512178-32-4Relevant academic research and scientific papers
Tetraphenylethylene-based blue light material containing benzimidazole unit as well as preparation method and application
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Paragraph 0027; 0028; 0029; 0072; 0073; 0074, (2017/10/10)
The invention discloses a tetraphenylethylene-based blue light material containing a benzimidazole unit. The tetraphenylethylene-based blue light material is shown as a structural formula I or II, wherein R1 is H, tert-butyl, n-butyl or hydroxyl, and R2 is alkyl. A 2-nitro-N-tert-butylphenyl amine or 2-nitro-N-n-butylphenyl amine precursor and a 4-formyl tetraphenylethylene precursor is firstly prepared, and then cyclization reaction is carried out to prepare a compound shown as the formula I or II. A preparation method of the compound is easy to operate, the reaction is moderate and the yield is high; the compound has relatively high decomposition temperature and glass-transition temperature, and shows blue fluorescence; the compound has a relatively good single-color property, so that an OLED (Organic Light Emitting Diode) device prepared by taking the compound as a luminescent material emits blue light; the starting voltage is 3.3V and the maximum brightness efficiency is 1.48cd/A. (The formula I and the formula II are shown in the description).
Water-mediated catalyst preactivation: An efficient protocol for C-N cross-coupling reactions
Fors, Brett P.,Krattiger, Philipp,Strieter, Eric,Buchwald, Stephen L.
supporting information; experimental part, p. 3505 - 3508 (2009/05/07)
(Figure Presented) A protocol for forming a highly active Pd(O) catalyst from Pd(OAc)2, water, and biaryldialkylphosphine ligands has been developed. This protocol generates a catalyst system, which exhibits excellent reactivity and efficiency in the coupling of a variety of amides and anilines with aryl chlorides.
A new class of easily activated palladium precatalysts for facile C-N cross-coupling reactions and the low temperature oxidative addition of aryl chlorides
Biscoe, Mark R.,Fors, Brett P.,Buchwald, Stephen L.
, p. 6686 - 6687 (2008/12/22)
A new class of one-component Pd precatalysts bearing biarylphosphine ligands is described. These precatalysts are air- and thermally stable, are easily activated under normal reaction conditions at or below room temperature, and ensure the formation of the highly active monoligated Pd(0) complex necessary for oxidative addition. The use of these precatalysts as a convenient source of LPd(0) in C-N cross-coupling reactions is explored. The reactivity that is demonstrated in this study is unprecedented in palladium chemistry. Copyright
