activity with aluminum promotors for water-soluble transition metal catalytic systems in aqueous-phase hydrogenation reactions has not been described until now in the literature. The apparent activation energy of platinum catalyst modified with the monodentate nitrilotriacetic acid trisodium salt ligand in aqueous medium was calculated and amounts to a relative low value of 73.04 kJ mol^-1 when one considers that in the LA hydrogenation reaction this catalyst reduces a less reactive keto group into alc. functionality. A recycling experiment of the Pt/BPhDS/Al catalyst from the aqueous monophasic LA hydrogenation reaction mixture followed by biphasic recovery of the catalyst in active form from organic reaction products by extraction and simple phase separation of an aqueous/organic two-phase system formed after addition of di-Et ether has shown that the Pt/BPhDS/Al catalyst is stable without loss of activity and selectivity in a consecutive run.

Catalysis 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 C5H5NO3S, SDS of cas: 636-73-7.

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

Xue, Yuan published the artcilePalladium-Catalyzed β-C(sp³)-H Nitrooxylation of Ketones and Amides Using Practical Oxidants, Safety of Pyridine-3-sulfonic acid, the publication is ACS Catalysis (2021), 11(22), 14188-14193, database is CAplus.

Herein, a Pd(II)-catalyzed β-C(sp³)-H nitrooxylation of ketones and native amides was reported. The fine-tuned removable aminooxyamide auxiliary enabled β-C(sp³)-H functionalization of various aliphatic ketones. Practical iron(III) nitrate nonahydrate was used as the nitrate source and a single-electron oxidant for Pd(II)/Pd(III)/Pd(IV) catalysis. For amide substrates, N-iodosuccinimide (NIS) was applied as a bystanding two-electron oxidant in combination with silver nitrate for β-C(sp³)-H nitrooxylation. Palladacycle intermediates were isolated and characterized to elucidate the reaction mechanism for the C(sp³)-H activation of ketones with the L,X-type imino-amide directing group.

ACS Catalysis 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 C9H10O3S, Safety of Pyridine-3-sulfonic acid.

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

Nirmalram, Jeyaraman Selvaraj published the artcileHydrogen-bonding patterns in pyrimethaminium pyridine-3-sulfonate, Recommanded Product: Pyridine-3-sulfonic acid, the publication is Acta Crystallographica, Section E: Structure Reports Online (2010), 66(8), o2121-o2122, database is CAplus and MEDLINE.

In the asym. unit of the title salt [systematic name: 2,4-diamino-5-(4-chlorophenyl)-6-ethylpyrimidin-1-ium pyridine-3-sulfonate], C₁₂H₁₄N₄Cl⁺·C₅H₄NSO₃^–, there are two independent pyrimethaminium cations and two 3-pyridine sulfonate anions. Each sulfonate group interacts with the corresponding protonated pyrimidine ring through two N-H…O hydrogen bonds, forming a cyclic hydrogen-bonded bimol. R₂²(8) motif. Even though the primary mode of association is the same, the next higher level of supramol. architectures are different due to different hydrogen-bonded networks. In one of the independent mols. in the asym. unit, the pyrimethamine cation is paired centrosym. through N-H…N hydrogen bonds, generating an R₂²(8) ring motif. In the other mol., the pyrimethamine cation does not form any base pairs; instead it forms hydrogen bonds with the 3-pyridine sulfonate anion. The structure is further stabilized by C-H…O, C-H…N and π-π stacking [centroid-centroid distance = 3.9465 (13) Å] interactions. Crystallog. data are given.

Acta Crystallographica, Section E: Structure Reports Online 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, Recommanded Product: Pyridine-3-sulfonic acid.

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