Zinc Powder Catalysed Formylation and Urealation of Amines Using
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作者:Chongyang Du、Yaofeng Chen
DOI:10.1002/cjoc.202000072
日期:2020.10
valuable organiccompounds catalysed by cheap and biocompatible metal catalysts is one of important topics of current organic synthesis and catalysis. Herein, we report the zinc powder catalysed formylation and urealation of amines with CO2 and (EtO)3SiH under solvent free condition. Using 2 mol% zinc powder as the catalyst, a series of secondary amines, both the aromatic ones and the aliphatic ones,
作者:Halleh B. Balch、Austin M. Evans、Raghunath R. Dasari、Hong Li、Ruofan Li、Simil Thomas、Danqing Wang、Ryan P. Bisbey、Kaitlin Slicker、Ioannina Castano、Sangni Xun、Lili Jiang、Chenhui Zhu、Nathan Gianneschi、Daniel C. Ralph、Jean-Luc Brédas、Seth R. Marder、William R. Dichtel、Feng Wang
DOI:10.1021/jacs.0c10151
日期:2020.12.16
2DP layers reveals enhancement of the 2DP photoluminescence by two orders of magnitude in ultrathin sheets and an unexpected thickness-dependent modulation of the ultrafast excited state dynamics in the 2DP/MoS2 heterostructure. These results provide fundamental insight into the electronic structure of 2DPs and present a route to tune emergent quantum phenomena in 2DP hybrid vanderWaals heterostructures
the coupling of electron-rich and electron-poor aryl halides with both primary and secondary alkyl amines. In this study, it is reported that a Ni(II)-bipyridine complex catalyzes efficient C–N coupling of aryl chlorides and bromides with various primary and secondary alkyl amines under direct excitation with light. Intramolecular C–N coupling is also demonstrated. The feasibility and applicability of
A mild and practical copper catalyzed amination of halothiophenes
作者:Zhikuan Lu、Robert J. Twieg
DOI:10.1016/j.tet.2004.11.017
日期:2005.1
We have found that N,N-dimethylethanolamine (deanol) is a useful solvent and ligand for copper catalyzed amination of a variety of unactivated and activated 2- or 3-halothiophenes. Primary amines, acyclic secondary amines, cyclic secondary amines and acyclic secondary amines with 2-hydroxyethyl functionality react with halothiophenes in moderate to excellent yields. The mildly basic conditions utilized are compatible with many functional groups. The animation of halobithiophenes has also been examined. The aminothiophenes produced by this method are important intermediates in a variety of electronic and optoelectronic materials. (C) 2004 Elsevier Ltd. All rights reserved.
Spectrally Switchable Photodetection with Near-Infrared-Absorbing Covalent Organic Frameworks
Most covalent organic frameworks (COFs) to date are made from relatively small aromatic subunits, which can only absorb the high-energy part of the visible spectrum. We have developed near-infrared-absorbing low bandgap COFs by incorporating donor acceptor-type isoindigo- and thienoisoindigo-based building blocks. The new materials are intensely colored solids with a high degree of long-range order and a pseudo-quadratic pore geometry. Growing the COF as a vertically oriented thin film allows for the construction of an ordered interdigitated heterojunction through infiltration with a complementary semiconductor. Applying a thienoisoindigo-COF:fullerene heterojunction as the photoactive component, we realized the first COF-based UV- to NIR-responsive photodetector. We found that the spectral response of the device is reversibly switchable between blue- and red-sensitive, and green- and NIR-responsive. To the best of our knowledge, this is the first time that such nearly complete inversion of spectral sensitivity of a photodetector has been achieved. This effect could lead to potential applications in information technology or spectral imaging.