Synthesis and spectroscopic properties of 1,3,5-tris(arylalkynyl)-2,4,6-trimethoxybenzenes
摘要:
A number of C-3-symetric 1,3,5-tris(arylalkynyl)-2,4,6-trimethoxybenzenes which carry electron withdrawing aryl substituents at the acetylenic periphery and donating methoxy groups on the central benzene ring are prepared via Sonogashira coupling. The utility of two different synthetic routes is evaluated as well as the effect of the nature of the aryl and ethynyl starting compounds in the coupling reaction. Finally, a correlation between the substitution pattern of the alkynyl compounds and their UV-vis and fluorescence spectroscopic properties is established. (C) 2004 Elsevier Ltd. All rights reserved.
The synthesis of a series of octopolar 1,3,5-tris(ethynylphenyl)benzenes via Sonogashira coupling is described, varying the substituents on both the central benzene core as well as the acetylenic periphery. In particular, systems bearing an electron-rich core and an electron-poor periphery are obtained that display advanced optical properties. The linear (by UV−vis and fluorescence spectroscopy) and
Synthetic Use of 1-(<i>p</i>-Toluenesulfonyloxy)-1,2-benziodoxol-3(1<i>H</i>)-one: Iodination of Aromatic Rings
作者:Takahito Muraki、Hideo Togo、Masataka Yokoyama
DOI:10.1055/s-1998-1639
日期:1998.3
Treatment of various aromatic compounds with 1-(p-toluenesulfonyloxy)-1,2-benziodoxol-3(1H)-one 1A and iodine gave the corresponding iodinated compounds in good yields. Similarly, chlorination and bromination proceeded effectively. As compared with other trivalent iodine compounds, the iodinane 1A showed the best reactivity as a halogenation reagent.
DOSY NMR, X-ray Structural and Ion-Mobility Mass Spectrometric Studies on Electron-Deficient and Electron-Rich M<sub>6</sub>L<sub>4</sub> Coordination Cages
6-tri(4-pyridyl)-1,3,5-triazine, while the trimethoxy-triethynylbenzene-based ligand L2 is more electron-rich than the corresponding benzene analogue. Complexation of the ligands with cis-protected square-planar [(dppp)Pt(OTf)2] or [(dppp)Pd(OTf)2] corner-complexes yields two electron-deficient (1a and 1b) and two electron-rich (2a and 2b) M6L4 cages. The single crystal X-ray diffraction study of 1a
提出了一种新颖的模块化方法,以解决缺电子和富电子的M 6 L 4笼子的问题。从相同的起始化合物,通过对合成路线的少量调节,以良好的产率获得了具有不同电子性质的两个C 3对称配体L1和L2。基于三氟-三乙炔基苯的配体L1比众所周知的2,4,6-三(4-吡啶基)-1,3,5-三嗪更缺乏电子,而基于三甲氧基-三乙炔基苯的配体L2更缺乏电子。富电子的比相应的苯类似物。配体与顺式保护的方形[[dppp)Pt(OTf)2 ]或[(dppp)Pd(OTf)的络合2 ]角复合物产生两个缺电子的(1a和1b)和两个富含电子的(2a和2b)M 6 L 4笼。对1a和2a的单晶X射线衍射研究证实了预期的八面体形状约为ca。2000埃3腔与约 11Å宽孔。晶体学确定的直径1a和2a分别为3.7 nm和3.6 nm。由DOSY NMR在CDCl 3:CD 3中获得的流体力学直径OD(4:1)和通过离子迁移质谱(IM
Single-Crystal-to-Single-Crystal (SCSC) Linear Polymerization of a Desymmetrized Anthraphane
作者:Marco Servalli、Nils Trapp、A. Dieter Schlüter
DOI:10.1002/chem.201802513
日期:2018.10.9
one of the rare cases of single‐crystal‐to‐single‐crystal (SCSC) linear polymerizations, resulting in a novel ladder‐type polymer. The polymerization is based on the photoinduced [4+4]‐cycloaddition reactions between trifunctional anthracene‐based monomers. The careful design of the monomer anthraphane‐tri(OMe), results in perfectly stacked anthracene pairs in the crystal structure, with Schmidt's
Controlling the Macroscopic Chirality of Organic Materials Based on 1,3,5-Trialkynylbenzenes
作者:Gunther Hennrich、Belén Nieto-Ortega、Berta Gómez-Lor、Entique Gutierrez、Laura de Vega、Emma Cavero、Francisco J. Ramírez、Juan T. López Navarrete、Juan Casado
DOI:10.1002/ejoc.201101636
日期:2012.3
By changing the position of the homochiral alkoxy substituents of C3-symmetric 1,3,5-trialkynylbenzenes from the center to the periphery, the macroscopicchirality of the resulting aggregates (crystals or fibers), studied by various spectroscopic and microscopic techniques, was inverted, as confirmed by single-crystal X-ray diffraction analysis.
通过将 C3 对称 1,3,5-三炔基苯的同手性烷氧基取代基的位置从中心改变到外围,通过各种光谱和显微镜技术研究的所得聚集体(晶体或纤维)的宏观手性被反转,通过单晶 X 射线衍射分析证实。