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Jillella, Raveendra,Oh, Dong hwan,Oh, Chang Ho The Royal Society of Chemistry 2018 NEW JOURNAL OF CHEMISTRY Vol.42 No.20
<P>A simple, mild, efficient and chemoselective catalytic method for the straightforward synthesis of an interesting class of 2-aryl/alkyl-substituted-3-diaryl indolyl methanes in high yield is reported. This atom-efficient method proceeds <I>via</I> a gold-catalyzed one-pot sequential intramolecular hydroamination (C-N bond formation) of 2-alkynylanilines followed by a 1,6-conjugate addition to <I>p</I>-quinonemethides. The <I>p</I>-quinonemethides, which contain aldehyde functional groups, preferentially participate in 1,6-conjugate addition, while the aldehyde functional group remains unreactive.</P>
Synthesis of Monodisperse Naphthalene Dendrons for the Application of Dendrimers
Raveendra Jillella,김재웅,김건희,한진욱,오창호 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.9
Syntheses of dendrons for dendrimer applications are described using napthyl and urethane derivatives. The napthol, 1-(3-hydroxy-6-(methoxymethoxy)naphthalen-1-yl)ethan-1-one (h), was synthesized by employing Au-catalyzed cyclization of the corresponding propargylic carboxylates. Polynapthol dendrons (i, j, k, and l) were prepared from substitution reactions of napthyl derivative h with alkyl/aryl halides under basic conditions. Branched polyurethane compounds (q, r, and s) were also prepared from addition reactions of 1,3,5-tris(6-isocyanteohexyl)-1,3,5-triazine-2,4,6-trione (p) with various alcohols under Lewis acidic conditions. The photophysical properties of the synthesized compounds h, k, and j were studied.
이규환,Raveendra Jillella,김재웅,오창호 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.5
Propargylic pivaloates bearing an alkynyl group at a three?carbon tether under the gold catalysis would undergo [3,3] rearrangements of propargylic pivaloates followed by tandem [2+2] cyclization to give the corresponding 6?acylbicyclo[3,2,0]hept?6?ens. In continuing work, we prepared various substrates bearing two arms of alkyne?propargylic pivaloates to explore primitive dendrimer concept bicyclic compounds. Finally, we could obtain a series of diasteromeric compounds bearing two arms of 6?acylbicyclo[3,2,0]hept?6?ene groups in high yields.
Fabrication of Phosphorescence WOLED Based on Dimeric Phenoxazine Moiety for Hole Injection Layer
박민진,( Raveendra Jillella ),박종욱 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Hole injection material, namely, 10,10_-bis(4-tert-butylphenyl)-N7, N7_-di(naphthalen-1-yl)-N7,N7_-diphenyl-10H,10_H-3,3_-biphenoxa zine-7,7_-diamine (1-PNA-BPBPOX), were adapted to white OLED devi ces for solution process. White devices were fabricated using a multilay er emission structure, consisting of a single host layer. The red phospho rescent, (Ir(piq)3_, and the blue phosphorescent,(FIrpic), are doped into separate layers of (mCP) host. The FIrpic and Ir(piq)3 guest molecules are directly excited by direct recombination on these molecules. When the device with BPBPOX was compared to the device with PEDOT:PSS, a commercialized solution HIL material, the luminance efficiency was 6.37 cd/A for BPBPOX and 0.66 cd/A for PEDOT:PSS for the optimized white device structure, showing 10 times as high efficiency.
민동주,Raveendra Jillella,박상신,강석우,박수영,박종욱 한국고분자학회 2021 Macromolecular Research Vol.29 No.12
A new electrical small molecule and polymers with electron-withdrawing effects stemming from a tetrazine moiety were synthesized. The electro-optical properties of 3-([1,1'-biphenyl]-3-yl)-6-(4-(tert-butyl)phenyl)-1,2,4,5-tetrazine (TBTTZ- DP), poly(9-ethyl-3-(4-(6-phenyl-1,2,4,5-tetrazin-3-yl)phenyl)-9H-carbazole) (ECBZ-TTZ), and poly(9-(henicosan-11-yl)-3-(3-(6-phenyl-1,2,4,5-tetrazin-3-yl)phenyl)- 9H-carbazole) (DCBZ-TTZ) were compared. TB-TTZ-DP, ECBZ-TTZ, and DCBZTTZ in the solution state exhibited maximum absorption wavelengths of 309, 312, and 321 nm, respectively; in the film state, they exhibited maximum absorption wavelengths of 308, 341, and 302 nm, respectively. These results correspond to bandgaps of 3.63, 3.10, and 3.54 eV, respectively. The ECBZ-TTZ and DCBZ-TTZ polymers exhibited maximum PL wavelengths of not only 411, 474, and 407 nm in the solution state but also 412 and 476 nm (ECBZ-TTZ) and 371 and 416 nm (DCBZ-TTZ) in the film state. The electrochemical properties of the three materials were tested in the potential range from -0.5 to 1.5 V and all three materials demonstrated stable redox properties. The exponent of the scan rate (i.e., the x-value) for TB-TTZ-DP, ECBZ-TTZ, and DCBZ-TTZ was 0.61, 0.64, and 0.77, respectively. The kinetics of the redox process were controlled by combination of diffusion and electron transfer processes. Among organic lightemitting diodes fabricated using the three materials, the device with DCBZ-TTZ exhibited the best current–voltage characteristics.