Tag: M.W=350-400

Tsuruta, Keisuke published the artcileElectrochemical Condensation of Methylviologen on Specifically-adsorbed Anion Layers, Product Details of C22H18Cl2N2, the publication is Electroanalysis (2019), 31(6), 1150-1154, database is CAplus.

The adsorption of methylviologen dications (MV²⁺) on single-crystalline Au electrodes in both H₂SO₄ and HClO₄ was examined MV²⁺ strongly interacted with sulfate and bisulfate anions adsorbed on the Au(111) electrode surface in 0.05 M H₂SO₄ under a controlled potential of 1.25 V vs. the reversible hydrogen electrode (RHE). A characteristic non-Faradaic current was observed at 1.10 V vs. RHE. When adsorption of MV²⁺ was carried out in 0.1 M HClO₄, the electrochem. response of MV²⁺ was less than that obtained in H₂SO₄. The results show that the formation of a highly ordered sulfate/bisulfate adlayer plays an important role in the formation of condensed MV²⁺ layers. Examination of polycrystalline Au and Au(100) electrodes revealed a poor electrochem. response due to the surface roughness of the Au substrate, but the electrochem. detection was applicable to polycrystalline Au electrodes. A systematic investigation of the structural dependency of viologen derivatives showed that mol. size is important for electrostatic interactions with a highly ordered sulfate/bisulfate adlayer. The findings of the present study demonstrate successful detection of MV²⁺ at a concentration of â‰? pM with a non-Faradaic current.

Electroanalysis published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C6H9BN2O2, Product Details of C22H18Cl2N2.

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

Kawatsura, Motoi published the artcileTransition Metal-Catalyzed Addition of Amines to Acrylic Acid Derivatives. A High-Throughput Method for Evaluating Hydroamination of Primary and Secondary Alkylamines, Application of 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, the publication is Organometallics (2001), 20(10), 1960-1964, database is CAplus.

Several new classes of transition metal-catalyzed reactions of amines with the C:C bond of acrylic acid derivatives were discovered using a high-throughput colorimetric assay. This assay is general for the reactions of primary and secondary alkylamines with acrylic acid derivatives, and the screening of potential catalysts using this assay revealed a number of different metal/ligand combinations that promote these hydroaminations. The colorimetric assay revealed catalysts for the addition of piperidine to methacrylonitrile, crotononitrile, Et crotonate, and Et methacrylate, as well as catalysts for reactions of butylamine and aniline with methacrylonitrile, with product yields of 89-99%. A catalyst for the addition of aniline to crotononitrile at 100° was also discovered. Thus, treating crotononitrile with aniline in presence of 10% Pd(OAc)₂ and 10% 1,3-bis[(di-tert-butylphosphino)methyl]benzene gave 90% 2-anilinopropyl cyanide. The products of these reactions are basic building blocks for the synthesis of β-amino acids, amino alcs., and diamines. These reactions may ultimately produce an enantioselective route to optically active difunctional materials from commodity reagents.

Organometallics published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, Application of 2,6-Bis((di-tert-butylphosphino)methyl)pyridine.

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

Gawali, Suhas Shahaji published the artcileIron-catalyzed regioselective cyclotrimerization of alkynes to benzenes, Application of 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, the publication is Journal of Organometallic Chemistry (2019), 139-149, database is CAplus.

We report the synthesis and characterization of simple di(aminomethyl)pyridine ligated iron-pincer complexes, which catalyzed the regioselective [2+2+2]-cyclotrimerization of terminal aryl and alkyl alkynes to provide the 1,2,4-trisubstituted benzene mols. Interestingly, internal alkynes also exhibited similar cyclization and resulted in hexa-substituted benzene compounds Increased steric bulk on pincer ligands diminished the selectivity for cycloaddition Cyclotrimerization reactions proceeded at room temperature upon activation of catalyst by a Grignard reagent. EPR studies indicated thermally induced spin crossover effect in catalyst.

Journal of Organometallic Chemistry published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, Application of 2,6-Bis((di-tert-butylphosphino)methyl)pyridine.

