Inverting substitution patterns on amphiphilic cyclodextrins induces unprecedented formation of hexagonal columnar superstructures
作者:Pier-Luc Champagne、David Ester、Michael Zeeman、Carson Zellman、Vance E. Williams、Chang-Chun Ling
DOI:10.1039/c7tc02636f
日期:——
Cyclodextrins (CDs) constitute a unique class of macrocycles that possess a truncated cone-shaped cavity. Chemical modifications with simple hydrophobic groups can generate amphiphilic derivatives capable of self-assembling into thermotropic liquidcrystals. Without the help of introduced mesogenic functionalities, almost all known amphiphilic CDs form smectic mesophases. Here we report that by inverting
Nanoparticle‐supported tris(triazolyl)–CuBr, with a diameter of approximately 25 nm measured by TEM spectroscopy, has been easily prepared, and its catalytic activity was evaluated in the copper‐catalyzed azide–alkyne cycloaddition (CuAAC) reaction. In initial experiments, 0.5 mol % loading successfully promoted the CuAAC reaction between benzyl azide and phenylacetylene, in water at room temperature
FeCl2-Promoted Cleavage of the Unactivated CC Bond of Alkylarenes and Polystyrene: Direct Synthesis of Arylamines
作者:Chong Qin、Tao Shen、Conghui Tang、Ning Jiao
DOI:10.1002/anie.201202464
日期:2012.7.9
efficient and convenient nitrogenation strategy involving CCbondcleavage for the straightforward synthesis of versatile arylamines is presented. Various alkyl azides and alkylarenes, including the common industrial by‐product cumene, react using this protocol. Moreover, this method provides a potential strategy for the degradation of polystyrene.
In contrast to the recent breakthrough in electrochemical C–H aminations, the electrochemicallyoxidative C–N bondformation through a C–C bond cleavage is rarely studied. This work describes an electrochemical C–C amination of alkylarenes for the efficient synthesis of versatile anilines, as well as carbonyl compounds. With the cheap and durable graphite plates as electrodes, and in a simple undivided