- Synthesis of Dibenzofurans by Cu-Catalyzed Deborylative Ring Contraction of Dibenzoxaborins
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An efficient transformation of dibenzoxaborins to dibenzofurans by deborylative ring contraction was achieved under mild conditions using a copper catalyst. The method showed a broad substrate scope enabling the preparation of various dibenzofurans, including those bearing a functional group. The ready availability of various dibenzoxaborins enhances the utility of this method, as demonstrated by the regiodivergent synthesis of dibenzofurans.
- Sumida, Yuto,Harada, Ryu,Sumida, Tomoe,Johmoto, Kohei,Uekusa, Hidehiro,Hosoya, Takamitsu
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supporting information
p. 6687 - 6691
(2020/09/02)
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- Palladium (II)–Salan Complexes as Catalysts for Suzuki–Miyaura C–C Cross-Coupling in Water and Air. Effect of the Various Bridging Units within the Diamine Moieties on the Catalytic Performance
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Water-soluble salan ligands were synthesized by hydrogenation and subsequent sulfonation of salens (N,N’-bis(slicylidene)ethylenediamine and analogues) with various bridging units (linkers) connecting the nitrogen atoms. Pd (II) complexes were obtained in reactions of sulfosalans and [PdCl4]2?. Characterization of the ligands and complexes included extensive X-ray diffraction studies, too. The Pd (II) complexes proved highly active catalysts of the Suzuki–Miyaura reaction of aryl halides and arylboronic acid derivatives at 80 ?C in water and air. A comparative study of the Pd (II)–sulfosalan catalysts showed that the catalytic activity largely increased with increasing linker length and with increasing steric congestion around the N donor atoms of the ligands; the highest specific activity was 40,000 (mol substrate) (mol catalyst × h)?1. The substrate scope was explored with the use of the two most active catalysts, containing 1,4-butylene and 1,2-diphenylethylene linkers, respectively.
- Bunda, Szilvia,Joó, Ferenc,Kathó, ágnes,Udvardy, Antal,Voronova, Krisztina
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supporting information
(2020/09/18)
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- COMPOUND AND ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME
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The present invention provides a compound represented by chemical formula 1 and an organic light emitting device comprising the same. The organic light emitting device according to the present invention has excellent lifespan characteristics and high luminous efficiency even at a low driving voltage.COPYRIGHT KIPO 2020
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Paragraph 0149-0153
(2020/07/28)
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- COMPOUND AND ORGANIC LIGHT EMITTING DEVICE COMPRISING THE SAME
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The present invention provides a compound of chemical formula 1 and an organic light emitting device comprising the same. The organic light emitting device containing the compound has excellent lifespan characteristics and can have high luminous efficiency even at a low driving voltage.COPYRIGHT KIPO 2020
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Paragraph 0183-0187
(2020/07/29)
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- Highly-chemoselective step-down reduction of carboxylic acids to aromatic hydrocarbons: Via palladium catalysis
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Aryl carboxylic acids are among the most abundant substrates in chemical synthesis and represent a perfect example of a traceless directing group that is central to many processes in the preparation of pharmaceuticals, natural products and polymers. Herein, we describe a highly selective method for the direct step-down reduction of carboxylic acids to arenes, proceeding via well-defined Pd(0)/(ii) catalytic cycle. The method shows a remarkably broad substrate scope, enabling to direct the classical acyl reduction towards selective decarbonylation by a redox-neutral mechanism. The utility of this reaction is highlighted in the direct defunctionalization of pharmaceuticals and natural products, and further emphasized in a range of traceless processes using removable carboxylic acids under mild, redox-neutral conditions orthogonal to protodecarboxylation. Extensive DFT computations were conducted to demonstrate preferred selectivity for the reversible oxidative addition and indicated that a versatile hydrogen atom transfer (HAT) pathway is operable.
- Liu, Chengwei,Qin, Zhi-Xin,Ji, Chong-Lei,Hong, Xin,Szostak, Michal
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p. 5736 - 5742
(2019/06/18)
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- Compound containing dibenzofuran structure and application thereof
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The invention belongs to the field of organic electroluminescent materials and discloses a compound containing a dibenzofuran structure and application thereof. The compound of the invention has a structure as shown in the general formula (I). By applying
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Paragraph 0056-0058
(2018/11/27)
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- Organic semiconductor material and luminescent device
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The invention belongs to the technical field of electroluminescent materials, and discloses an organic semiconductor material and a luminescent device. The organic semiconductor material comprises atleast one substrate material and at least one doping mat
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Paragraph 0100-0102
(2019/01/14)
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- Blue fluorescence dopant compound and organic electroluminescent device using the same
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A blue fluorescence dopant is characterized by the following structural formula: in which R1, R2, R3, R4, R5 and R6 are, each independently, selected from, a hydrogen atom, a C1-C10 linear or branched alkyl group, a C1-C20 linear or branched alkyl group, a substituted or unsubstituted N-(phenylmethyl)imino group, a phenyl group, phenylamine, diphenylamine, phenyl pyridinylamine, bipyridinylamine, phenyl naphthylamine, binaphthylamine, phenyl phenanthrylamine, biphenanthrylamine, phenyl anthrylamine, bianthrylamine, phenanthridine, biphenyl, a pyridinyl group, a pyrimidinyl group, a quinolyl group and a triazinyl group. The blue fluorescence dopant disclosed in the present invention may facilitate to lower driving voltage and increase efficiency, brightness, heat stability, color purity, lifetime, etc. Further, an organic electroluminescent device using the blue fluorescence dopant has excellent performances of high efficiency and long lifetime.
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Page/Page column 131
(2018/04/19)
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- Blue fluorescence-doped substance and organic electroluminescence device comprising blue fluorescence-doped substance
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The invention provides a blue fluorescence-doped substance. The substance is characterized in that the structural formula is as shown in the specification. In the formula, R1, R2, R3, R4, R5 and R6 are respectively and independently selected from hydrogen, C1-C10 linear alkyl or branched alkyl, C1-C20 linear alkyl or branched alkyl, substituted or non-substituted N-benzoylamine, phenyl, aniline, diphenylamine, benzyl pyridylamine, bipyridine amine, benzene naphthylamine, dinaphthylamine, benzene phenanthrenamine, biphenanthrenamine, benzanthryl amine, bi-anthryl amine, phenanthridine, biphenyl, pyridyl, pyrimidyl, quinolyl or triazinyl. The blue fluorescence-doped substance disclosed by the invention can achieve the effects of reducing the drive voltage, improving the efficiency, brightness, thermal stability, color purity and service life, and the like. In addition, the organic electroluminescence device manufactured by using the blue fluorescence-doped substance has excellent performances of high efficiency and long service life.
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Paragraph 0363-0368
(2018/04/26)
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- ORGANIC LIGHT-EMITTING DIODE WITH HIGH EFFICIENCY
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Disclosed herein is an organic light-emitting diode, comprising: a first electrode; a second electrode facing the first electrode; and an electron-blocking layer and a light-emitting layer sequentially interposed between the first electrode and the second electrode, wherein the light-emitting layer comprises at least one of the amine compounds represented by the following Chemical Formula A or B, and the electron-blocking layer comprises the compound represented by the following Chemical Formula C. Chemical Formulas A, B and C are as described in the Specification.
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Paragraph 0160-0161
(2017/06/12)
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- Pd-catalyzed Suzuki–Miyaura cross-coupling of [Ph2SR][OTf] with arylboronic acids
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The Pd-catalyzed Suzuki–Miyaura cross-coupling of alkyl- and fluoroalkyl(diphenyl)sulfonium triflates with arylboronic acids was compared. The fluorine substitution on the alkyl groups of [Ph2SR][OTf] had a big influence on the reaction. Perfluoroalkyl(diphenyl)sulfonium triflates (2b–d) were unsuccessful participants in the Pd-catalyzed phenylation of arylboronic acid under the standard conditions because of the strong electronegativity of the long-chain perfluoroalkyl groups, which underwent S[sbnd]Rfnbond cleavage instead. Polyfluoroalkyl(diphenyl)sulfonium triflates (2f–h) reacted with arylboronic acid to afford the phenylation product in very low yields due to the tendency of deprotonation and β-F elimination of the sulfonium salts. Eventually, (2,2,2-trifluoroethyl)diphenylsulfonium triflate (2e), methyl- or ethyl(diphenyl)sulfonium triflate (2i or 2j), and triphenylsulfonium triflate (2m) were found to be more effective reagents than other tested phenylsulfounium salts for Pd-catalyzed phenylation, which provided much higher yields of the desired products under mild conditions.
- Wang, Xiao-Yan,Song, Hai-Xia,Wang, Shi-Meng,Yang, Jing,Qin, Hua-Li,Jiang, Xin,Zhang, Cheng-Pan
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p. 7606 - 7612
(2016/11/11)
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- Benzo[c]phenanthrene derivative with electron donor-acceptor structure and application thereof and electroluminescent device
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The invention belongs to the field of photoelectric material application science and technology, and particularly relates to a benzo[c]phenanthrene derivative with an electron donor-acceptor structure and application thereof and an electroluminescent device. The derivative takes benzo[c]phenanthrene as a core, and by linking different aromatic amine groups to different sites of the benzo[c]phenanthrene in a key mode or changing a bridged structure, an efficient fluorescence material with the double polarity is formed. The material has the advantages that the stability and conjugacy of large aromatic rings of the benzophenanthrene are utilized, distribution of electron clouds on the molecules is adjusted through the periphery groups, and therefore luminescent property can be effectively adjusted.
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Paragraph 0034; 0035; 0046; 0047
(2016/10/09)
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- Novel heteroleptic iridium complexes
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Novel phosphorescent heteroleptic iridium complexes with phenylpyridine and dibenzo-containing ligands are provided. The disclosed compounds have low sublimation temperatures that allow for ease of purification and fabrication into a variety of OLED devices.
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- Rhodium-catalyzed decarbonylative C-H arylation of 2-aryloxybenzoic acids leading to dibenzofuran derivatives
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Rhodium-catalyzed intramolecular C-H arylation of 2-aryloxybenzoic acids proceeded accompanied by decarbonylation to give dibenzofuran derivatives in high yields. The present reaction is widely applicable to substrates bearing various functionalities.
- Maetani, Shinji,Fukuyama, Takahide,Ryu, Ilhyong
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p. 2754 - 2757
(2013/07/19)
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- NOVEL COMPOUNDS FOR ORGANIC ELECTRONIC MATERIAL AND ORGANIC ELECTROLUMINESCENT DEVICE USING THE SAME
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The present invention relates to a novel compound and an organic electroluminescent device containing the same. The compound according to the present invention has an advantage in manufacturing an organic electroluminescent device which has high luminous efficiency and a long operation lifetime.
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Page/Page column 16
(2012/11/06)
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- Oxidative cyclization of 2-arylphenols to dibenzofurans under Pd(II)/peroxybenzoate catalysis
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2-Arylphenols undergo intramolecular C-H bond activation/C-O bond formation to afford dibenzofuran derivatives under palladium catalysis in the presence of tert-butyl peroxybenzoate as an oxidant. Kinetic isotope effect experiments indicated that C-H bond cleavage is the rate-limiting step of the reaction.
- Wei, Ye,Yoshikai, Naohiko
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supporting information; experimental part
p. 5504 - 5507
(2011/12/05)
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- METHOD FOR THE PRODUCTION OF 4,4'-[1-TRIFLUOROMETHYL)ALKYLIDENE]-BIS-(2,6-DIPHENYLPHENOLS)
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The present invention relates to a process for preparing 4,4′-[1-(trifluoromethyl)alkylidene]bis(2,6-diphenylphenols), in particular for preparing 4,4′-[1-(trifluoromethyl)ethylidene]bis(2,6-diphenylphenol), which comprises the self-condensation of cyclohexanone in the presence of a basic catalyst to form tricyclic condensation products, dehydrogenation of the resulting tricyclic condensation products in the presence of a supported transition metal catalyst in the condensed phase to form 2,6-diphenylphenol and reaction of the 2,6-diphenylphenol with a trifluoromethyl ketone. The invention further provides an improved process for preparing 2,6-diphenylphenol by aldol self-condensation of cyclohexanone.
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Page/Page column 10
(2010/12/29)
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- Microwave-assisted Suzuki coupling reactions with an encapsulated palladium catalyst for batch and continuous-flow transformations
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This article describes the design, optimisation and development of a Suzuki cross-coupling protocol mediated by an efficient palladium-en-capsulated catalyst (Pd EnCat) under microwave irradiation. The methodology has been used in both batch mode for classical library preparation and in continuous-flow applications furnishing multigram quantities of material. Described is a method that uses direct focused microwave heating whilst applying an external cooling source. This enables a lower than normal bulk temperature to be maintained throughout the reaction period leading to significant improvements in the overall yield and purity of the reaction products. Additional aspects of this novel heating protocol are discussed in relation to the prolonged lifetime and enhanced reactivity of the immobilised catalyst system.
- Baxendale, Ian R.,Griffiths-Jones, Charlotte M.,Ley, Steven V.,Tranmer, Geoffrey K.
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p. 4407 - 4416
(2008/02/07)
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