- SOLVENT-FREE CROSS-COUPLING REACTION, AND PRODUCTION METHOD USING SAID REACTION
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Disclosed is a cross-coupling reaction method which forms a chemical bond selected from C—N, C—B, C—C, C—O and C—S bonds, the method comprising: preparing an aromatic compound (1) having a leaving group;preparing a compound (2) capable of undergoing a cross-coupling reaction selected from an aromatic amino compound (2-1), a diboronic acid ester or the like (2-2), an aromatic boronic acid or the like (2-3), an aromatic compound (2-4) having a hydroxyl group and an aromatic compound (2-5) having a thiol group; andperforming a cross-coupling reaction of the compound (1) with the compound (2) in the presence of a palladium catalyst, a base and a compound (4) having a carbon-carbon double bond or a carbon-carbon triple bond, in the absence of a solvent.
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Paragraph 0311-0314; 0318
(2021/12/30)
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- White light emission in water through admixtures of donor-π-acceptor siblings: Experiment and simulation
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Donor-acceptor π-conjugated molecules with triphenylamine donor and different acceptor (H, cyano, and pyridinium) units with a double bond spacer were synthesized. These compounds exhibit bathochromic shifts in absorption and emission with an increase in the acceptor strength. Solvatochromic measurements in water reveal emitting states characterized by a polar nature with three distinct emission spectral regions from blue to red. Interestingly, binary mixtures of the stilbenes in acetonitrile and water gave white light emission. MD simulations of the admixtures reveal that the emission data directly correlate to the structural arrangements of the molecules driven by intermolecular and solvent interactions with micelle-like structural arrangements for one set and uniform homogenous mixing for the other two sets. Such a tunable emission strategy using simple structural siblings could offer great potential towards designing novel emitting systems.
- Kumari, Beena,Singh, Amit,Jana, Palash,Radhakrishna, Mithun,Kanvah, Sriram
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p. 11701 - 11709
(2019/07/31)
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- Synthesis and characterization of triphenylamine modified azobenzene dyes
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A series of triphenylamine modified azobenzenes were synthesized and studied theoretically and experimentally. D-A-D structures of these dyes were revealed with an intramolecular charge transfer (ICT) from both triphenylamine or indoline units (donor) to
- Zhao, Chuanwu,Wang, Tianyang,Li, Dongmei,Lu, Ting,Liu, Dongzhi,Meng, Qingbo,Zhang, Qianqian,Li, Fengqing,Li, Wei,Hu, Wenping,Wang, Lichang,Zhou, Xueqin
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p. 256 - 264
(2016/11/09)
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- A comprehensive investigation on the cooperative branch effect on the optical properties of novel conjugated compounds
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This paper presents a variety of conjugated derivatives with different number of arms (4-styryltriphenylamine: C1, 4, 4'-di-styryltriphenylamine: C2, 4, 4', 4.-tri-styryltriphenylamine: C3). The linear absorption and fluorescence maxima and the molar extinction coefficients are in the order of C1C2C3 in various solvents. Two-photon absorption (TPA) up-converted emission of the derivatives were determined with Ti: sapphire femtosecond laser. The maximal TPA emission wavelength and the two-photon absorption cross section of the derivatives are also in the order of C1C2C3 in various solvents. The dipole moment changes of the derivatives between the excited state and the ground state were estimated from experiment, and they are in the order of C1C2C3, which is confirmed further by the molecular geometry optimization of the derivatives. The electron density distribution and the energy levels of the frontier orbital of the derivatives were analyzed. The cyclic voltammograms of the derivatives were performed and discussed.
- Yang, Long,Gao, Fang,Liu, Jian,Zhong, Xiaolin,Li, Hongru,Zhang, Shengtao
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p. 545 - 554
(2012/05/05)
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- The synthesis and photophysical properties of novel poly(diarylamino) styrenes
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A series of novel diamines linked by varying conjugated bridges were characterized using FTIR, NMR and UV-visible spectroscopy, mass spectrometry and elemental analysis. The photoluminescence and thermal properties of the compounds were related to structure and quantum chemical calculations were employed to study the optimized ground state geometry of the compounds. The diarylamines exhibited blue to green fluorescence emission and displayed high thermal stability and high glass transition temperature. As such, the compounds might be very useful as hole-transporting materials in organic light-emitting diodes.
