A highly chemoselective perfluoroalkylation reaction of aromatic halides is reported. Thermally stable perfluoroalkylzinc reagents, generated by a rapid halogen–zinc exchange reaction between diorganozinc and perfluoroalkyl halide species, couple with a wide range of aryl halides in the presence of a copper catalyst, in moderate to high yields. Good stability of the perfluoroalkylzinc species was indicated
Remote functionalization reactions as conformational probes for flexible alkyl chains
作者:Ronald Breslow、Jonathan Rothbard、Frederick Herman、Matias L. Rodriguez
DOI:10.1021/ja00472a030
日期:1978.2
Syntheses and Properties of Graphyne Fragments: Trigonally Expanded Dehydrobenzo[12]annulenes
作者:Kazukuni Tahara、Yuki Yamamoto、Dustin E. Gross、Hiroyoshi Kozuma、Yoko Arikuma、Koji Ohta、Yoshiko Koizumi、Yuan Gao、Yo Shimizu、Shu Seki、Kenji Kamada、Jeffrey S. Moore、Yoshito Tobe
DOI:10.1002/chem.201300838
日期:2013.8.19
We present herein the synthesis and properties of the largest hitherto unknown graphynefragment, namely trigonallyexpanded tetrakis(dehydrobenzo[12]annulene)s (tetrakis‐DBAs). Intramolecular three‐fold alkyne metathesis reactions of hexakis(arylethynyl)DBAs 9 a and 9 b using Fürstner’s Mo catalyst furnished tetrakis‐DBAs 8 a and 8 b substituted with tert‐butyl or branched alkyl ester groups in moderate
我们在这里介绍了迄今最大的未知石墨烯片段,即三角扩展的四(脱氢苯并[12]环戊烯)s(四-DBA)的合成和性质。分子内三倍六(芳基乙炔)的DBA的炔烃复分解反应9和9b中使用Fürstner的钼催化剂配四-的DBA 8和图8b取代有叔丁基或在中度和公平收益支链烷基酯基团,分别为示范该协议的复分解反应是构建石墨烯片段骨架的有力工具。为了进行比较,六(芳基乙炔基)DBA 9 c – g也已经准备好了。四- DBA的单光子吸收光谱8一个轴承叔丁基团揭示的吸收截止(的一个显着的红移λ截止与先前报道graphyne片段由于扩展的π共轭的相比较)。此外,在双光子吸收光谱中,由于平面对-亚苯基-亚乙炔基的共轭途径,8a显示了纯烃的较大横截面。六(芳基乙炔基)-DBA 9 c - e和9 g以及四-DBA 8 b在氯仿溶液中聚集的带有吸电子基团。带有相同取代基的9 e和8 b的自由能之间的比较显示,由于扩