Tag: M.W=700-800

Jespersen, Daniel; Keen, Brockton; Day, Jon I.; Singh, Anuradha; Briles, Justin; Mullins, Duncan; Weaver, Jimmie D. published the artcile< Solubility of iridium and ruthenium organometallic photoredox catalysts>, HPLC of Formula: 370878-69-6, the main research area is solubility iridium ruthenium photoredox catalyst; Photocatalysis; heteroleptic; homoleptic; iridium; photocatalyst; photoredox; ruthenium; saturation; solubility; solvent.

Despite the exponential growth of the field of photocatalysis, for reasons that are not entirely clear, these precious photocatalysts are often used in the literature at loadings that exceed their maximum solubility On an industrial scale, the quantity of any precious-metal catalyst can be a substantial financial burden or a sourcing issue, not to mention concerns as to the ecol. and earth abundance of these catalysts. We believe that inattention to solubility has made these reactions appear less efficient than they actually are because much of the photocatalyst remains undissolved. Therefore, the maximum solubilities of iridium- and ruthenium-centered photocatalysts in industrially relevant solvents have been systematically identified. Furthermore, a literature photocatalytic reaction that our results suggested was beyond the maximum solubility has been revisited with interesting results.

Organic Process Research & Development published new progress about Photochemical redox reaction catalysts. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, HPLC of Formula: 370878-69-6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Uraguchi, Daisuke; Kinoshita, Natsuko; Kizu, Tomohito; Ooi, Takashi published the artcile< Synergistic Catalysis of Ionic Bronsted Acid and Photosensitizer for a Redox Neutral Asymmetric α-Coupling of N-Arylaminomethanes with Aldimines>, COA of Formula: C33H21F3IrN3, the main research area is aldimine arylaminomethane chiral arylaminophosphonium iridium enantioselective coupling visible light; aryl diamine stereoselective preparation; chiral arylaminophosphonium photosensitizer iridium enantioselective coupling synergistic catalyst.

A redox neutral, highly enantioselective coupling between N-arylaminomethanes and N-sulfonyl aldimines was developed by harnessing the efficient catalysis of P-spiro chiral arylaminophosphonium barfate and a transition-metal photosensitizer under visible light irradiation This mode of synergistic catalysis provides a powerful strategy for controlling the bond-forming processes of reactive radical intermediates.

Journal of the American Chemical Society published new progress about Aldimines Role: RCT (Reactant), RACT (Reactant or Reagent). 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, COA of Formula: C33H21F3IrN3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Arora, Amandeep; Weaver, Jimmie D. published the artcile< Photocatalytic Generation of 2-Azolyl Radicals: Intermediates for the Azolylation of Arenes and Heteroarenes via C-H Functionalization>, HPLC of Formula: 370878-69-6, the main research area is carbon hydrogen bond activation arylation photocatalysis.

The 2-azolyl radical, generated from 2-bromoazoles via photocatalysis, is a powerful intermediate for the intermol. arylation of unmodified (hetero)arenes. The reaction is characterized by mild conditions, operational simplicity, tolerance toward functional and sterically demanding groups, broad scope, and anti-Minisci selectivity. A working mechanism is provided, and a low-solubility amine is essential for successful coupling. The utility of the reaction is demonstrated via late-stage functionalization of Me estrone and application toward other bromoarenes.

Organic Letters published new progress about C-H bond activation. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, HPLC of Formula: 370878-69-6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Singh, Anuradha; Teegardin, Kip; Kelly, Megan; Prasad, Kariate S.; Krishnan, Sadagopan; Weaver, Jimmie D. published the artcile< Facile synthesis and complete characterization of homoleptic and heteroleptic cyclometalated Iridium(III) complexes for photocatalysis>, Application of C33H21F3IrN3, the main research area is iridium complex photocatalyst synthesis.

This study describes an improved synthesis for homoleptic iridium(III) 2-phenylpyridine based photocatalysts that allows rapid access to these compounds in good to high yields which have recently become a vital component within the field of catalysis. A number of heteroleptic iridium(III) 2-phenylpyridine photocatalysts are synthesized and studied for their photophys. and electrochem. properties. The emission energies span the range of 473-560 nm and reduction potentials from -2.27 V to -1.23 V and oxidation potentials ranging from 1.81 V to 0.69 V. This study provides the calculated excited state properties and comment on the role of these properties in designing catalytic cycles.