- Wang, Hai-Ying,Chen, Gang,Xu, Xiao-Ping,Chen, Hua,Ji, Shun-Jun
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p. 358 - 365
(2011/06/11)
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- O -amino conjugation effect on the photochemistry of trans -aminostilbenes
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The excited-state behavior of a series of trans-2-(N-arylamino)stilbenes (aryl = phenyl (o1H), 4-methylphenyl (o1Me), 4-methoxyphenyl (o1OM), and 4-cyanophenyl (o1CN)) and trans-2-(N,N-diphenylamino)stilbene (o2) in both nonpolar and polar solvents is rep
- Lin, Cheng-Kai,Prabhakar,Yang, Jye-Shane
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scheme or table
p. 3233 - 3242
(2011/06/10)
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- Pure branch effect on the optical properties of novel conjugated derivatives
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Pure cooperative branch effects on one- and two-photon optical properties of conjugated derivatives are presented. AMI calculations demonstrate that the electron density distribution of the frontier orbital and the dipole moment changes of the derivatives are related to the number of branches. The theoretical results show that not only the energy level of the frontier orbital could be mediated by the number of branches, but the HOMOLUMO gap could be regulated.
- Yang, Long,Gao, Fang,Liu, Jian,Zhong, Xiaolin,Li, Hongru,Zhang, Shengtao
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p. 582 - 583
(2010/10/02)
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- One pot sequential reactions and novel products produced thereby
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A method for producing sequenced reaction products comprising performing, in one pot, a first reaction at a lower temperature followed by a second reaction at a higher temperature in the presence of a catalyst system comprising a proazahosphatrane in combination with a palladium compound is provided. In one embodiment, the first reaction is a double amination reaction and the second reaction is an arylation. Use of one pot and a single catalyst system for each set of sequential reactions is efficient and economical. Novel N,N-diarylaminostyrenes and N,N-diarylaminostilbenes are produced according to the methods described herein.
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Page/Page column 9-10
(2010/11/24)
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- One-pot sequential N and C arylations: An efficient methodology for the synthesis of trans 4-N,N-diaryl aminostilbenes
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(Chemical Equation Presented) A double-amination/intermolecular-Heck- reaction sequence is used as a one-pot methodology for sequential C-N and C-C bond formations. 4-Aminostyrene was coupled with aryl bromides and aryl iodides using a [Pd2(dba)3]/proazaphosphatrane catalyst system (dba = dibenzylideneacetone; see scheme) to form irons 4-N,N-diaryl aminostilbene derivatives in high yields, which are comparable to those of previously reported multistep syntheses.
- Nandakumar, Mecheril V.,Verkade, John G.
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p. 3115 - 3118
(2007/10/03)
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- Degenerate nonlinear absorption and optical power limiting properties of asymmetrically substituted stilbenoid chromophores
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Two-photon absorption (2PA) spectra (650-1000 nm) of a series of model chromophores were measured via a newly developed nonlinear absorption spectral technique based on a single and powerful femtosecond white-light continuum beam. The experimental results suggested that when either an electron-donor or an electron-acceptor was attached to a trans-stilbene at a para-position, an enhancement in molecular two-photon absorptivity was observed in both cases, particularly in the 650-800 nm region. However, the push-pull chromophores with both the donor and acceptor groups showed larger overall two-photon absorption cross-sections within the studied spectral region as compared to their mono-substituted analogues. The combined results of the solvent effect and the 1H-NMR studies indicated that stronger acceptors produce a more efficient intramolecular charge transfer character upon excitation, leading to increased molecular two-photon responses in this model-compound set. A fairly good 2PA based optical power limiting behavior from one of the model chromophores is also demonstrated.
- Lin, Tzu-Chau,He, Guang S.,Prasad, Paras N.,Tan, Loon-Seng
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p. 982 - 991
(2007/10/03)
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- Fluorescence enhancement of trans-4-aminostilbene by N-phenyl substitutions: The "amino conjugation effect"
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The synthesis, structure, and photochemical behavior of the trans isomers of 4-(N-phenylamino)-stilbene (1c), 4-(N-methyl-N-phenylamino)stilbene (1d), 4-(N,N-diphenylamino)stilbene (1e), and 4-(N-(2,6-dimethylphenyl)amino)stilbene (1f) are reported and co
- Yang, Jye-Shane,Chiou, Shih-Yi,Liau, Kang-Ling
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p. 2518 - 2527
(2007/10/03)
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- Electrophotographic photoconductor containing stilbene compound
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An electrophotographic photoconductor is disclosed which comprises an electroconductive support material and a photosensitive layer comprising at least one of the stilbene compounds of the formula STR1 wherein R1 represents hydrogen or STR2 Rs
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- Disazo triphenylamine compounds
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A disazo compound, having the general formula, STR1 wherein Y represents a substituted or non-substituted cyclic hydrocarbon or substituted or non-substituted heterocycle; R represents hydrogen, substituted or non-substituted alkyl group, or substituted or non-substituted phenyl group; and Z represents a substituted or non-substituted cyclic hydrocarbon or heterocycle fused with phenyl nucleus.
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