Month: December 2022

Jensen, Mark P. published the artcileSolvent Extraction Separation of Trivalent Americium from Curium and the Lanthanides, Recommanded Product: 6,6′-((1,4,10,13-Tetraoxa-7,16-diazacyclooctadecane-7,16-diyl)bis(methylene))dipicolinic acid, the publication is Solvent Extraction and Ion Exchange (2015), 33(4), 329-345, database is CAplus.

The sterically constrained, macrocyclic, aqueous soluble ligand N,N’-bis[(6-carboxy-2-pyridyl)methyl]-1,10-diaza-18-crown-6 (H₂BP18C6) was investigated for separating americium from curium and all the lanthanides by solvent extraction Pairing H₂BP18C6, which favors complexation of larger f-element cations, with acidic organophosphorus extractants that favor extraction of smaller f-element cations, such as bis-(2-ethylhexyl)phosphoric acid (HDEHP) or (2-ethylhexyl)phosphonic acid mono(2-ethylhexyl) ester (HEH[EHP]), created solvent extraction systems with good Cm/Am selectivity, excellent trans-lanthanide selectivity (K_ex,Lu/K_ex,La = 10⁸), but poor selectivity for Am against the lightest lanthanides. However, using an organic phase containing both a neutral extractant, N,N,N’,N’-tetra(2-ethylhexyl)diglycolamide (TEHDGA), and HEH[EHP] enabled rejection of the lightest lanthanides during loading of the organic phase from aqueous nitric acid, eliminating their interference in the americium stripping stages. In addition, although it is a macrocyclic ligand, H₂BP18C6 does not significantly impede the mass transfer kinetics of the HDEHP solvent extraction system.

Solvent Extraction and Ion Exchange published new progress about 1128304-86-8. 1128304-86-8 belongs to pyridine-derivatives, auxiliary class Pyridines, name is 6,6′-((1,4,10,13-Tetraoxa-7,16-diazacyclooctadecane-7,16-diyl)bis(methylene))dipicolinic acid, and the molecular formula is C26H36N4O8, Recommanded Product: 6,6′-((1,4,10,13-Tetraoxa-7,16-diazacyclooctadecane-7,16-diyl)bis(methylene))dipicolinic acid.

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

Jensen, Mark P. published the artcileAqueous Complexes for Efficient Size-based Separation of Americium from Curium, Formula: C26H36N4O8, the publication is Inorganic Chemistry (2014), 53(12), 6003-6012, database is CAplus and MEDLINE.

Complexation of the adjacent actinide ions americium(III) and curium(III) by the ligand N,N’-bis[(6-carboxy-2-pyridyl)methyl]-1,10-diaza-18-crown-6 (H₂bp18c6) in aqueous solution was studied to quantify and characterize its americium/curium selectivity. Liquid-liquid extraction and spectrophotometric titration indicated the presence of both fully deprotonated and monoprotonated complexes, An(bp18c6)⁺ and An(Hbp18c6)²⁺ (An = Am or Cm), at the acidities that would be encountered when treating nuclear wastes. The stability constants of the complexes in 1 M NaNO₃ determined using competitive complexation were log β₁₀₁ = 15.49 ± 0.06 for Am and 14.88 ± 0.03 for Cm, indicating a reversal of the usual order of complex stability, where ligands bind the smaller Cm^III ion more tightly than Am^III. The Am/Cm selectivity of bp18c6^2- that is defined by the ratio of the Am and Cm stability constants (β₁₀₁ Am/β₁₀₁ Cm = 4.1) is the largest reported so far for binary An^III-ligand complexes. Theor. d. functional theory calculations using the B3LYP functional suggest that the ligand’s size-selectivity for larger 4f- and 5f-element cations arises from steric constraints in the crown ether ring. Enhanced 5f character in MOs involving actinide-nitrogen interactions is predicted to favor actinide(III) complexation by bp18c6^2- over the complexation of similarly sized lanthanide(III) cations.