Journal of Organometallic Chemistry published new progress about Photocatalysis. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Application of C33H21F3IrN3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Day, Jon I.; Singh, Kamaljeet; Trinh, Winston; Weaver, Jimmie D. published the artcile< Visible Light Mediated Generation of trans-Arylcyclohexenes and Their Utilization in the Synthesis of Cyclic Bridged Ethers>, Name: Ir(p-F-ppy)3, the main research area is visible light mediated generation trans arylcyclohexene; cyclic bridged ether preparation reaction mechanism hydrogen bonding.

While accessible via UV-irradiation of cis-cyclohexene, trans-cyclohexene has thus far been an investigation driven by curiosity, and due primarily to its short lifespan, has until recently not been employed for productive synthesis. Herein, we present straightforward conditions that provide access to a class of trans-arylcyclohexenes and demonstrate their utility in the formation of oxabicyclic ethers, which are otherwise inaccessible from the corresponding cis-cyclohexene. A key challenge to utilizing the incredible ca. 52 kcal/mol strain energy of trans-cyclohexene to drive synthesis was overcoming its short lifetime. Herein, we show that preorganization via hydrogen bonding between the substrate and the reaction partner prior to isomerization is a viable strategy to overcome the inherently short lifetime of trans-cyclohexene.

Journal of the American Chemical Society published new progress about Bridged bicyclic compounds Role: SPN (Synthetic Preparation), PREP (Preparation). 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Name: Ir(p-F-ppy)3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Kizu, Tomohito; Uraguchi, Daisuke; Ooi, Takashi published the artcile< Independence from the Sequence of Single-Electron Transfer of Photoredox Process in Redox-Neutral Asymmetric Bond-Forming Reaction>, Name: Ir(p-F-ppy)3, the main research area is enantioselective coupling arylaminomethane methanesulfonylaldimine iridium photosensitizer.

A catalytic cycle initiated by the oxidative quenching of the excited photosensitizer (Ir*(ppy)3) is established for the enantioselective coupling between (N-arylamino)methanes and (N-methanesulfonyl)aldimines catalyzed by Ir-based photosensitizer and a chiral (arylamino)phosphonium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate under visible light irradiation This achievement clearly demonstrates the insensitivity of this redox-neutral asym. reaction to the sequence of the key redox events involved in the synergistic catalysis.

Journal of Organic Chemistry published new progress about Aldimines Role: RCT (Reactant), RACT (Reactant or Reagent). 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Name: Ir(p-F-ppy)3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Lepeltier, Marc; Dumur, Frederic; Marrot, Jerome; Contal, Emmanuel; Bertin, Denis; Gigmes, Didier; Mayer, Cedric R. published the artcile< Unprecedented combination of regioselective hydrodefluorination and ligand exchange reaction during the syntheses of tris-cyclometalated iridium(III) complexes>, Computed Properties of 370878-69-6, the main research area is fluoropyridine cyclometalated iridium complex preparation unprecedented regioselective hydrodefluorination ligand; crystal mol structure tris fluoropyridine cyclometalated iridium complex.

The first reported combination of regioselective hydro-defluorination and a ligand exchange reaction during the syntheses of neutral iridium(III) complexes is presented. Surprisingly, loss of one fluorine atom per ligand combined with a complete ligand exchange reaction on the transition metal were jointly observed during a bridge-splitting and substitution reaction of two different dimeric iridium(III) precursor complexes with two different ancillary ligands. The regioselectivity of defluorination was evidenced in both cases. The reaction time was identified as a factor strongly impacting the kinetics of the thermally induced reaction.

Dalton Transactions published new progress about Coordinative substitution reaction. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Computed Properties of 370878-69-6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Leibler, Isabelle Nathalie-Marie; Tekle-Smith, Makeda A.; Doyle, Abigail G. published the artcile< A general strategy for C(sp3)-H functionalization with nucleophiles using methyl radical as a hydrogen atom abstractor>, Recommanded Product: Ir(p-F-ppy)3, the main research area is hydrocarbon triethylamine hydrogen fluoride iridium catalyst photochem fluorination reaction; hydrofluorocarbon preparation; difluorodiphenylmethane nucleophile iridium catalyst photochem carbon hydrogen functionalization; carbon functionalized difluorodiphenylmethane preparation.

A strategy that transforms C(sp3)-H bonds into carbocations via sequential hydrogen atom transfer (HAT) and oxidative radical-polar crossover were discussed. The resulting carbocation was functionalized by a variety of nucleophiles-including halides, water, alcs., thiols, an electron-rich arene and an azide-to effect diverse bond formations. Mechanistic studies indicated that HAT was mediated by Me radical-a previously unexplored HAT agent with differing polarity to many of those used in photoredox catalysis-enabling new site-selectivity for late-stage C(sp3)-H functionalization.

Nature Communications published new progress about Bond activation catalysts. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Recommanded Product: Ir(p-F-ppy)3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Koseki, Shiro; Yoshinaga, Harunobu; Asada, Toshio; Matsushita, Takeshi published the artcile< Spin-orbit coupling analyses of phosphorescent processes in Ir(Zppy)3 (Z = NH2, NO2 and CN)>, Reference of 370878-69-6, the main research area is tris phenylpyridinato iridium complex phosphorescent process spin orbit coupling.

Substituent effects of NH2, NO2 and CN groups on phosphorescence in fac-tris(2-phenylpyridinato)iridium(III) [fac-Ir(ppy)3] were examined theor. by using the multiconfiguration SCF (MCSCF) method together with the SBKJC basis sets augmented by a set of polarization functions, followed by second-order CI (SOCI) and spin-orbit coupling (SOC) calculations, while time-dependent d. functional theory (TD DFT) calculations provided too long wavelengths for phosphorescent peaks at the geometries optimized for triplet states even though the TD DFT predictions were qual. good with respect to relative spectral shifts. The strongest electron-donating substituent NH2 and the strongest electron-withdrawing substituents, NO2 and CN, were chosen for investigation of the substituent effects in the present investigation. It was found that when these electron-withdrawing substituents are introduced into the Z5 sites, the largest blue shift is obtained for the emission spectra, while the introduction of the electron-donating NH2 substituent causes a red shift of the emission spectra. This is because the Z5 site has non-negligible coefficients in the HOMO (HOMO) and can interact with the π* orbitals of the substituents. This interaction makes the HOMO lower in energy. This is the reason why a large blue shift of the emission peak is obtained when one of these substituents is introduced to the Z5 sites. Based on the results of the calculation, it can be said that the best material for blue-color emission is tris(5-nitro-2-phenylpyridinato) iridium(III) [fac-Ir(5-NO2ppy)3] or tris(5-nitro-4,6-difluoro-2-phenylpyridinato)iridium(III) [fac-Ir(5-NO2-4,6-dfppy)3]. If the reactivity of the NO2 substituent in the lowest triplet state becomes troublesome in the synthesis processes and/or if it is difficult to choose host mols. for an emissive layer, tris(5-cyano-3,4,6-trifluoro-2-phenylpyridinato)iridium(III) [fac-Ir(5-CN-3,4,6-tfppy)3] would be the most appropriate for blue-color emission.

RSC Advances published new progress about Bond angle. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Reference of 370878-69-6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Singh, A.; Fennell, C. J.; Weaver, J. D. published the artcile< Photocatalyst size controls electron and energy transfer: selectable E/Z isomer synthesis via C-F alkenylation>, Quality Control of 370878-69-6, the main research area is alkyne fluoroarene iridium photocatalyst selective alkenylation; alkene preparation isomerization.

A model was developed en route to a photocatalytic Caryl-F alkenylation reaction of alkynes and highly-fluorinated arenes as partners. By judicious choice of photocatalyst, access to E- or Z-olefins was accomplished, even in the case of synthetically challenging trisubstituted alkenes. The generality and transferability of this model was tested by evaluating established photocatalytic reactions, resulting in shortened reaction times and access to complimentary Z-cinnamylamines in the photocatalytic [2+2] and C-H vinylation of amines, resp. These results showed that, taking into account the size of the photocatalyst provides predictive ability and control in photochem. quenching events.

Chemical Science published new progress about Alkenes Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Quality Control of 370878-69-6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem