Category: 636-73-7

Zheng, Wen-Rui published the artcileS=O homolytic bond dissociation enthalpies in sulfones: high-level ab initio and DFT study, Computed Properties of 636-73-7, the publication is Journal of Sulfur Chemistry (2012), 33(5), 541-559, database is CAplus.

The S=O bond dissociation enthalpies (BDE) of sulfone derivatives were calculated using high-level ab initio methods including G3, G3B3, CBS-Q, CBS-4M and MP2. Based on the comparison of these theor. values and exptl. ones, the performances of a number of d. functional theory methods were then assessed. It was found that the KMLYP method gave the lowest root mean square error. We, therefore, used this method to calculate the S=O BDEs of a number of substituted sulfones. The electronic effect of the substituents and the remote substituent effect of aryl-substituted sulfones on S=O BDEs were investigated. In addition, a MO anal. of typical mols. was conducted in order to investigate the electronic effect on S=O BDEs. We also predicted several S=O BDE values of heteroaromatic-substituted sulfones using the KMLYP method.

Journal of Sulfur 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 C15H24S, Computed Properties of 636-73-7.

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

Akiri, Kalyanachakravarthi published the artcileCrystal Structures of Pyridine Sulfonamides and Sulfonic Acids, SDS of cas: 636-73-7, the publication is Crystal Growth & Design (2012), 12(9), 4567-4573, database is CAplus.

Despite the widespread occurrence of pyridinesulfonic acid and pyridinesulfonamide functional groups in drugs and pharmaceuticals, and their use as ligands in metal-organic frameworks, a systematic structural study of their H bonding and mol. packing is lacking. Crystal structures of 2-, 3-, and 4-pyridinesulfonic acids/amides in terms of N⁺-H···O^– H bonds, N-H···O dimer/catemer synthons, and graph set notations are discussed. This model study provides a background for polymorph screening and solid form hunting of pharmacol. active sulfonamides.

Crystal Growth & Design 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

Badlueva, T. V. published the artcileNew proton-conductive membrane for fuel cell applications, Quality Control of 636-73-7, the publication is Izvestiya VUZov, Prikladnaya Khimiya i Biotekhnologiya (2014), 15-19, database is CAplus.

Proton conductive membranes based on tetra-Et orthosilicate and pyridine-3-sulfonic acid have been synthesized. The characteristics of the received membranes: proton-conductivity at different temperatures and structure were studied.

Izvestiya VUZov, Prikladnaya Khimiya i Biotekhnologiya 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, Quality Control of 636-73-7.

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

Lebedeva, O. V. published the artcileHybrid ion-exchange membranes based on heteroaromatic sulfonic acid derivatives, HPLC of Formula: 636-73-7, the publication is Petroleum Chemistry (2015), 55(5), 333-338, database is CAplus.

Membranes exhibiting proton conductivity have been prepared by sol-gel synthesis using tetraethoxysilane and heteroaromatic sulfonic acid derivatives (2-phenyl-5-benzimidazolesulfonic acid and 3-pyridinesulfonic acid) in the presence of phosphoric acid and polyvinyl butyral. The membranes are gels composed of a polyvinyl butyral polymer matrix with uniformly distributed particles of silica containing mols. of heteroaromatic sulfonic acid derivatives mech. incorporated in its network structure. The membranes synthesized from 2-phenyl-5-benzimidazolesulfonic acid or 3-pyridinesulfonic acid exhibit a conductivity of 0.1X10^-2 or 0.55X10^-2 S/cm at 353 K, an ion-exchange capacity of 2.70 or 1.84 mequiv/g, and a proton-transfer activation energy of 24.93 or 21.73 kJ/mol, resp.; at a relative water content of 50%, the tensile strength is 4 or 6 MPa and the elastic modulus is 128 or 191 MPa, resp.

Petroleum 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, HPLC of Formula: 636-73-7.

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

Schneider, Cedric published the artcileDirected ortho-Metalation-Cross-Coupling Strategies. One-Pot Suzuki Reaction to Biaryl and Heterobiaryl Sulfonamides, Application of Pyridine-3-sulfonic acid, the publication is Organic Letters (2011), 13(14), 3588-3591, database is CAplus and MEDLINE.