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

de Boer, Sandra Y. published the artcileCu^I click catalysis with cooperative noninnocent pyridylphosphine ligands, Related Products of pyridine-derivatives, the publication is Inorganica Chimica Acta (2012), 336-342, database is CAplus.

The authors describe the synthesis and characterization of compound L1H, 2-di(tert-butyl)phosphinomethyl-6-methylpyridine (NP^tBu), and the 1st dimeric Cu^I complex, [Cu(μ-Br)(L1H)]₂ (3), with this novel bidentate ligand. The mol. structure of 3 was determined by x-ray crystallog. The ligand scaffold exhibits noninnocent reactivity through dearomatization behavior, similar to its well-studied tridentate analog L2H, 2,6-bis((di-tert-butylphosphino)methyl)pyridine (PNP^tBu). The mol. structure of [Cu(CCPh)(L2H)]₂ (4) is reported, which is a rare case of a crystallog. characterized Cu-acetylide dimer. Cu(I) complexes with either ligand L1H or L2H or their dearomatized counterparts act as active, cooperative catalysts for the [2+3] polar cycloaddition of azides and acetylenes. These results represent the 1st indications of selective Cu-based cooperative catalysis, using noninnocent lutidine-based PNP backbone. Catalysts [Cu(PN-P^tBu)] (2, PN-P^tBu = de-aromatized L2H (C₆H₃P(:CHP^tBu₂)-2-(CH₂P^tBu₂)-6)) and [Cu(CCPh)(L2H)] (5) could thus be termed all-inclusive systems for this reaction.

Inorganica Chimica Acta published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, Related Products of pyridine-derivatives.

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

Kong, Fanji published the artcileEffects of Additives on Catalytic Arene C-H Activation: Study of Rh Catalysts Supported by Bis-phosphine Pincer Ligands, HPLC of Formula: 338800-13-8, the publication is Organometallics (2020), 39(21), 3918-3935, database is CAplus.

Hydrogen-deuterium exchange (H/D exchange) is a method commonly used for studying catalytic activation of C-H(D) bonds by transition metal complexes. In this study, a series of additives were studied for H/D exchange of toluene-d₈ with acetic acid (HOAc) using (^RPNP)Rh(X) complexes (R = phosphine substituents including cyclohexyl, iso-Pr and tert-butyl; X = trifluoroacetate or acetate) as the precatalysts. Cu(OAc)₂ and AgOAc additives were found to benefit Rh-mediated C-H(D) activation of toluene with meta-para selectivity by facilitating the conversion to active (^RPNP)Rh species and stabilizing the Rh catalysts from decomposition to inactive Rh(s). In contrast, nonoxidizing Lewis acid additives, such as B(OMe)₃ or NaOAc, were not effective at facilitating Rh-catalyzed toluene C-H activation. The complexes (^RPNP)Rh^III(H)(X)₂ and [(^RPNP)Rh^I(CO)][X] (X = TFA or OAc) were found to be intermediates of the catalytic the H/D exchange.

Organometallics published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, HPLC of Formula: 338800-13-8.

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

Mathis, Cheryl L. published the artcileThermodynamic Analysis of Metal-Ligand Cooperativity of PNP Ru Complexes: Implications for CO₂ Hydrogenation to Methanol and Catalyst Inhibition, Application In Synthesis of 338800-13-8, the publication is Journal of the American Chemical Society (2019), 141(36), 14317-14328, database is CAplus and MEDLINE.

The hydrogenation of CO₂ in the presence of amines to formate, formamides, and methanol (MeOH) is a promising approach to streamlining carbon capture and recycling. To achieve this, understanding how catalyst design impacts selectivity and performance is critical Herein we describe a thorough thermochem. anal. of the (de)hydrogenation catalyst, (PNP)Ru-Cl (PNP = 2,6-bis(di-tert-butylphosphinomethyl)pyridine; Ru = Ru(CO)(H)) and correlate our findings to catalyst performance. Although this catalyst is known to hydrogenate CO₂ to formate with a mild base, we show that MeOH is produced when using a strong base. Consistent with pK_a measurements, the requirement for a strong base suggests that the deprotonation of a six-coordinate Ru species is integral to the catalytic cycle that produces MeOH. Our studies also indicate that the concentration of MeOH produced is independent of catalyst concentration, consistent with a deactivation pathway that is dependent on methanol concentration, not equivalency. Our temperature-dependent equilibrium studies of the dearomatized congener, (*PNP)Ru, with various H-X species (to give (PNP)Ru-X; X = H, OH, OMe, OCHO, OC(O)NMe₂) reveal that formic acid equilibrium is approx. temperature-independent; relative to H₂, it is more favored at elevated temperatures We also measure the hydricity of (PNP)Ru-H in THF and show how subsequent coordination of the substrate can impact the apparent hydricity. The implications of this work are broadly applicable to hydrogenation and dehydrogenation catalysis and, in particular, to those that can undergo metal-ligand cooperativity (MLC) at the catalyst. These results serve to benchmark future studies by allowing comparisons to be made among catalysts and will pos. impact rational catalyst design.

Journal of the American Chemical Society published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, Application In Synthesis of 338800-13-8.

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

Mochida, Tomoyuki published the artcileAssembled structures and magnetic properties of viologen-[M(mnt)₂] charge-transfer salts (mnt = maleonitriledithiolate; M = Cu, Ni, Pt), HPLC of Formula: 47369-00-6, the publication is Inorganica Chimica Acta (2012), 111-116, database is CAplus.

Ion-pair compounds of phenyl-substituted viologen dications with [M(mnt)₂] dianions (mnt = maleonitriledithiolate) were prepared and characterized. (Benzyl viologen)[M(mnt)₂] (M = Cu (1), Ni (2), Pt (3)) and (Ph viologen)[Cu(mnt)₂] (4) exhibited mixed-stack crystal structures, whereas (dinitrophenyl viologen)[Cu(mnt)₂] (5) exhibited no π-π interactions. Magnetic susceptibility measurements revealed that 1 exhibits a ferromagnetic exchange interaction (Weiss constant θ = +0.9 K), possibly mediated by the diamagnetic cation. Antiferromagnetic interactions were observed for 4 (θ = -2.0 K) and 5 (θ = -2.9 K), whereas 2 and 3 were diamagnetic. Absorption bands assignable to charge transfer were observed in the mixed-stack salts in the visible to near-IR region.

Inorganica Chimica Acta published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C22H18Cl2N2, HPLC of Formula: 47369-00-6.

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

Ben-Ari, Eyal published the artcileSelective Ortho C-H Activation of Haloarenes by an Ir(I) System, Computed Properties of 338800-13-8, the publication is Journal of the American Chemical Society (2003), 125(16), 4714-4715, database is CAplus and MEDLINE.

The cationic Ir(I) complex [(PNP)Ir(cyclooctene)][PF₆] (1, PNP = 2,6-bis-(di-tert-Bu-phosphinomethyl)pyridine) reacts with benzene at 25° yielding quant. the square pyramidal Ph-hydride complex cis-[(PNP)Ir(Ph)(H)][PF₆] (2), in which the hydride is trans to the vacant coordination site. The cationic complex 2 is stable to heating at 100°, in sharp contrast to the previously reported unstable neutral, isoelectronic [(PCP)Ir(H)(Ph)] (PCP = η³-2,6-(^tBu₂PCH₂)₂C₆H₃). Heating of 2 at 50° with other arenes results in arene exchange. Complex 1 activates C-H bonds of chloro- and bromobenzene with no C-halide oxidative addition being observed Selective ortho C-H activation takes place, the process being directed by halogen coordination and being thermodynamically and kinetically favorable. The meta- and para-C-H activation products are formed at a slower rate than the ortho isomer and are converted to the latter upon standing in solution NMR data and an x-ray crystallog. study of the ortho-activated chlorobenzene complex, which was obtained as the only product upon heating of 1 with chlorobenzene at 60°, show that the chloro substituent is coordinated to the metal center.

Journal of the American Chemical Society published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, Computed Properties of 338800-13-8.

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

Hermann, Dominik published the artcileSynthesis, Structure, and Reactivity of New Rhodium and Iridium Complexes, Bearing a Highly Electron-Donating PNP System. Iridium-Mediated Vinylic C-H Bond Activation, Synthetic Route of 338800-13-8, the publication is Organometallics (2002), 21(5), 812-818, database is CAplus.

Reaction of the new highly electron-donating PNP ligand [2,6-bis-(di-tert-butylphosphinomethyl)pyridine] (1) with [Rh(COE)₂Cl]₂ (COE = cyclooctene) at room temperature gave the neutral Rh(I) complex [Rh(PNP)Cl] (2). Unsaturated cationic complexes [Rh(PNP)(MeCN)]BF₄ (3) and [Rh(PNP)(C₂H₄)]SO₃CF₃ (4) were obtained in reaction of 1 with [(COE)₂Rh(MeCN)₂]BF₄ and [(C₂H₄)₂Rh(THF)₂]SO₃CF₃, resp. Upon reaction of the PNP ligand 1 with [Ir(COE)₂Cl]₂, facile vinylic C-H activation takes place, yielding the hydrido-vinyl complex [ClIr(PNP)(H)(C₈H₁₃)] (5). Also, coordination of ligand 1 to the cationic Ir complex [Ir(COD)₂]BF₄ (COD = cyclooctadiene) in RCN (R = CH₃, CHMe₂, CMe₃) led to Ir insertion into a vinylic C-H bond, resulting in [(RCN)Ir(PNP)(H)(C₈H₁₁)]BF₄ (6a–c). The hydrido-vinyl complexes 6a,c readily react with H₂ (2 atm) at room temperature, affording the Ir dihydride complexes [(RCN)Ir(PNP)(H)₂]BF₄ (R = CH₃, CMe₃) (7a,b). Crystal structures were obtained for compounds 5,6a,6b, and 7a.

Organometallics published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, Synthetic Route of 338800-13-8.

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

Zhang, Jing published the artcileStable Carbene and Diazoalkane Complexes of the Same Complex System. Synthesis, Structure, and Reactivity of PNP-Ru(II) Fluorenylidene and Diazofluorene Complexes, Product Details of C23H43NP2, the publication is Organometallics (2008), 27(14), 3526-3533, database is CAplus.

The choice of synthetic methodol. leads to either carbene or diazoalkane complexes of the same system. Thus, treatment of RuCl₂(PPh₃)₃ with 9-diazofluorene followed ^tBu-PNP (^tBu-PNP = 2,6-bis(di-tert-butylphosphinomethyl)pyridine) resulted in loss of dinitrogen and formation of the Ru(II) fluorenylidene complex 1. On the other hand, treatment of the ^tBu-PNP Ru(II) dinitrogen complex 4 with 9-diazofluorene resulted in the formation of η¹-dizaofluorene Ru(II) complex 5, in which the diazo unit remains intact. The cationic Ru(II) carbene complex 2 was obtained by the reaction of 1 with 1 equivalent of AgBF₄ or HBF₄. Chloride dissociation to form a 16-e cationic carbene complex 3 took place also upon refluxing of 1 in toluene. The five-coordinated, unsaturated, charge-neutral diiodide Ru(II) complex 6 was obtained by reaction of 4 with NaI. Complex 6 is stabilized by a C-H agostic interaction, as observed by x-ray crystallog. Reaction of 4 with NaBEt₃H followed by 9-dizaofluorene resulted in a novel η¹-diazenofluorene Ru(II) complex 7, accompanied by the migration of one hydrogen atom from the metal center to the coordinated nitrogen atom of the diazenofluorene unit. Heating complex 7 at 65° resulted in sp² C-H activation followed by elimination of dihydrogen to form the chelated, β-carbon coordinated diazenofluorene ruthenium complex 8. Complexes 1, 2, 5, 6, and 8 were structurally characterized by x-ray crystallog.

Organometallics published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C7H7ClN2S, Product Details of C23H43NP2.

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