An efficient nickel-catalyzed acceptorless dehydrogenative coupling of methyl-substituted heteroarenes with primary alcohols is achieved using an in situ generated complex of inexpensive NiBr2 and readilyavailable 8-aminoquinoline picolinic amide ligand. The protocol is operationally simple and scalable and furnishes a series of high-value 2-alkenylheteroarenes in good yields (up to 88%) with exclusive
Synthesis and Photophysical Properties of Conjugated Quinolines
作者:Youfeng Yue、Mingxin Yu、Longguan Zhu
DOI:10.3184/030823409x465286
日期:2009.7
Aryl halides were prepared by condensation of 2-methylquinoline and bromo- or chloro-arylaldehydes in aceticanhydride. Diarylamines reacted with the aryl halides to afford novel triarylamine derivatives using Pd(OAc)2/P (o-tolyl)3 as catalyst. These compounds have potential as organic light-emitting device materials and were characterised by FT-IR, 1H NMR and elemental analyses. The UV-vis absorption
aldehydes has been achieved through a novel synergistic organocatalysis. The HOAc‐ activated 2‐methylquiolines undergo a Michael addition to 1,3‐dimethylbarbituricacid‐activated aldehydes, followed by a retro‐Michael addition to release 1,3‐dimethylbarbituricacid and the target products. The transformation produced various 2‐alkenylquinolines with good to excellent yields and featured mild reaction conditions
High-contrast mechanofluorochromism and acidochromism of D-π-A type quinoline derivatives
作者:Yanbing Shen、Pengchong Xue、Jiaxi Liu、Jipeng Ding、Jingbo Sun、Ran Lu
DOI:10.1016/j.dyepig.2018.11.044
日期:2019.4
New D-π-Atype quinoline derivatives (CbzVQ and TPAVQ) were synthesized via Knoevenagel condensation reactions. They exhibited reversible high-contrast mechanofluorochromic (MFC) behavior under grinding/fuming treatment. Taking CbzVQ as an example, its fluorescence could be switched from blue to greyish green by grinding the as-synthesized sample into ground powders, and the fluorescence emission was
A photosensitive element for electrophotography has an electrically conductive substrate (1) and a layer structure (2,3) thereon comprising a charge generating substance and a charge transport substance. An improved charge transport substance is a derivative of triphenylamine in which at least 80% of the electrons in the highest occupied molecular orbital are located on the triphenylamine skeleton. Examples of such compounds have the following formula:
wherein X is a an optionally substituted heterocyclic radical containing at least one ring nitrogen, Q is a single bond or ―C=C―, and Z₁, Z₂ and Z₃ are H, lower alkyl or alkoxy, aryl, NO₂, CF₃, ―N(R′)₂, ―S-C₆H₅ or ―S(R′)₂.