Tag: M.W=700-800

Wang, Wenqi; Zhou, Zefeng; Sathe, Devavrat; Tang, Xuanting; Moran, Stephanie; Jin, Jing; Haeffner, Fredrik; Wang, Junpeng; Niu, Jia published the artcile< Degradable Vinyl Random Copolymers via Photocontrolled Radical Ring-Opening Cascade Copolymerization>, Formula: C33H21F3IrN3, the main research area is vinyl random copolymer photocontrolled radical ring opening cascade copolymerization; Cascade polymerization; Degradable polymer; Photocontrolled polymerization; Random copolymer; Reaction mechanism.

Degradable vinyl polymers by radical ring-opening polymerization are promising solutions to the challenges caused by non-degradable vinyl plastics. However, achieving even distributions of labile functional groups in the backbone of degradable vinyl polymers remains challenging. Herein, we report a photocatalytic approach to degradable vinyl random copolymers via radical ring-opening cascade copolymerization (rROCCP). The rROCCP of macrocyclic allylic sulfones and acrylates or acrylamides mediated by visible light at ambient temperature achieved near-unity comonomer reactivity ratios over the entire range of the feed compositions Exptl. and computational evidence revealed an unusual reversible inhibition of chain propagation by in situ generated sulfur dioxide (SO2), which was successfully overcome by reducing the solubility of SO2. This study provides a powerful approach to degradable vinyl random copolymers with comparable material properties to non-degradable vinyl polymers.

Angewandte Chemie, International Edition published new progress about Complex modulus, tan δ. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Formula: C33H21F3IrN3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Dedeian, K.; Djurovich, P. I.; Garces, F. O.; Carlson, G.; Watts, R. J. published the artcile< A new synthetic route to the preparation of a series of strong photoreducing agents: fac-tris-ortho-metalated complexes of iridium(III) with substituted 2-phenylpyridines>, Related Products of 370878-69-6, the main research area is photoreducing agent phenylpyridine iridium complex; pyridylbenzene iridium complex.

Reaction of 2-phenylpyridine (Hppy) with Ir(acac)3 (acac = acetylacetonato) in refluxing glycerol gives the fac-tris-ortho-metalate of Ir(III), fac-Ir(ppy)3 in high yield (45%). Phenyl-ring-substituted derivatives of 2-phenylpyridine (R-Hppy) were prepared by cross-coupling of 2-bromopyridine with substituted bromobenzenes. These react with Ir(acac)3 in a manner analogous to Hppy to give similarly high yields (40-75%) of their resp. tris-ortho-metalates, fac-Ir(R-ppy)3.

Inorganic Chemistry published new progress about Electrochemistry. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Related Products of 370878-69-6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Peez, Theodor; Schmalz, Veronika; Harms, Klaus; Koert, Ulrich published the artcile< Synthesis of Naphthocyclobutenes from α-Naphthyl Acrylates by Visible-Light Energy-Transfer Catalysis>, Category: pyridine-derivatives, the main research area is naphthocyclobutene stereoselective preparation; iridium photocatalyst stereoselective photocyclization naphthylacrylate; visible light energy transfer catalysis stereoselective photocyclization naphthylacrylate.

Me (α-naphthyl)acrylates bearing an ortho-substituent with a hydrogen atom such as I produce naphthocyclobutenes such as II by photocyclization in the presence of the iridium photocatalyst Ir(Fppy)3 under blue LED irradiation This reaction can be described as a carbon analog of the Norrish-Yang reaction; upon triplet excitation of the acrylate, 1,5-hydrogen atom transfer occurs to form a 1,4-diradical which cyclizes to form a cyclobuta-fused arene. In five of six cases where stereoselectivity was possible, the products were formed with diastereoselectivities up to >20:1.

Organic Letters published new progress about Cyclization catalysts, stereoselective (photo-). 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Grushin, Vladimir V.; Herron, Norman; LeCloux, Daniel D.; Marshall, William J.; Petrov, Viacheslav A.; Wang, Ying published the artcile< New, efficient electroluminescent materials based on organometallic Ir complexes>, Product Details of C33H21F3IrN3, the main research area is crystal structure iridium cyclometalated fluorinated arylpyridine complex; mol structure iridium cyclometalated fluorinated arylpyridine complex; electroluminescent fluorinated organometallic iridium compound preparation; LED photoluminescence luminescence iridium cyclometalated fluorinated arylpyridine complex; reduction potential cyclometalated fluorinated iridium arylpyridine complex; oxidation potential cyclometalated fluorinated iridium arylpyridine complex; fluorinated cyclometalated arylpyridine iridium complex preparation electroluminescent property; phenylpyridine cyclometalated fluorinated iridium complex preparation electroluminescent property; pyridine phenyl cyclometalated fluorinated iridium complex preparation electroluminescent property.

Reaction of aqueous IrCl3 with fluorinated 2-arylpyridines in the presence of AgO2CCF3 afforded fifteen fac-tris-cyclometalated arylpyridine Ir complexes (e.g., I) exhibiting excellent processing and electroluminescent properties which can be fine-tuned via systematic control of the nature and position of the substituents on the aromatic rings. Single-crystal x-ray structures were obtained for I and three other analogous cyclometalated arylpyridine Ir complexes. Nearly all the arylpyridine Ir complexes exhibited fully reversible reduction and oxidation waves.

Chemical Communications (Cambridge, United Kingdom) published new progress about Crystal structure. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Product Details of C33H21F3IrN3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

D’Andrade, Brian W.; Datta, Shubhashish; Forrest, Stephen R.; Djurovich, Peter; Polikarpov, Eugene; Thompson, Mark E. published the artcile< Relationship between the ionization and oxidation potentials of molecular organic semiconductors>, Recommanded Product: Ir(p-F-ppy)3, the main research area is oxidation potential mol organic semiconductor HOMO.

A relation between the energy of the HOMO and the oxidation potential of mol. organic semiconductors is presented. Approximating mols. as dipoles consisting of a pos. charged ion core surrounded by an electron cloud, the HOMO energy (EHOMO) is calculated as that required to sep. these opposite charges in a neutral organic thin film. Also, an anal. of image charge forces on spherical mols. positioned near a conductive plane formed by the electrode in an electrochem. cell is shown to explain the observed linear relation between EHOMO and the oxidation potential. The EHOMO’s of a number of organic semiconductors commonly employed in thin film electronic devices were determined by UPS, and compared to the relative oxidation potential (VCV) measured using pulsed cyclic voltammetry, leading to the relation EHOMO = -(1.4 ± 0.1) × (qV CV) – (4.6 ± 0.08) eV, consistent with theor. predictions.

Organic Electronics published new progress about Cyclic voltammetry. 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

Singh, Kamaljeet; Trinh, Winston; Weaver, Jimmie D. published the artcile< Elusive thermal [2+2] cycloaddition driven by visible light photocatalysis: tapping into strain to access C2-symmetric tricyclic rings>, HPLC of Formula: 370878-69-6, the main research area is thermal cycloaddition visible light photocatalysis strain sym tricyclic ring.

A mild and operationally simple methodol. is reported for the synthesis of cyclobutane rings imbedded within a C2-sym. tricyclic framework. The method uses visible light and an iridium-based photocatalyst to drive the oft-stated “”forbidden”” thermal [2 + 2] cycloaddition of cycloheptenes and analogs. Importantly, it generates cyclobutane with four new stereocenters with excellent stereoselectivity, and perfect regioselectivity. The reaction is propelled forward when the photocatalyst absorbs a visible light photon, which transfers this energy to the cycloheptene. Key to success is, upon excitation to the triplet via sensitization from the photocatalyst, the double bond isomerizes to give the transient, highly strained, trans-cycloheptene. The trans-cycloheptene undergoes a strain relieving thermal, intermol. [π2s + π2a] cycloaddition with another cis-cycloheptene. X-ray anal. reveals that the major product is the head-to-head, C2-sym. all trans-cyclobutane. Addnl., a dramatic display structural complexity enhancement is observed with the use of chiral cycloheptenols possessing one stereocenter, which results in the formation of cyclobutanes with six contiguous stereocenters with good to excellent diastereocontrol, and can be used to isolate single stereoisomers of stereochem. complex cyclobutanes in good yield.

Organic & Biomolecular Chemistry published new progress about Cis-trans isomerization. 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

Lantz, Erik; El Mokadem, Roukaya; Schoch, Tim; Fleske, Tyler; Weaver, Jimmie D. III published the artcile< A new twist for Stork-Danheiser products enabled by visible light mediated trans-cyclohexene formation; access to acyclic distal enones>, Related Products of 370878-69-6, the main research area is acyclic distal enone preparation; cycloalkenol ring opening isomerization photocatalyst.

Herein, the use of visible light to indirectly drive ring opening in unstrained 6- and 7-membered ring systems via reaction with a transiently generated trans-cycloalkene was investigated. Identification of conditions that captured visible light energy in the form of ring strain was key to success. Under mildly acidic conditions, cycloalkenols were shown to undergo formally endothermic ring-opening isomerization to give acyclic exo-methylene and distal ketones or aldehydes in high yields. Ultimately, this work demonstrated the ability of cycloalkenes to capture visible light energy and its use to drive both kinetically and thermally unfavorable rearrangements.

Chemical Science published new progress about Cycloalkenols 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, Related Products of 370878-69-6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Donald, James R.; Berrell, Sophie L. published the artcile< Radical cyanomethylation via vinyl azide cascade-fragmentation>, Related Products of 370878-69-6, the main research area is azido alkenol alkyl nucleophile tandem radical photochem cyanomethylation; alkanenitrile preparation.

A novel methodol. for radical cyanomethylation was described. The process was initiated by radical addition to the vinyl azide reagent 3-azido-2-methylbut-3-en-2-ol which triggered a cascade-fragmentation mechanism driven by the loss of dinitrogen and the stabilized 2-hydroxypropyl radical, ultimately effecting cyanomethylation. Cyanomethyl group was efficiently introduced into a range of substrates via trapping of α-carbonyl, heterobenzylic, alkyl, sulfonyl and aryl radicals, generated from a variety of functional groups under both photoredox catalysis and non-catalytic conditions. The value of this approach was exemplified by the late-stage cyanomethylation of pharmaceuticals.

Chemical Science published new progress about Aliphatic nitriles Role: PRP (Properties), 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, Related Products of 370878-69-6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem