Practical and Selective sp
<sup>3</sup>
C−H Bond Chlorination via Aminium Radicals
作者:Alastair J. McMillan、Martyna Sieńkowska、Piero Di Lorenzo、Gemma K. Gransbury、Nicholas F. Chilton、Michela Salamone、Alessandro Ruffoni、Massimo Bietti、Daniele Leonori
DOI:10.1002/anie.202100030
日期:2021.3.22
also the fine‐tuning of physicochemical and biological properties of drugs, agrochemicals and polymers. We report here a general and practical photochemical strategy enabling the site‐selective chlorination of sp3 C−H bonds. This process exploits the ability of protonated N‐chloroamines to serve as aminium radical precursors and also radical chlorinatingagents. Upon photochemical initiation, an efficient
Platinum Complex Assemblies as Luminescent Probes and Tags for Drugs and Toxins in Water
作者:Stephan Sinn、Frank Biedermann、Luisa De Cola
DOI:10.1002/chem.201605169
日期:2017.2.3
a supramolecular emission‐switch‐on chemosensor in water. Complex formation of the heterocycles with a platinum(II) precursor proceeds readily at ambient conditions, allowing for facile analyte screening. Fifty‐two structurally diverse compounds were tested, out of which 23 pyridines, imidazoles, and triazoles formed strongly emissive complex aggregates. Importantly, they all can be clearly distinguished
开发了一种用于氮杂杂环药物和毒素的反应性磷光探针,可提供水中的超分子发射开关化学传感器。杂环与铂(II)前体的复杂形成在环境条件下容易进行,从而可以轻松进行分析物筛选。测试了52种结构多样的化合物,其中23种吡啶,咪唑和三唑形成了强发射复合物聚集体。重要的是,可以通过主成分分析将它们清晰地区分开,但通常还可以通过简单的目视检查,例如通过它们的发射颜色差异(从蓝色到红色的大变化)。而且,动力学反应曲线和时间分辨的发射特征可以为区分分析物提供有价值的信息。Pt II 由于它们具有良好的光物理特性和在诸如血液等生物介质中的化学稳定性,因此它们可以用作药物和生物分子的发射标记。
A Convenient Method for the Regioselective Synthesis of 4-Alkyl(aryl)pyridines Using Pyridinium Salts
作者:Kin-ya Akiba、Y\={u}ji Iseki、Makoto Wada
DOI:10.1246/bcsj.57.1994
日期:1984.7
(81–94%). The dihydropyridines were oxidized by oxygen to give 4-alkyl(aryl)pyridines (38–68%). Grignardreagents also reacted with 1-t-butyldimethylsilylpyridinium triflate with almost complete regioselectivity (>99%) to afford the corresponding 1,4-dihydropyridines, which were easily oxidized by oxygen to give 4-substituted pyridines in higher yields than above (58–70%).
Scanning-Tunneling-Spectroscopy-Directed Design of Tailored Deep-Blue Emitters
作者:Jan Sanning、Pascal R. Ewen、Linda Stegemann、Judith Schmidt、Constantin G. Daniliuc、Tobias Koch、Nikos L. Doltsinis、Daniel Wegner、Cristian A. Strassert
DOI:10.1002/anie.201407439
日期:2015.1.12
moieties enables independent tuning of the frontier orbital energies, and the measured HOMO–LUMO gaps are reproduced by DFT calculations. The energy gaps correlate with the measured and the calculated energies of the emissive triplet states and the experimental luminescence wavelengths. This synergetic interplay between synthesis, microscopy, and spectroscopy enabled the design and realization of a deep‐blue