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• 95-55-6 2-amino-phenol 
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• 32085-88-4 3,5-difluorobenzaldehyde 

Relevant academic research and scientific papers

Diiridium Bimetallic Complexes Function as a Redox Switch to Directly Split Carbonate into Carbon Monoxide and Oxygen

A pair of diiridium bimetallic complexes exhibit a special type of oxidation-reduction reaction that could directly split carbonate into carbon monoxide and molecular oxygen via a low-energy pathway needing no sacrificial reagent. One of the bimetallic complexes, IrIII(μ-Cl)2IrIII, can catch carbonato group from carbonate and reduce it to CO. The second complex, the rare bimetallic complex IrIV(μ-oxo)2IrIV, can react with chlorine to release O2 by the oxidation of oxygen ions with synergistic oxidative effect of iridium ions and chlorine atoms. The activation energy needed for the key reaction is quite low (～20 kJ/mol), which is far less than the dissociation energy of the C=O bond in CO2 (～750 kJ/mol). These diiridium bimetallic complexes could be applied as a redox switch to split carbonate or combined with well-known processes in the chemical industry to build up a catalytic system to directly split CO2 into CO and O2.

Cyclometalated iridium(III)complexes with ligand effects on the catalytic C-H bond activation of toluene

New cyclometalated iridium(IIcomplexes have been designed, prepared and applied as catalytic systems for the C-H bond activation (CHof toluene through a clean, highly efficient, and environmentally friendly process. The complexes have the general formula [(C^N)2Ir(N^O)]. The C^N ligands are the monoanionic bidentate cyclometalating ligands 2-phenylpyridinato (ppy), 2-phenylbenzoxazolato (pbo), and 2-(3.5-difluorophenyl)-benzoxazolato (dfpbo). The (N^ligand is also a monoanionic bidentate cyclometalating ligand, namely picolinato (pic). The complexes [(ppy)2Ir(pic)] (1), [(pbo)2Ir(pic)] (2), and [(dfpbo)2-Ir(pic)] (3) were structurally characterized by1H and13C NMR spectroscopy, FAB-MS, and X-ray crystallography. The activation energies for the catalytic CHA oxidation of toluene when using complexes 1-3 as catalysts are quite low, between 14.4 and 25.5 kcal mol-1. The catalytic turnover frequencies (TOFare fairly high (up to 4.0 × 103 moltoluene molcatalyst-1 h-1) with excellent reliability and the turnover number (TOcan reach 2.40 × 104 moltoluene molcatalyst-1 after 6 h of reaction time. A combination of catalytic tests, DFT calculations, X-ray absorption nearedge structure (XANEanalysis, and kinetic modeling was used to derive detailed insights into the characteristics of the catalysts and their effect on the reactions featured in the CHA oxidation of toluene.

Nickel-catalyzed ligand-free synthesis of benzoxazoles and oxazolines via isocyanide insertion

A novel and efficient route to benzoxazoles and oxazolines involving a nickel-catalyzed three-component coupling reaction of iodobenzene, an amino alcohol and tert-butyl isocyanide has been developed. A wide array of products have been prepared in good to excellent yields in the absence of ligand.

Nano ceria catalyzed synthesis of substituted benzimidazole, benzothiazole, and benzoxazole in aqueous media

A series of substituted benzimidazoles, benzothiazoles, and benzoxazoles was synthesized by combining 1,2-phenylenediamine, 2-aminothiophenol, or 2-aminophenol with aryl, heteroaryl, aliphatic, α,β-unsaturated aldehydes in the presence of nano ceria (CeO2) as an efficient heterogeneous catalyst.

An 18+δ iridium dimer releasing metalloradicals spontaneously

Reductive elimination of a bridged chlorine from a diiridium(iii) core, [(dfpbo)2Ir(μ-Cl)]2 (dfpbo = 2-(3.5-difluorophenyl) benzoxazolato-N,C2), afforded an iridium dimer, [(fpbo) 2Ir]2(μ-Cl), showing an 18+δ structure with a bent bridge, which can release metalloradicals spontaneously in solution at room temperature.

Synthesis and characterization of cyclometalated iridium(III) complexes containing benzoxazole derivatives and different ancillary ligands

The synthesis, structures, electrochemistry, and photophysics of a series of cyclometalated iridium(III) complexes based on benzoxazole derivatives and different β-diketonate ligands are reported. These complexes have a general formula C∧N2Ir(LL′) [where C∧N is a monoanionic cyclometalating ligand; 2-phenylbenzoxazolato (pbo), 2-(4-chlorophenyl)benzoxazolato (cpbo), 2-phenyl-5-chlorobenzoxazolato (pcbo), 2-(3,5-difluorophenyl)benzoxazole (fpbo), or 2-(2-naphthyl)benzoxazolato (nbo), and LL′ is an ancillary ligand; acetylacetonate (acac), dibenzoylmethanate (dbm), or 1,1,1,5,5,5-hexafluoroacetylacetonate (hfacac)]. The complexes (pcbo)2Ir(acac) (3), (dfpbo)2Ir(acac) (4), (cpbo)2Ir(dbm) (7), (dfpbo)2Ir(dbm) (8), and (dfpbo)2Ir(hfacac) (9) have been structurally characterized by X-ray crystallography. All of the complexes show reversible oxidation between 0.45 and 1.07 V, versus Fc/Fc+, and have short luminescence lifetime (τ = 0.1-1.3 μs) at room temperature. Except complex 9, the radiative decay rate (kr) and nonradiative decay rate (knr) of the (C∧N)2Ir(LL′) complexes have been determined by using the lifetime and quantum efficiency. The kr ranges between 2.0 × 103 and 3.0 × 105 s-1 and knr spans a narrower range of values (5.0 × 105 to 7.0 × 106 s-1).

Biochemical and structural evaluation of highly selective 2-arylbenzoxazole-based transthyretin amyloidogenesis inhibitors

To develop potent transthyretin (TTR) amyloidogenesis inhibitors that also display high binding selectivity in blood, it proves useful to systematically optimize each of the three substructural elements that comprise a typical inhibitor: the two aryl rings and the linker joining them. In the first study, described herein, structural modifications to one aryl ring were evaluated by screening a library of 2-arylbenzoxazoles bearing thyroid hormone-like aryl substituents on the 2-aryl ring. Several potent and highly selective amyloidogenesis inhibitors were identified that exhibit minimal thyroid hormone nuclear receptor and COX-1 binding. High resolution crystal structures (1.3-1.5 ?) of three inhibitors (2f, 4f, and 4d) in complex with TTR were obtained to characterize their binding orientation. Collectively, the results demonstrate that thyroid hormone-like substitution patterns on one aryl ring lead to potent and highly selective TTR amyloidogenesis inhibitors that lack undesirable thyroid hormone receptor or COX-1 binding.