Tag: 100-200

Li, Zi-Qi; Fu, Yue; Deng, Ruohan; Tran, Van T.; Gao, Yang; Liu, Peng; Engle, Keary M. published an article in 2020, the title of the article was Ligand-controlled regiodivergence in nickel-catalyzed hydroarylation and hydroalkenylation of alkenyl carboxylic acids.Safety of 2-(4,5-Dihydro-4,4-dimethyl-2-oxazolyl)pyridine And the article contains the following content:

A nickel-catalyzed regiodivergent hydroarylation and hydroalkenylation of unactivated alkenyl carboxylic acids is reported, whereby the ligand environment around the metal center dictates the regiochem. outcome. Markovnikov hydrofunctionalization products are obtained under mild ligand-free conditions, with up to 99% yield and >20:1 selectivity. Alternatively, anti-Markovnikov products can be accessed with a novel 4,4-disubstituted Pyrox ligand I in excellent yield and >20:1 selectivity. Both electronic and steric effects on the ligand contribute to the high yield and selectivity. Mechanistic studies suggest a change in the turnover-limiting and selectivity-determining step induced by the optimal ligand. DFT calculations reveal that in the anti-Markovnikov pathway, repulsion between the ligand and the alkyl group is minimized (by virtue of it being 1° vs. 2°) in the rate- and regioselectivity-determining transmetalation transition state. The experimental process involved the reaction of 2-(4,5-Dihydro-4,4-dimethyl-2-oxazolyl)pyridine(cas: 109660-12-0).Safety of 2-(4,5-Dihydro-4,4-dimethyl-2-oxazolyl)pyridine

The Article related to hydroarylation regiodivergent alkenyl carboxylic acid boronic acid nickel catalyst, hydroalkenylation regiodivergent alkenyl carboxylic acid boronic acid nickel catalyst, Benzene, Its Derivatives, and Condensed Benzenoid Compounds: Carboxylic Acids and Peroxycarboxylic Acids and Their Sulfur-Containing Analogs and Salts and other aspects.Safety of 2-(4,5-Dihydro-4,4-dimethyl-2-oxazolyl)pyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On September 1, 2003, El Ali, Bassam published an article.Application of 636-73-7 The title of the article was Rh6(CO)16-H3PW12O40-catalyzed one pot hydroformylation-cyclotrimerization of cyclohexene and cyclopentene to 2,4,6-trisubstituted 1,3,5-trioxanes. And the article contained the following:

One-pot hydroformylation-cyclotrimerization of cyclopentene and cyclohexene was selectively catalyzed by Rh6(CO)16 and H3PW12O40·xH2O (HPA-W12) in THF at 40 atm (CO/H2 = 1/1) and afforded 2,4,6-tris(cycloalkyl)-1,3,5-trioxanes as major products along with the corresponding aldehydes. The experimental process involved the reaction of Pyridine-3-sulfonic acid(cas: 636-73-7).Application of 636-73-7

The Article related to hydroformylation cyclotrimerization cyclohexene cyclopentene rhodium tungstophosphoric acid catalyst, trioxane tricycloalkyl preparation hexarhodium hexadecacarbonyl tungstophosphoric acid catalyst and other aspects.Application of 636-73-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On September 5, 2012, Akiri, Kalyanachakravarthi; Cherukuvada, Suryanarayan; Rana, Soumendra; Nangia, Ashwini published an article.Related Products of 636-73-7 The title of the article was Crystal Structures of Pyridine Sulfonamides and Sulfonic Acids. And the article contained the following:

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. The experimental process involved the reaction of Pyridine-3-sulfonic acid(cas: 636-73-7).Related Products of 636-73-7

The Article related to crystal structure pyridinesulfonamide pyridinesulfonic acid, mol structure pyridinesulfonamide pyridinesulfonic acid, hydrogen bond dimer catemer synthon pyridinesulfonamide pyridinesulfonic acid and other aspects.Related Products of 636-73-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On April 30, 2013, Zhao, Hongwu; Yue, Yuanyuan; Li, Hailong; Sheng, Zhihui; Yang, Zhao; Meng, Wei published an article.Name: [2,2′-Bipyridine]-3,3′-diamine The title of the article was Asymmetric synthesis of novel axially chiral 2,2′-bipyridine N,N’-dioxides bearing α-amino acid residues and their applications in enantioselective allylation of aromatic aldehydes with allyltrichlorosilane. And the article contained the following:

A series of novel axially chiral 2,2′-bipyridine N,N’-dioxides bearing C1 or C2-symmetry were synthesized by the use of enantiopure α-amino acids as chiral sources. The absolute stereochem. of the axial chirality of these organocatalysts was clearly assigned by CD measurements together with literature protocols. The reactivities and enantioselectivities of these organocatalysts were examined in the reactions of aromatic aldehydes with allyltrichlorosilane, thus providing the desired products with moderate yields and enantioselectivies. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Name: [2,2′-Bipyridine]-3,3′-diamine

The Article related to amino acid bipyridine oxide asym synthesis allylation catalyst, aromatic aldehyde allylchlorosilane enantioselective allylation bipyridine oxide catalyst, benzylic homoallyl alc asym synthesis and other aspects.Name: [2,2′-Bipyridine]-3,3′-diamine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On March 1, 1987, Heinisch, Gottfried; Loetsch, Gerhard published an article.Synthetic Route of 97483-79-9 The title of the article was Homolytic alkoxycarbonylation reactions in two-phase systems. 3. Introduction of a single carboxylic acid ester function into cyano- or (alkoxycarbonyl)-substituted N-heteroaromatics. And the article contained the following:

Radical alkoxycarbonylation of pyridines I (R = cyano, CO2Et, R1-R3 = H; R = R2 = R3 = H, R1 = cyano, CO2Et; R = R1 = R3 = H, R2 = cyano, CO2Et) with MeCOCO2Me or MeCOCO2Et in H2O-CH2Cl2 containing H2O2-FeSO4 gave mainly monosubstitution products. Thus, I (R = cyano, R1-R3 = H) was treated with MeCOCO2Et to give 34% I (R = cyano, R1 = R3 = H, R2 = CO2Et) and 13% I (R = cyano, R1 = R2 = H, R3 = CO2Et). Similarly, I (R = R2 = R3 = H, R1 = CO2Et) reacted with MeCOCO2Me to give 29% I (R = CO2Me, R1 = CO2Et, R2 = R3 = H), 36% I (R = R3 = H, R1 = CO2Et, R2 = CO2Me), and 20% I (R = R2 = H, R1 = CO2Et, R3 = CO2Me). Only the mixed ester I (R = CO2Me, R1 = R3 = H, R2 = CO2Et) was obtained (in 81% yield) by treating I (R = R1 = R3 = H, R2 = CO2Et) with MeCOCO2Me. The experimental process involved the reaction of Ethyl 6-cyanopicolinate(cas: 97483-79-9).Synthetic Route of 97483-79-9

The Article related to pyridine alkoxycarbonyl cyano, cyanopyridinecarboxylate, pyridazinedicarboxylate, homolytic alkoxycarbonylation cyanopyridine pyruvate, radical alkoxycarbonylation pyridinecarboxylate pyruvate and other aspects.Synthetic Route of 97483-79-9

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On August 31, 2010, Nirmalram, Jeyaraman Selvaraj; Muthiah, Packianathan Thomas published an article.Formula: C5H5NO3S The title of the article was Hydrogen-bonding patterns in pyrimethaminium pyridine-3-sulfonate. And the article contained the following:

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. The experimental process involved the reaction of Pyridine-3-sulfonic acid(cas: 636-73-7).Formula: C5H5NO3S

The Article related to pyrimethaminium pyridine sulfonate salt crystal structure, supramol mol structure pyrimethaminium pyridinesulfonate salt, hydrogen bond pi stacking pyrimethaminium pyridinesulfonate salt and other aspects.Formula: C5H5NO3S

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On January 9, 2003, Rist, Oystein; Hogberg, Thomas; Holst Lange, Birgitte; Schwartz, Thue W.; Elling, Christian E. published a patent.Computed Properties of 75449-26-2 The title of the patent was Use of metal ion chelates in validating biological molecules as drug targets in test animal models. And the patent contained the following:

The invention discloses the use of chem. compounds or selections of chem. compounds (libraries) of the general Formula R1XFY(R1)GZR1 [F, G = N, O, S, Se, P; X, Y, Z = (un)branched C1-12 alkyl, aryl, heteroaryl, etc.; R1 = ABC; A = coupling or connecting moiety; B = spacer moiety; C = functional group] for in vivo methods for testing or validating the physiol. importance and/or the therapeutic or pharmacol. potential of biol. target mols., notably proteins such as, e.g., receptors and especially 7TM receptors in test animals expressing the biol. target mol. with, notably, a silent, engineered metal ion site. Use of specific metal ion binding sites of a generic nature in specific biol. target mols. such as, e.g. transmembrane proteins wherein the metal ion binding site is capable of forming a complex with a metal ion is also described. Also disclosed are chem. compounds or libraries suitable for use in methods for improving the in vivo pharmacokinetic behavior of metal ion chelates (e.g. the absorption pattern, the plasma half-life, the distribution, the metabolism and/or the elimination of the metal ion chelates). In order to improve the efficacy of the impact of the metal ion chelate on the biol. target mol. after administration of the metal ion chelate in vivo to a test animal, it is advantageous e.g. to increase the period during which the metal ion chelate is in the circulatory system and/or localized at the target. Further disclosed are metal ion-chelating compounds designed to be suitable for use in a target validation process according to the invention, as well as libraries of at least two or more of such metal ion-chelating compounds The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Computed Properties of 75449-26-2

The Article related to metal chelate drug screening target validation, protein target drug screening metal chelate, receptor target drug screening metal chelate, pharmacokinetics metal chelate drug screening and other aspects.Computed Properties of 75449-26-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Gumbau-Brisa, R.; Hayward, J. J.; Wallis, J. D.; Rawson, J. M.; Pilkington, M. published an article in 2016, the title of the article was Structural insights into the coordination chemistry and reactivity of a 3,3′-bis-imine-2,2′-bipyridine ligand.Recommanded Product: [2,2′-Bipyridine]-3,3′-diamine And the article contains the following content:

The coordination chem. of ligand L8 Schiff-base derived from 6,6′-diamine-2,2′-bipyridine and salicylaldehyde, with Lewis acidic metal ions affords mononuclear [Sn(L9)Cl4] (1) and two paramagnetic dimers [Cu(L9)(sal)]2(ClO4)2, (2) and [Mn(L9)Cl2(EtOH)]2 (3). The x-ray crystal structures of 1-3 reveal a propensity for L8 to undergo metal catalyzed hydrolysis and cyclization to the diazepine ligand L9. Theor. calculations on L8 and a model Sn(IV) complex reveal that coordination to a metal ion weakens the imine bonds, rendering them more susceptible to hydrolysis reactions and/or attack by nucleophiles. In contrast, reaction of L8 with FeCl3 in the presence of base affords the partial hydrolysis product [Fe(L10)2]Cl·CH3CN (4). Tuning the reaction conditions via the addition of a 2nd base slows down the hydrolysis of the ligand sufficiently to afford a few crystals of the μ2-oxo diferric complex (μ-O)[Fe(L8)]2·2CH3CN (5) in which intact L8 coordinates to the Fe(III) in a bis-bidentate manner through a deprotonated salicyl oxygen and a bis-imine nitrogen lone pair, with the nitrogen atoms of its 2,2′-bipyridine remaining uncoordinated. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Recommanded Product: [2,2′-Bipyridine]-3,3′-diamine

The Article related to tin transition metal schiff diaminebipyridine salicylaldehyde diazepine complex preparation, crystal structure tin transition metal schiff diaminebipyridine salicylaldehyde diazepine and other aspects.Recommanded Product: [2,2′-Bipyridine]-3,3′-diamine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On September 30, 2009, Li, Hong Liang published an article.Computed Properties of 75449-26-2 The title of the article was 2,2′-[(2,2′-Bipyridine-3,3′-diyl)bis(nitrilomethylidyne)]diphenol. And the article contained the following:

The title mol., C24H18N4O2, lies on a 2-fold rotation axis with a dihedral angle of 73.7(1)° between the mean planes of the symmetry-related pyridine rings. The dihedral angle between unique benzene and pyridine rings is 8.0(1)°. An intramol. O-H…N H bond may influence the mol. conformation. In the crystal structure, there are weak π-π stacking interactions with a centroid-centroid distance of 3.7838(15) Å. Crystallog. data and at. coordinates are given. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Computed Properties of 75449-26-2

The Article related to mol structure bipyridinediyl nitrilomethylidyne phenol, crystal structure bipyridinediyl nitrilomethylidyne phenol, hydrogen bond bipyridinediylnitrilomethylidynediphenol, pi stacking interaction bipyridinediylnitrilomethylidynediphenol and other aspects.Computed Properties of 75449-26-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On May 27, 2005, Toele, P.; Glasbeek, M. published an article.Electric Literature of 75449-26-2 The title of the article was Ultrafast excited-state intramolecular double proton transfer dynamics of [2,2′-bipyridyl]-3,3′-diamine. And the article contained the following:

A femtosecond fluorescence upconversion study of [2,2′-bipyridyl]-3,3′-diamine (BP(NH2)2), in liquid solution, is reported. It is concluded that photoexcited BP(NH2)2 undergoes a branched intramol. double proton transfer reaction comprising two trajectories: (a) ultrafast double proton transfer (<100 fs) followed by twisting (∼250 fs); (b) a combined process of double proton transfer and twisting, with an overall reaction time of ∼250 fs. Picosecond transient fluorescence is attributed to vibrational cooling in the excited product state. The lifetime of ∼10 ps of the tautomer product state is indicative of conical intersection of the product- and ground-state potential energy surfaces. The experimental process involved the reaction of [2,2'-Bipyridine]-3,3'-diamine(cas: 75449-26-2).Electric Literature of 75449-26-2

The Article related to fluorescence upconversion study bipyridyldiamine photoinduced intramol double proton transfer, excited state intramol double proton transfer dynamics bipyridyldiamine, photoinduced tautomerization photophys photochem bipyridyldiamine and other aspects.Electric Literature of 75449-26-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem