Month: December 2022

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

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

Volpi, G. published the artcileFluorescent trifluoromethylated imidazo[1,5-a]pyridines and their application in luminescent down-shifting conversion, Category: pyridine-derivatives, the publication is Journal of Luminescence (2022), 118529, database is CAplus.

In the last few years, imidazo[1,5-a]pyridine derivatives have attracted growing attention due to their unique optical behaviors. Herein, a series of trifluoromethylated substituted imidazo[1,5-a]pyridine derivatives were synthesized and their optical properties investigated. Depending on the position of the trifluoromethylated substituents on the imidazo[1,5-a]pyridine nucleus, we were able to tune the quantum yields (Φ) both in acetonitrile solution (from 13% to 39%) and in the polymeric matrix (10%-58%) with a remarkable large Stokes shift. The investigated fluorophores were dispersed in a transparent polyurethane resin, providing a possible luminescent low-cost material for down-shifting conversion. An anal. based on the chem. structures and spectroscopic data, both in solution and polymeric medium, is reported to address the best strategies to optimize the photophys. properties and prevent aggregation. Finally, optimized polyurethane-based films prepared with compounds 2 and 3 were tested as a luminescent coating on a com. photodiode, enabling their technol. application.

Journal of Luminescence 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 C12H20O6, Category: pyridine-derivatives.

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

Jadhav, Jagannath published the artcilePd-catalyzed cascade reaction for the synthesis of 2-substituted indoles, Related Products of pyridine-derivatives, the publication is Synlett (2012), 23(17), 2511-2515, database is CAplus.

An efficient cascade methodol. toward the synthesis of 2-substituted indoles has been developed. The transformation proceeds via a palladium-catalyzed cross-coupling reaction of o-nitrobenzyl cyanides with boronic acids. The use of Fe as co-catalyst during the course of reaction gives significant enhancement in reaction rates. The developed protocol allows for the unprecedented use of arylboronic acids as coupling partners for constructing 2-substituted indoles.

Synlett published new progress about 197958-29-5. 197958-29-5 belongs to pyridine-derivatives, auxiliary class Pyridine,Boronic acid and ester, name is 2-Pyridinylboronic acid, and the molecular formula is C5H6BNO2, Related Products of pyridine-derivatives.

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

Petiot, Pauline published the artcilePalladium-catalyzed cross-coupling reaction of functionalized aryl- and hetero-arylbismuthanes with 2-halo(or 2-triflyl)-azines and -diazines, Synthetic Route of 89076-64-2, the publication is European Journal of Organic Chemistry (2013), 2013(24), 5282-5289, database is CAplus.

The palladium-catalyzed cross-coupling of highly functionalized organobismuthanes with 2-halo(or 2-triflyl)pyridines, -pyrimidines, -pyrazines, and -pyridazines is reported. The reaction tolerates numerous functional groups, including aldehydes. The synthesis of a shelf-stable (formylphenyl)bismuth reagent and its use in a cross-coupling reaction is also described.

European Journal of Organic Chemistry published new progress about 89076-64-2. 89076-64-2 belongs to pyridine-derivatives, auxiliary class Pyridine,Nitro Compound,Benzene, name is 5-Nitro-2-phenylpyridine, and the molecular formula is C11H8N2O2, Synthetic Route of 89076-64-2.

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

Kitamura, Akira published the artcileApplication of KU 5SDH-2 pelletron accelerator to elemental analyses of marine-environmental substances and agricultural products, Recommanded Product: Triphenyl(pyridin-1-ium-1-yl)borate, the publication is Kobe Daigaku Daigakuin Kaiji Kagaku Kenkyuka Kiyo (2007), 147-154, database is CAplus.

Two subjects offered in reply to a campaign for promotion of accelerator application are studied. One is quant. anal. of B content in the seabed mud, which might be related to triphenylboranepyridine (TPBP) currently used as antifouling agent. Nuclear reaction anal. (NRA) using ¹¹B(p,3α) reaction is able to quantify B concentration of the order of ppm in highly pure C, and the seabed mud in Fukae port contains B with a concentration of the order of 100 ppm, which is one order of magnitude greater than that in the earth crust. The other is elemental anal. of garlic to distinguish the place of its cultivation. Particle-induced-x-ray-emission (PIXE) anal. and ⁷Li(p,2α)-NRA are successfully applied to find that the garlic cultivated in China contains richer amount of Fe, Sr and Li than domestic one by a factor of 3.0, 2.4 and 94, resp. The accelerator analyses could be widely applied in a variety of fields of environmental science and agriculture.

Kobe Daigaku Daigakuin Kaiji Kagaku Kenkyuka Kiyo published new progress about 971-66-4. 971-66-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is Triphenyl(pyridin-1-ium-1-yl)borate, and the molecular formula is C23H20BN, Recommanded Product: Triphenyl(pyridin-1-ium-1-yl)borate.

