- α-Cyanostilbene and fluorene based bolaamphiphiles: Synthesis, self-assembly, and AIEE properties with potential as white-light emissive materials and light-emitting liquid crystal displays
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Novel bolaamphiphiles containing two α-cyanostilbene units interconnected with 2,7-substituted-9,9-dialkylated fluorene as the central core and a diol unit at each terminal have been synthesized efficiently by a palladium catalyzed Suzuki coupling reaction and the Knoevenagel condensation reaction as key steps. POM, DSC and XRD investigation reveals that these compounds can organize into single wall triangular honeycomb columnar phases. A unique packing model was established in which the twisted π-conjugated backbones stacked alternatively into the walls and were connected through the end diol groups to form a triangular honeycomb, and the almost perpendicularly distributed alkyl side chains filled the cells. Such packing was additionally stabilized by the local anti-parallel dipole interactions of α-cyanostilbene and the H-bonding between CN?H. These compounds showed the AIEE effect and emitted yellow luminescence which could be further utilized to generate white light emission by coating on a commercially available blue LED lamp. Additionally, light-emitting liquid crystal display (LE-LCD) device could be obtained by dissolution of such AIE active distinctive luminogens in commercially available nematic LCs.
- Zhang, Deling,Liu, Yuantao,Gao, Hongfei,Chang, Qing,Cheng, Xiaohong
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supporting information
p. 17474 - 17481
(2021/01/05)
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- One-Pot Preparation of C1-Homologated Aliphatic Nitriles from Aldehydes through a Wittig Reaction under Metal-Cyanide-Free Conditions
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A one-pot protocol to obtain C1-homologated aliphatic nitriles was achieved by treating aromatic and aliphatic aldehydes with the (methoxymethyl)triphenylphosphonium ylide followed by hydrolysis of the resulting methyl vinyl ethers with pTsOH (Ts = para-toluenesulfonyl) and treatment with molecular iodine and aqueous ammonia under metal cyanide free conditions. Neopentyl-type nitriles, which could not be obtained by conventional methods that involved conversion of the neopentyl alcohol into a tosylate and treatment with metal cyanide, were successfully obtained by using the present method.
- Ezawa, Masatoshi,Togo, Hideo
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p. 2379 - 2384
(2017/05/01)
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- Visible-light-induced thiotrifluoromethylation of terminal alkenes with sodium triflinate and benzenesulfonothioates
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An unconventional reductive quenching cycle was developed to realize the visible-light-induced thiotrifluoromethylation of terminal alkenes. CF3SO2Na was used as an easy to handle CF3 radical source to afford the desired products in moderate to good yields. Mild reaction conditions and a broad substrate scope feature in this transformation.
- Kong, Weiguang,An, Hejun,Song, Qiuling
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supporting information
p. 8968 - 8971
(2017/08/15)
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- A facile synthesis of benzofuran derivatives: A useful synthon for preparation of trypsin inhibitor
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Mono-substituted 2-methylbenzo[b]furans were prepared by Claisen rearrangement of corresponding allyl phenyl ethers and subsequent bis(benzonitrile)palladium(II) chloride-mediated cyclization of o-allylphenols.
- Sekizaki, Haruo,Itoh, Kunihiko,Toyota, Eiko,Tanizawa, Kazutaka
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p. 237 - 243
(2007/10/03)
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