Inorganic Chemistry published new progress about 1128304-86-8. 1128304-86-8 belongs to pyridine-derivatives, auxiliary class Pyridines, name is 6,6′-((1,4,10,13-Tetraoxa-7,16-diazacyclooctadecane-7,16-diyl)bis(methylene))dipicolinic acid, and the molecular formula is C26H36N4O8, Formula: C26H36N4O8.

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

Costanzo, L. L. published the artcileSensitized photoisomerization of pyridylhydrazones, COA of Formula: C11H10N4, the publication is Journal of Photochemistry (1980), 14(2), 125-32, database is CAplus.

The syn–anti isomerizations of benzaldehyde 2-pyridylhydrazone (I) and 2-pyridinecarboxaldehyde 2-pyridylhydrazone (II) by triplet energy transfer were investigated. II underwent reversible isomerization without side reactions; the triplet states implied in the process were quenchable by azulene and their lifetime was determined Isomerization and secondary photolysis reactions occurred simultaneously in I, regardless of the nature of the sensitizer. The pathways of the direct and sensitized isomerizations do not involve intersystem crossing.

Journal of Photochemistry 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, COA of Formula: C11H10N4.

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

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

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

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

Chen, Dongsheng published the artcileOne-Pot Synthesis of Indole-3-acetic Acid Derivatives through the Cascade Tsuji-Trost Reaction and Heck Coupling, COA of Formula: C5H5BrN2, the publication is Journal of Organic Chemistry (2018), 83(12), 6805-6814, database is CAplus and MEDLINE.

A practical palladium-mediated cascade Tsuji-Trost reaction/Heck coupling of N-Ts o-bromoanilines with 4-acetoxy-2-butenoic acid derivatives using a Pd(OAc)2/P(o-tol)3/DIPEA system is described for a straightforward synthesis of indole-3-acetic acid derivs, e.g. I. This methodol. was successfully applied to synthesize various substituted indole/azaindole-3-acetic acid derivatives and Almotriptan, which is a drug for the acute treatment of migraine. Moreover, a plausible cyclization mechanism has been proposed.

Journal of Organic 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, COA of Formula: C5H5BrN2.

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

Kong, Xianqiang published the artcileA Practically Unified Electrochemical Strategy for Ni-Catalyzed Decarboxylative Cross-Coupling of Aryl Trimethylammonium Salts, COA of Formula: C12H9NO, the publication is Organic Letters (2022), 24(11), 2137-2142, database is CAplus and MEDLINE.

By merging electrocatalysis and nickel catalysis, a unified strategy was successfully applied for preparing aryl ketones ArC(O)Ph [Ar = Ph, 4-ClC₆H₄, 4-MeC₆H₄, etc.], amides ArC(O)NR¹R² [Ar = Ph, 4-ClC₆H₄, 4-MeC₆H₄, etc.; R¹ = R² = Me, Et; R¹R² = CH₂(CH₂)₂CH₂, CH₂CH₂OCH₂CH₂], esters ArC(O)OR [Ar = Ph, 2-MeC₆H₄, 4-FC₆H₄, etc.; R = Me, Et] or aldehydes ArCHO [Ar = Ph, 4-MeC₆H₄, 4-PhC₆H₄, etc.] via decarboxylative cross-coupling of four types of α-oxocarboxylic acids and their derivatives with aryl trimethylammonium salts under mild conditions.

Organic Letters 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, COA of Formula: C12H9NO.

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

Huang, Xiang published the artcileVisible-Light-Catalyzed in Situ Denitrogenative Sulfonylation of Sulfonylhydrazones, Recommanded Product: Phenyl(pyridin-2-yl)methanone, the publication is Organic Letters (2021), 23(17), 6784-6788, database is CAplus and MEDLINE.

A photocatalyzed in situ denitrogenative sulfonylation of N-arylsulfonyl hydrazones was developed to afford (arylsulfonylalkyl)arenes I [R¹ = Ph, 2-MeC₆H₄, 1-naphthyl, etc.; R² = H, Me, Ph; R³ = 4-MeC₆H₄, 4-BrC₆H₄, 2-naphthyl, etc.]. This transformation provided a low-carbon strategy to assemble arylalkyl sulfones in a stepwise denitrogenation/sulfonylation manner.

Organic Letters 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