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

Suzuki, Shoko published the artcileAsymmetric fluorination of β-keto esters catalyzed by chiral rare earth perfluorinated organophosphates, COA of Formula: C6H5F4NO3S, the publication is Tetrahedron: Asymmetry (2006), 17(4), 504-507, database is CAplus.

Novel chiral rare earth metal complexes bearing perfluorinated binaphthyl phosphate ligand RE[(R)-F₈BNP]₃ (RE = rare earth; F₈BNP = 5,5′,6,6′,7,7′,8,8′-octafluoro-1,1′-binaphthyl-2,2′-diyl phosphate) have been synthesized and used as a catalyst for the asym. electrophilic fluorination reaction of β-keto esters. The target catalysts are tris[(11bR)-8,9,10,11,12,13,14,15-octafluoro-4-(hydroxy-κO)dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin 4-(oxide-κO)]scandium, lanthanum, gadolinium, ytterbium, indium complexes. The use of Sc[(R)-F₈BNP]₃ catalyst in combination with 1-fluoropyridinium triflate (NFPY-OTf) as a fluorinating agent was found to give the desired α-fluoro-β-keto esters in high chem. yields and enantiomeric excesses (up to 88% ee) under mild conditions.

Tetrahedron: Asymmetry published new progress about 107263-95-6. 107263-95-6 belongs to pyridine-derivatives, auxiliary class Fluorination reagent, name is 1-Fluoropyridiniumtriflate, and the molecular formula is C5H6BNO2, COA of Formula: C6H5F4NO3S.

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

Yakushiji, Yuki published the artcileEvaluation for degradation of pyridine-triphenylborane anti-fouling agent in acetonitrile using capillary zone electrophoresis, Computed Properties of 971-66-4, the publication is Bunseki Kagaku (2009), 58(4), 301-304, database is CAplus.

A com. organoborane compound, pyridine-triphenylborane (PTPB), is often applied to ship hulls as an anti-fouling agent in order to keep them free from marine organisms, such as barnacles and bivalves. However, the degradation process of PTPB and its degradation products have not been well understood, because of lack of an anal. method for both PTPB and its estimated degradation products. We previously developed a procedure using capillary zone electrophoresis (CZE) with direct UV detection for the simultaneous determination of PTPB and its estimated degradation products, such as diphenylborinic acid (DPB), phenylboronic acid (MPB), and phenol. For this study, simple degradation experiments were carried out to verify the usefulness of the proposed method for further PTPB degradation investigations. That is to say, PTPB samples dissolved in acetonitrile were put in the open air and a dark place to examine the effects of the light intensity and the temperature on the degradation of PTPB. The sample solutions were analyzed by the CZE method with the elapse of time. As a result, it was suggested that the degradation of PTPB was significantly affected by the light intensity, rather than the temperature It has consequently been demonstrated that the CZE method is a useful tool to elucidate the degradation process of PTPB and its degradation products.

Bunseki Kagaku published new progress about 971-66-4. 971-66-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is Triphenyl(pyridin-1-ium-1-yl)borate, and the molecular formula is C6H5F4NO3S, Computed Properties of 971-66-4.

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

Kaewchuay, Netnapit published the artcileSimultaneous determination of pyridine-triphenylborane anti-fouling agent and its degradation products in paint-waste samples using capillary zone electrophoresis with field-amplified sample injection, COA of Formula: C23H20BN, the publication is Analytical Sciences (2012), 28(12), 1191-1196, database is CAplus and MEDLINE.

We proposed a capillary zone electrophoresis (CZE) procedure using field-amplified sample injection (FASI) for the simultaneous determination of pyridine-triphenylborane (PTPB) and its degradation products: diphenylborinic acid (DPB), phenylboronic acid (MPB), and phenol. The LODs for PTPB, DPB, MPB, and phenol were, resp., 0.85, 0.88, 44, and 28 μg/L. The RSDs (n =4) for the analytes listed above were 6.2-14, 5.9-10, and 0.49-0.62% for the peak area, peak height, and migration time, resp. The compounds were extracted from paint-waste samples collected from shipyards using a silica-gel column. The extract was dissolved with acetonitrile containing 1% (volume/volume) pyridine. The samples were then analyzed using CZE, revealing resp. concentrations of 0.076-0.53, 0.015-0.36, 1.7-22, and 1.2-13 μg/g. The proposed FASI-CZE method is a simple and promising procedure that is expected to be useful for the determination of PTPB and its degradation products in paint wastes.

Analytical Sciences published new progress about 971-66-4. 971-66-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is Triphenyl(pyridin-1-ium-1-yl)borate, and the molecular formula is C23H20BN, COA of Formula: C23H20BN.

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