A general synthesis of stable ortho-boropinacolato aryl and heteroaryl sulfonamides by directed ortho-metalation (DoM) and either MeOBPin or i-PrOBpin electrophile quench is described. A one-pot metalation-Suzuki cross-coupling procedure for the synthesis of biaryls and heterobiaryls, and a complementary DoM-Ir-catalyzed boronation sequence are delineated.

Organic 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, Application of Pyridine-3-sulfonic acid.

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

Vallejo, Luis Felipe published the artcileRenaturation and purification of bone morphogenetic protein-2 produced as inclusion bodies in high-cell-density cultures of recombinant Escherichia coli, COA of Formula: C5H5NO3S, the publication is Journal of Biotechnology (2002), 94(2), 185-194, database is CAplus and MEDLINE.

Escherichia coli was genetically engineered to produce recombinant human bone morphogenetic protein-2 (rhBMP-2) in a non-active aggregated form using a temperature-inducible expression system. High concentrations of both biomass (75 g cell dry weight per L of culture broth) and inactive rhBMP-2 (8.6 g l^-1) were obtained by applying a high-cell-d. cultivation procedure. After washing and solubilizing the inclusion bodies, rhBMP-2 was refolded and dimerized at concentrations up to 100 mg l^-1 by means of a simple dilution method with yields exceeding 50%. Finally, a one-step purification procedure based on affinity chromatog. was implemented to isolate the rhBMP-2 dimer. With the established renaturation and purification protocols, yields of more than 10 mg rhBMP-2 dimer per g cell dry weight were obtained corresponding to 750 mg rhBMP-2 dimer per L of culture broth. The purified rhBMP-2 dimer showed biol. activity equivalent to CHO produced rhBMP-2 as tested by the induction of alk. phosphatase activity in C2C12 cells.

Journal of Biotechnology 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 C4H3Cl2N3, COA of Formula: C5H5NO3S.

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

Karaman, Rafik published the artcileSynthesis and characterization of the first water-soluble closely interspaced cofacial porphyrin dimer, Synthetic Route of 636-73-7, the publication is Journal of Organic Chemistry (1991), 56(11), 3470-2, database is CAplus.

The only documented example of a quadruply-bridged, closely-interspaced cofacial porphyrin dimer was synthesized by Kagan (1977). The target of this communication is the synthesis and characterization of the first water soluble quadruply-bridged, closely-interspaced cofacial porphyrin I (R = R¹). Reaction of meso-tetrakis(3-bromomethylphenyl)porphyrin with m-pyridinesulfonamide provides the closely-interspaced cofacial porphyrin dimer I (R = R²) which on quaternization with MeI provides the water soluble I (R = R¹). Reactions of I with Zn(OAc)₂ provided the corresponding bis-zinc complexes I. Porphyrins I and their bis-zinc complexes, exist in a closed down conformation with closely approaching porphyrin planes or in an open conformation. It was established, on the basis of ¹H-NMR UV/vis, and emission spectrophotometries, and I (R = R²) exists in a closed down conformation in DMSO or acetone and a more open conformation is CHCl₃. With zinc complexes of I (or protonated I) the conformation is open regardless of the solvent.

Journal of Organic 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, Synthetic Route of 636-73-7.

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

Karaman, Rafik published the artcileSymmetrical and unsymmetrical quadruply aza-bridged, closely interspaced, cofacial bis(5,10,15,20-tetraphenylporphyrin)s. 2. Synthesis, characterization, and conformational effects of solvents, Formula: C5H5NO3S, the publication is Journal of the American Chemical Society (1992), 114(12), 4889-98, database is CAplus.

