Category: 338800-13-8

Kindl, M. published the artcileScreening of phosphine ligands for anti-Markovnikov hydration of alkynes, Related Products of pyridine-derivatives, the publication is Chemicke Listy (2016), 110(11), 832-835, database is CAplus.

Hydration of C≃C bond is a very efficient synthetic step. Currently, there exist ruthenium catalytic complexes, preferably with phosphine or bipyridine ligands, able to hydrate with “anti-Markovnikov” selectivity, producing aldehydes. Although development of novel hydration catalysts was fruitful in recent years, only very few mechanistic studies of mol. structural influences are described. On the model hydration or 1-heptyne, we tested a series of various organophosphine ligands with various nitrogen functionalities having different acid-base properties. This screening showed that ligands with methylene-substituted nitrogen in five-membered ring are very promising to synthesize a catalyst for anti-Markovnikov hydration of alkynes.

Chemicke Listy 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

Simler, Thomas published the artcileChromium(II) Pincer Complexes with Dearomatized PNP and PNC Ligands: A Comparative Study of Their Catalytic Ethylene Oligomerization Activity, Category: pyridine-derivatives, the publication is Organometallics (2016), 35(24), 4044-4049, database is CAplus.

Monodeprotonation of the 2,6-bis(di-tert-butylphosphinomethyl)pyridine (^tBuPN^tBuP) at the α-lutidinyl-CH₂ position with 1 equiv of KCH₂C₆H₅ and concomitant dearomatization of the heterocycle afforded K(^tBuP^*N_a^tBuP) (^tBuP^* = di-tert-Bu vinylic P donor, ^tBuP = PtBu₂, N_a = anionic amido N donor); its transmetalation with [CrCl₂(THF)₂] afforded the Cr(II) complex [Cr(^tBuP^*N_a^tBuP)Cl] (A). The x-ray diffraction anal. of A established a slightly distorted square-planar coordination geometry at the metal center and confirmed retention of the dearomatized coordinated ligand. The catalytic activity of A in ethylene oligomerization was studied and compared with that of the related Cr(II) complexes [Cr(^tBuP^*N_aC^NHC)Cl] (B) and [Cr{Cr(^tBuP^*N_a^tBuP^*)Cl}₂] (C) previously reported.

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 C5H5N3S, Category: pyridine-derivatives.

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

Besmer, Manuel Luca published the artcileExploring the Coordination Chemistry of N₂ with Technetium PNP Pincer-Type Complexes, COA of Formula: C23H43NP2, the publication is Inorganic Chemistry (2021), 60(9), 6696-6701, database is CAplus and MEDLINE.

Dinitrogen (N₂) complexes of technetium (⁹⁹Tc) are rare, and only two examples have been reported. To complement this important class of complexes also for ⁹⁹Tc, two different pincer-type complexes of ⁹⁹Tc were studied to assess their abilities for coordinating dinitrogen. The reactions of the ⁹⁹Tc^III complex [⁹⁹TcCl₃(PPh₃)₂(NCCH₃)] with the pincer ligands PNP^tBu and ^PyrPNP^tBu resp. gave [⁹⁹Tc(PNP^tBu)Cl₂] and [⁹⁹Tc(^PyrPNP^tBu)Cl₃], the first structurally characterized ⁹⁹Tc complexes with mer-coordinated pincer ligands. Reductions with [Co(Cp*)₂] under N₂ gave the mononuclear bis-dinitrogen complex [⁹⁹Tc^I(PNP^tBu)(N₂)₂] and the dinuclear complex [⁹⁹Tc^I(^PyrPNP^tBu)(N₂)Cl]₂(μ-N₂) with both a bridging and a terminal N₂ ligand. Spectroscopy and crystal structures confirm their identities. The complexes are stable under a dinitrogen atm., and the N₂ ligands are tightly bound. The results for the complexes with the PNP^tBu pincer allow a comparison to its rhenium homolog, which has recently been shown to split the N₂ ligand with the formation of a nitrido complex.

Inorganic 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, COA of Formula: C23H43NP2.

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

Shaffer, David W. published the artcileSpin-state diversity in a series of Co(II) PNP pincer bromide complexes, Quality Control of 338800-13-8, the publication is Dalton Transactions (2016), 45(44), 17910-17917, database is CAplus and MEDLINE.

The authors describe the structural and electronic impacts of modifying the bridging atom in a family of Co(II) pincer complexes Co(t-Bu)₂P^EPy^EP(t-Bu)₂Br₂ (Py = pyridine, E = CH₂, NH, and O for compounds 1–3, resp.). Structural characterization by single crystal x-ray diffraction indicates that compounds 1 and 3 are 5-coordinate complexes with both bromides bound to the Co ion, while compound 2 is square planar with one bromide in the outer coordination sphere. The reduction potentials of 1–3, characterized by cyclic voltammetry, are consistent with the increasing electron-withdrawing character of the pincer ligand as the linker (E) between the pyridine and phosphine arms becomes more electroneg. Magnetic property studies of compounds 1 and 2 confirm high- and low-spin behavior, resp., through a broad temperature range. However, complex 3 features an unusual combination of high spin S = 3/2 Co(II) and temperature dependent spin-crossover between S = 3/2 and S = 1/2 states. The different magnetic behaviors observed among the three CoBr₂ pincer complexes reflects the importance of small ligand perturbations on overall coordination geometry and resulting spin state properties.

Dalton Transactions 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 C7H5ClN2S, Quality Control of 338800-13-8.

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

Rayder, Thomas M. published the artcileEngineering Second Sphere Interactions in a Host-Guest Multicomponent Catalyst System for the Hydrogenation of Carbon Dioxide to Methanol, Product Details of C23H43NP2, the publication is Journal of the American Chemical Society (2021), 143(3), 1630-1640, database is CAplus and MEDLINE.

Many enzymes utilize interactions extending beyond the primary coordination sphere to enhance catalyst activity and/or selectivity. Such interactions could improve the efficacy of synthetic catalyst systems, but the supramol. assemblies employed by biol. to incorporate second sphere interactions are challenging to replicate in synthetic catalysts. Herein, a strategy is reported for efficiently manipulating outer-sphere influence on catalyst reactivity by modulating host-guest interactions between a noncovalently encapsulated transition-metal-based catalyst guest and a metal-organic framework (MOF) host. This composite consists of a ruthenium PNP pincer complex encapsulated in the MOF UiO-66 that is used in tandem with the zirconium oxide nodes of UiO-66 and a ruthenium PNN pincer complex to hydrogenate carbon dioxide to methanol. Due to the method used to incorporate the complexes in UiO-66, structure-activity relationships could be efficiently determined using a variety of functionalized UiO-66-X hosts. These investigations uncovered the beneficial effects of the ammonium functional group (i.e., UiO-66-NH₃⁺). Mechanistic experiments revealed that the ammonium functionality improved efficiency in the hydrogenation of carbon dioxide to formic acid, the first step in the cascade. Isotope effects and structure-activity relationships suggested that the primary role of the ammonium functionality is to serve as a general Bronsted acid. Importantly, the cooperative influence from the host was effective only with the functional group in close proximity to the encapsulated catalyst. Reactions carried out in the presence of mol. sieves to remove water highlighted the beneficial effects of the ammonium functional group in UiO-66-NH₃⁺ and resulted in a 4-fold increase in activity. As a result of the modular nature of the catalyst system, the highest reported turnover number (TON) (19 000) and turnover frequency (TOF) (9100 h^-1) for the hydrogenation of carbon dioxide to methanol are obtained. Moreover, the reaction was readily recyclable, leading to a cumulative TON of 100 000 after 10 reaction cycles.

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, Product Details of C23H43NP2.

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

Prechtl, Martin H. G. published the artcileSynthesis and characterisation of nonclassical ruthenium hydride complexes containing chelating bidentate and tridentate phosphine ligands, Product Details of C23H43NP2, the publication is Chemistry – A European Journal (2007), 13(5), 1539-1546, database is CAplus and MEDLINE.

