- Simple Modifications for the Facile Preparation of 1,1,2,3,4,4-Hexaaryl-1,3-butadienes
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A facile preparation of 1,1,2,3,4,4-hexaaryl-1,3-butadienes which are important molecules due to their aggregation-induced emission (AIE) activity was achieved by simple modifications of the reaction conditions reported in the previous work. In this react
- Sakaguchi, Tomoya,Kusumoto, Naoki,Shimomura, Osamu,Ohtaka, Atsushi
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- Divergent and Stereoselective Synthesis of Tetraarylethylenes from Vinylboronates
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The synthesis of a new tetraborylethylene (TBE) is reported, and its application in the preparation of [4+0]-tetraarylethenes (TAEs) is elucidated. TAEs have widespread applications in material science and supramolecular chemistry due to their aggregation-induced emission (AIE) properties. The divergent and stereoselective synthesis of [3+1]-, [2+2]-, and [2+1+1]-TAEs via multiple couplings of vinylboronates with aryl bromides is demonstrated. These couplings feature a broad substrate scope and excellent functional group compatibility due to mild reaction conditions. Facile access to various tetraarylethenes is provided. This strategy represents an important complement to the conventional methods employed for the synthesis of TAEs, and would be a valuable tool for synthesizing TAE-based molecules useful in functional materials, biological imaging and chemical sensing.
- Stang, Peter J.,Yao, Yisen,Zhang, Minghao,Zhao, Wanxiang
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supporting information
p. 20090 - 20098
(2020/09/02)
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- 1, 1, 2, 2 - Tetraborate ethylene, and preparation method and application thereof (by machine translation)
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The invention discloses 1, 1, 2, 2 - tetraborate ethylene and a preparation method and application, 1, 1, 2, 2 - tetraborate ethylene, and the structural formula thereof is: Where. 1, 1, 2, 2 - Tetraborate ethylene and halogenated aromatic hydrocarbon are
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Paragraph 0052-0056
(2019/10/01)
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- Composition and synthesis of aggregation-induced emission materials
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The present subject matter relates to compositions containing and synthesis of fluorescent materials e made from tetraphenylethylene (TPE) derivative compounds exhibiting aggregation induced emission (AIE) properties. Further contemplated herein are applications for TPE derivative compounds such as electroluminescent devices since they have a high efficiency, low turn on voltage, and excellent brightness. Additionally, application of TPE derivatives exhibiting AIE properties in various fields such as OLEDs, fingerprinting and forensic technology, and various other biological and industrial sectors are discussed.
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Page/Page column 34; 35-36
(2018/04/20)
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- Tetraarylethylenes from Diarylmethanones and Hexachlorodisilane: The “Sila-McMurry” Reaction
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Hexachlorodisilane reacts with diarylmethanones (aryl=C6H5, 4-MeC6H4, 4-tBuC6H4, 4-ClC6H4, 4-BrC6H4) to furnish the corresponding tetraarylethylenes in good yields. The reductive conversion requires temperatures of about 160 °C and reaction times of 60–72 h. In the initial step, the Lewis-basic carbonyl groups likely generate low-valent [SiCl2] as an analogue of [TiCl2] in the classical McMurry reaction. The coupling sequence further proceeds via benzopinacolones, which have been isolated as key intermediates.
- Moxter, Maximilian,Tillmann, Jan,Füser, Matthias,Bolte, Michael,Lerner, Hans-Wolfram,Wagner, Matthias
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supporting information
p. 16028 - 16031
(2016/10/26)
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- Insights into the general and efficient cross McMurry reactions between ketones
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The selective cross McMurry couplings of diaryl or aryl ketones with various substituted ketones were achieved in 53-94% isolated yields. It is believed that the strong affinity of the substituents to the low-valent titanium surface plays an important role in regards to moderating selectivity. Through the introduction of such substituents followed by their removal post McMurry coupling, structurally similar ketones can be effectively cross-coupled.