Title compounds I [X = NR, R = 3-pyridylsulfonyl (R¹), 1-methylpyridinium-3-sulfonyl (R²), CONH₂, cyano, tosyl; X = OCO₂, R = R¹, cyano] have been synthesized and fully characterized by 2-dimensional ¹H-¹H NMR (COSY), 2-dimensional ¹³C-¹H NMR, fast-atom-bombardment mass spectrometry, UV/vis, IR, and fluorescence spectral techniques. It was established, on the basis of ¹H NMR, UV/vis, and emission spectrophotometries, that I (X = NR, R = R¹, R², tosyl) exist in more than one conformational in DMSO and in only one sym. conformation in CHCl₃. Their biszinc complexes and tetraprotonated derivatives exist in one conformation regardless of the solvent. These observations have been attributed to an interaction between DMSO and the pyrrolic N-H protons of the porphyrin cores which is inhibited by metalation or protonation. Mol. dynamics calculations reveal that the intracavity interactions of I (X = NR, R = R¹) with DMSO are more important than the intercavity interactions which result in discrete, unsym. conformations of the dimer. In contrast, I (X = OCO₂, R = R¹, cyano; X = NR, R = cyano, CONH₂) do not show any conformational changes upon switching from CHCl₃ to DMSO. This is attributed to the long interplanar distances calculated for the porphyrin dimers which prevent intracavity coordination of DMSO with both porphyrin moieties. ¹H NMR variable-temperature experiments of I (X = NR, R = R¹) in DMSO show that the conformation of the dimer is greatly affected by temperature While at room temperature I (X = NR, R = R¹) exists in more than one conformation, at higher temperatures (150°) only one conformation is populated. It is proposed that at room temperature, the existence of a H-bonding network between DMSO and the dimer results in more than one conformation, while at higher temperatures the network is destroyed to furnish an average conformation.

Journal of the American Chemical Society 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, Formula: C5H5NO3S.

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

Mushrush, George W. published the artcileChemical basis of middle-distillate fuel instability – interactive effects of selected nitrogen heterocycles with organic acids and bases in a shale-derived diesel fuel, Formula: C5H5NO3S, the publication is Oil Shale Symposium Proceedings (1991), 74-81, database is CAplus.

Fuel-instability reactions with increasing time in storage usually are defined in terms of the formation of deleterious products, such as filterable sediment and peroxides. These detrimental products of long-term storage continue to be a problem in the utilization of middle-distillate fuels. Gravimetric stability tests have been carried out at 80° by using 2 model N heterocycles: 2,5-dimethylpyrrole (DMP) and 3-methylindole (3-MI) in an otherwise stable shale-derived diesel fuel. Potential interactive effects for these N heterocycles in this stable middle-distillate fuel have been described by the presence of organic acid and base co-dopants. Organic acid co-dopants included hexanoic acid, acetic acid, dodecylbenzene sulfonic acid, and p-toluene sulfonic acid; organic bases employed included tri-n-butylamine, N,N-di-Me aniline, and 4-dimethylamino pyridine. Co-dopants were selected on the number of polar species present in a shale-derived diesel fuel. The fuel matrix containing the co-dopants, 2,5-dimethylpyrrole and dodecylbenzene sulfonic acid, generated the largest quantity of filterable sediment yet observed in any of the stability tests. Simple organic amines exerted only minor interactive effects, usually an increase in filterable sediment of 5-15%. However, the diamine species, 4-dimethylamino pyridine, interacted in a strongly pos. fashion to generate increased amounts of sediment. Hydroperoxide levels were monitored for each reaction mixture Co-dopants had a drastic beneficial effect on observed hydroperoxide concentration

Oil Shale Symposium Proceedings 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, Formula: C5H5NO3S.

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

Moustani, Chrysavgi published the artcileNovel aqueous-phase hydrogenation reaction of the key biorefinery platform chemical levulinic acid into γ-valerolactone employing highly active, selective and stable water-soluble ruthenium catalysts modified with nitrogen-containing ligands, Related Products of pyridine-derivatives, the publication is Applied Catalysis, B: Environmental (2018), 82-92, database is CAplus.

High catalytic activities (TO = 000 ^-1) have been achieved by novel water-soluble ruthenium catalysts modified with nitrogen-containing ligands such as the bathophenanthrolinedisulfonic acid disodium salt (BPhDS) in the hydrogenation reaction of the renewable polar platform chem. levulinic acid (LA) which possesses a central relevance in the development of biorefineries of the future in a sustainable way to produce with essentially quant. selectivity of 99.9 mol% γ-valerolactone (GVL) in aqueous media. The apparent activation energy of the Ru/BPhDS catalyst was calculated and amounts a relative low value of 53.3 J/mol 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 Ru/BPhDS catalyst by extraction after addition of di-Et ether has shown that the catalyst is stable without loss of activity and selectivity in a consecutive run.

Applied Catalysis, B: Environmental 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