The synthesis and characterization of nonclassical Ru hydride complexes containing bidentate diphosphine and tridentate PCP (1,3-bis(di-tert-butylphosphinomethyl)benzene) and PNP (1,6-bis(di-tert-butylphosphinomethyl)pyridine) pincer-type ligands are described. The mononuclear and dinuclear Ru complexes presented were synthesized in moderate to high yields by the direct hydrogenation route (1-pot synthesis) or in a two-step procedure. In both cases [Ru(cod)(metallyl)₂] served as a readily available precursor. The influences of the coordination geometry and the ligand framework on the structure, binding, and chem. properties of the M-H₂ fragments were studied by x-ray crystal structure anal., spectroscopic methods, and reactivity towards N₂, D₂, and deuterated solvents.

Chemistry – A European Journal 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, Product Details of C23H43NP2.

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

Feller, Moran published the artcileCO₂ activation by metal-ligand-cooperation mediated by iridium pincer complexes, Formula: C23H43NP2, the publication is Journal of Coordination Chemistry (2018), 71(11-13), 1679-1689, database is CAplus.

Herein we report the reversible activation of CO₂ by the dearomatized complex [(^tBuPNP*)Ir(COE)] and by the aromatized complex [(^tBuPNP)Ir(C₆H₅)] via metal-ligand cooperation (MLC) (^tBuPN = 2,6-bis-(di-tert-butylphosphinomethyl)pyridine; ^tBuPNP* = deprotonated PNP; COE = cyclooctadiene). The [1,3]-addition of CO₂ to both complexes is reversible at ambient temperature While the dearomatized complex reacts readily at ambient temperature with CO₂ in THF or benzene, the aromatized complex reacts with CO₂ upon heating in benzene at 80 °C or at ambient temperature in THF. The novel aromatized complex [(^tBuPNP)IrCl] does not react with CO₂. Based on the reactivity patterns of these complexes with CO₂, we suggest that CO₂ activation via MLC takes place only via the dearomatized species, and that in the case of [(^tBuPNP)Ir(C₆H₅)], THF plays a role as a polar solvent in facilitating formation of the dearomatized hydrido Ph complex intermediate.

Journal of Coordination 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, Formula: C23H43NP2.

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

Feller, Moran published the artcileCationic, Neutral, and Anionic PNP Pd^II and Pt^II Complexes: Dearomatization by Deprotonation and Double-Deprotonation of Pincer Systems, Synthetic Route of 338800-13-8, the publication is Inorganic Chemistry (2010), 49(4), 1615-1625, database is CAplus and MEDLINE.

Cationic, neutral, and anionic Pd^II and Pt^II PNP (PNP = 2,6-bis(di-tert-butylphosphinomethyl)pyridine) complexes were synthesized. The neutral, dearomatized complexes [(PNP^*)MX] (PNP^* = deprotonated PNP; M = Pd, Pt; X = Cl, Me) were prepared by deprotonation of the PNP methylene group of the corresponding cationic complexes [(PNP)MX][Cl] with 1 equiv of base (KN(SiMe₃)₂ or ^tBuOK), while the anionic complexes [(PNP^**)MX]^–Y⁺ (PNP^** = double-deprotonated PNP; Y = Li, K) were prepared by deprotonation of the two methylene groups of the corresponding cationic complexes with either 2 equiv of KN(SiMe₃)₂ or an excess of MeLi. While the reaction of [(PNP)PtCl][Cl] with an excess of MeLi led only to the anionic complex without chloride substitution, reaction of [(PNP)PdCl][Cl] with an excess of MeLi led to the methylated anionic complex [(PNP^**)PdMe]^–Li⁺. NMR studies, x-ray structures, and d. functional theory (DFT) calculations reveal that the neutral complexes have a broken aromatic system with alternating single and double bonds, and the deprotonated arm is bound to the ring by an exocyclic C:C double bond. The anionic complexes are best described as a π system comprising the ring carbons conjugated with the exocyclic double bonds of the deprotonated arms. The neutral complexes are reversibly protonated to their cationic analogs by H₂O or MeOH. The thermodn. parameters ΔH, ΔS, and ΔG for the reversible protonation of the neutral complexes by MeOH were obtained.