- Duan, Xin-Fang,Zeng, Jing,Lue, Jia-Wei,Zhang, Zhan-Bin
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p. 9873 - 9876
(2007/10/03)
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- Selenobenzophenones and diazoalkanes: Isolation of tetraarylethylenes by the reaction of benzophenone hydrazones with diselenium dibromide
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The reaction of selenobenzophenones with diazomethane afforded the corresponding diarylethylenes and symmetrical olefins. The reaction with diaryldiazomethanes gave three different types of tetraarylethylenes. This reaction proceeded through 1,3,4-selenadiazoline intermediates, and retrocyclization was observed. The formation of 1,3,4-selendiazolines was independently confirmed by the reaction of benzophenone hydrazones with diselenium dibromide, which afforded tetraarylethylenes in good yields. This method is applicable to the two-step synthesis of tetraarylethylenes from benzophenones. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.
- Okuma, Kentaro,Kojima, Kazuki,Oyama, Kosuke,Kubo, Kento,Shioji, Kosei
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p. 820 - 825
(2007/10/03)
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- Disproportionation and structural changes of tetraarylethylene donors upon successive oxidation to cation radicals and to dications
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The stepwise (one-electron) chemical oxidation of the tetraphenylethylene donor and its substituted analogues (D) can be carded out by electron exchange with aromatic cations or antimony(V) oxidants to selectively afford the cation radical (D+.
- Rathore,Lindeman,Kumar,Kochi
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p. 6931 - 6939
(2007/10/03)
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- Novel reaction of selenobenzophenones with alkyllithiums leading to symmetrical olefins
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The reaction of selenobenzophenones with alkyllithiums or Grignard Reagents exclusively affords symmetrical tetraarylethylenes as selenophilic products. The reaction might proceed through episelenide (selenirane) intermediates.
- Okuma, Kentaro,Koda, Gen,Okumura, Seiji,Ohno, Atsuyoshi
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p. 609 - 610
(2007/10/03)
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- Ytterbium Metal Mediated Desulfurization and Coupling Reaction of Diaryl Thioketones
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Diaryl thioketones are selectively reduced with ytterbium metal to diarylmethanethiols, diarylmethanes or tetraarylethylenes, via thiometallacycle intermediates which undergo electrophilic coupling at thiocarbonyl carbon and sulfur.
- Makioka, Yoshikazu,Uebori, Shin-ya,Tsuno, Masumi,Taniguchi, Yuki,Takaki, Ken,Fujiwara, Yuzo
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p. 611 - 614
(2007/10/02)
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- SELENOBENZOPHENONES AND DIAZOALKANES: REACTION AND MECHANISTIC ELUCIDATION
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The reaction of selenobenzophenones with diazomethane, afforded the corresponding diarylethylenes and symmetrical olefins.The reaction with other diazoalkanes gave three different types of olefins.This reaction proceeded through selenadiazoline intermediates and retrocyclization was observed.Keywords: Selenobenzophenone; diazoalkane; selenadiazoline; episelenide; olefin.
- Okuma, Kentaro,Kojima, Kazuki,Ohta, Hiroshi
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p. 259 - 262
(2007/10/02)
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- Reactions of selenobenzophenones with dimethyl acetylenedicarboxylate or norbornadiene
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Reactions of selenobenzophenones with dimethyl acetylenedicarboxylate or norbornadiene gave benzoselenapyranes or seven-membered cyclic selenides; these reactions might proceed through unusual type of cycloaddition reaction.
- Okuma,Kojima,Kaneko,Ohta
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p. 1333 - 1336
(2007/10/02)
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- Novel reductive couplinog-rearrangement of carbonyl compounds with metal/Lewis acid under irradiation of ultrasonic wave
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Novel reductive coupling-rearrangement of carbonyl compounds such as benzophenones with Al or Zn/ AlCl3 in CH3CN under irradiation of ultrasonic wave gave benzopinacolones via epoxides in good yields.
- Sato, Ryu,Nagaoka, Takeshi,Saito, Minoru
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p. 4165 - 4168
(2007/10/02)
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