- Design and synthesis of a new series of tetra(polycyclic aryl)ethenes: Achieving aggregation-induced emission and efficient solid-state photoluminescence
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Abstract Three novel ethene derivatives substituted by four polycyclic aromatic hydrocarbons, tetrakis(4,5,9,10-tetrahydropyren-2-yl)ethene, tetra(fluoren-2-yl)ethene and tetra(biphenyl-4-yl)ethene, were efficiently synthesized and characterized by NMR sp
- Zhang, Zhaoming,Zhao, Yun,Zhang, Ran,Zhang, Lifang,Cheng, Weiqin,Ni, Zhong Hai
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- Palladium/Copper-Catalyzed Oxidative Coupling of Arylboronic Acids with Isocyanides: Selective Routes to Amides and Diaryl Ketones
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An efficient and alternative oxidative cross-coupling strategy starting from arylboronic acids and isocyanides for the selective synthesis of amides and diaryl ketones with palladium/copper catalysis is developed. Various substituted benzamides and benzop
- Lu, Fangling,Chen, Ziyue,Li, Zhen,Wang, Xiaoyan,Peng, Xinyue,Li, Cong,Fang, Lingtong,Liu, Dong,Gao, Meng,Lei, Aiwen
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supporting information
p. 3954 - 3957
(2017/08/14)
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- Synthesis of fluorenone derivatives through Pd-catalyzed dehydrogenative cyclization
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Palladium-catalyzed dual C-H functionalization of benzophenones to form fluorenones by oxidative dehydrogenative cyclization is reported. This method provides a concise and effective route toward the synthesis of fluorenone derivatives, which shows outstanding functional group compatibility.
- Li, Hu,Zhu, Ru-Yi,Shi, Wen-Juan,He, Ke-Han,Shi, Zhang-Jie
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supporting information
p. 4850 - 4853,4
(2012/12/12)
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- Dichloro-bis(aminophosphine) complexes of palladium: Highly convenient, reliable and extremely active suzuki-miyaura catalysts with excellent functional group tolerance
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Dichloro-bis(aminophosphine) complexes are stable depot forms of palladium nanoparticles and have proved to be excellent SuzukiMiyaura catalysts. Simple modifications of the ligand (and/or the addition of water to the reaction mixture) have allowed their formation to be controlled. Dichlorobis[1- (dicyclohexylphosphany1)piperidine]palladium (3), the most active catalyst of the investigated systems, is a highly convenient, reliable, and extremely active Suzuki catalyst with excellent functional group tolerance that enables the quantitative coupling of a wide variety of activated, nonactivated, and deactivated and/or sterically hindered functionalized and heterocyclic aryl and benzyl bromides with only a slight excess (1.1-1.2 equiv) of arylboronic acid at 80°C in the presence of 0.2 mol % of the catalyst in technical grade toluene in flasks open to the air. Conversions of >95% were generally achieved within only a few minutes. The reaction protocol presented herein is universally applicable. Side-products have only rarely been detected. The catalytic activities of the aminophosphine-based systems were found to be dramatically improved compared with their phosphine analogue as a result of significantly faster palladium nanoparticle formation. The decomposition products of the catalysts are dicyclohexylphosphinate, cyclohexylphosphonate, and phosphate, which can easily be separated from the coupling products, a great advantage when compared with non-water-soluble phosphine-based systems.
- Bolliger, Jeanne L.,Frech, Christian M.
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supporting information; experimental part
p. 4075 - 4081
(2010/08/05)
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- Hydroxylation of phenolic compounds
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Phenolic compounds, e.g., phenol, are hydroxylated, preponderantly into the para-isomer, e.g., hydroquinone, by reaction with hydrogen peroxide in the presence of an effective amount of a strong acid and a catalytically effective amount of a keto compound having the formula (II): STR1 in which R1 and R2, which may be identical or different, are each a hydrogen atom or an electron-donating group; n1 and n2, which may be identical or different, are numbers equal to 0, 1, 2 or 3, with the proviso that the two carbon atoms located at the α-position with respect to the two carbon atoms bearing the --CO group may be bonded together via a valence bond or via a --CH2 -- group, thereby forming a keto-containing ring member which may either be saturated or unsaturated.
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