Inorganic 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, Synthetic Route of 338800-13-8.

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

Feller, Moran published the artcileMononuclear Rh(II) PNP-Type Complexes. Structure and Reactivity, Product Details of C23H43NP2, the publication is Inorganic Chemistry (2007), 46(25), 10479-10490, database is CAplus and MEDLINE.

The Rh(II) mononuclear complexes [(PNP^tBu)RhCl][BF₄] (2), [(PNP^tBu)Rh(OC(O)CF₃)] (4), and [(PNP^t-Bu)Rh(acetone)][BF₄]₂ (6), where PNP^tBu = 2,6-bis(di-tert-butylphosphinomethyl)pyridine, were synthesized by oxidation of the corresponding Rh(I) analogs with silver salts. However, treatment of (PNP^tBu)RhCl with AgOC(O)CF₃ led only to chloride abstraction, with no oxidation 2 And 6 were characterized by x-ray diffraction, EPR, cyclic voltammetry, and dipole moment measurements. 2 And 6 react with NO gas to give diamagnetic [(PNP^tBu)Rh(NO)Cl][BF₄] (7) and [(PNP^tBu)Rh(NO)(acetone)][BF₄]₂ (8), resp. 6 Is reduced to Rh(I) in the presence of phosphines, CO, or isonitriles to give the Rh(I) complexes [(PNP^tBu)Rh(PR₃)][BF₄] (11, 12) (R = t, Ph), [(PNP^tBu)Rh(CO)][BF₄] (13) and [(PNP^tBu)Rh(L)][BF₄] (15, 16) (L = tert-Bu isonitrile or 2,6-dimethylphenyl isonitrile), resp. However, 2 disproportionates to Rh(I) and Rh(III) complexes in the presence of acetonitrile, or CO. 2 Is also reduced by triethylphosphine and water to Rh(I) complexes [(PNP^tBu)RhCI] (1) and [(PNP^tBu)Rh(PEt₃)][BF₄] (11). When triphenylphosphine and water were used, the reduced Rh(I) complex reacts with a proton, which is formed in the redox reaction to give a Rh(III) complex with a coordinated BF₄, [(PNP^tBu)Rh(Cl)(H)(BF₄)] (9).

Inorganic 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, Product Details of C23H43NP2.

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

Kuriyama, Shogo published the artcileNitrogen fixation catalyzed by ferrocene-substituted dinitrogen-bridged dimolybdenum-dinitrogen complexes: unique behavior of ferrocene moiety as redox active site, Recommanded Product: 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, the publication is Chemical Science (2015), 6(7), 3940-3951, database is CAplus and MEDLINE.

A series of dinitrogen-bridged dimolybdenum-dinitrogen complexes bearing metallocene-substituted PNP-pincer ligands is synthesized by the reduction of the corresponding monomeric molybdenum-trichloride complexes under 1 atm of mol. dinitrogen. Introduction of ferrocene as a redox-active moiety to the pyridine ring of the PNP-pincer ligand increases the catalytic activity for the formation of ammonia from mol. dinitrogen, up to 45 equivalent of ammonia being formed based on the catalyst (22 equivalent of ammonia based on each molybdenum atom of the catalyst). The time profile for the catalytic reaction reveals that the presence of the ferrocene unit in the catalyst increases the rate of ammonia formation. Electrochem. measurement and theor. studies indicate that an interaction between the Fe atom of the ferrocene moiety and the Mo atom in the catalyst may play an important role to achieve a high catalytic activity.

Chemical Science 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, Recommanded Product: 2,6-Bis((di-tert-butylphosphino)methyl)pyridine.

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