Direct C–H Multifluoroarylation of Ethers through Hydrogen Atom Transfer Using Photoredox Catalysis
摘要:
A direct defluorinative multifluoroarylation of unactivated sp(3) C-H bonds through hydrogen atom transfer using photoredox catalysis has been developed. The C(sp(3))-C(sp(2)) couplings between C(sp(2))-F bonds and corresponding C(sp(3))-H bonds adjacent to heteroatoms proceeded smoothly to afford the desired products in moderate to good yields. Preliminary mechanistic investigations on this novel transformation revealed that the C-H cleavage process might be involved in the rate determining step.
Microwave-Assisted Synthesis of Heteroleptic Ir(III)<sup>+</sup> Polypyridyl Complexes
作者:Timothy M. Monos、Alexandra C. Sun、Rory C. McAtee、James J. Devery、Corey R. J. Stephenson
DOI:10.1021/acs.joc.6b00983
日期:2016.8.19
We report a rapid, one-pot, operationally simple, and scalable preparation of valuable cationic heteroleptic iridium(III) polypyridyl photosensitizers. This method takes advantage of two consecutive microwave irradiation steps in the same reactor vial, avoiding the need for additional reaction purifications. A number of known heteroleptic iridium(III) complexes are prepared in up to 96% yield. Notably
Highly Efficient Photocatalytic Water Reduction with Robust Iridium(III) Photosensitizers Containing Arylsilyl Substituents
作者:Dong Ryeol Whang、Ken Sakai、Soo Young Park
DOI:10.1002/anie.201305684
日期:2013.10.25
Waterproof complexes: Cationic IrIII photosensitizers (PSs) with an ancillary 4,4′‐bis(4‐(triphenylsilyl)phenyl)‐2,2′‐bipyridine ligand enabled hydrogen evolution from water with high turnover numbers (TONs; see scheme). The peripheral triphenylsilyl moieties prevent ligand substitution by solvent molecules, such as water, and thus increase the durability of the complexes. SR=sacrificial reducing agent
Two cationic iridium (III) complexes [Ir(dfppy)(tpy)(bpy)](PF6) and [Ir(dfppy)(tpy)(phen)](PF6) bearing threedifferentligands were tested as triplet emitters for Light-Emitting Electrochemical Cells (LECs). These two phosphorescent materials only constitute the third and fourth examples of triple heteroleptic cationic iridiumcomplexes to be tested in electroluminescent devices. LECs fabricated with
Design and photophysical studies of iridium(<scp>iii</scp>)–cobalt(<scp>iii</scp>) dyads and their application for dihydrogen photo-evolution
作者:Cédric Lentz、Olivier Schott、Thomas Auvray、Garry S. Hanan、Benjamin Elias
DOI:10.1039/c9dt01989h
日期:——
several new dyads constituted of cationic iridium(III) photosensitizers and cobalt(III) catalyst connected via free pendant pyridine on the photosensitizers. These dyads were studied by X-ray crystallography, electrochemistry, absorption and emission spectroscopy as well as theoretical calculations and were shown to efficiently produce H2 undervisiblelightirradiation. In every case, the dyad outperformed
我们报告了由阳离子铱(III)光敏剂和钴(III)催化剂通过光敏剂上的游离侧基吡啶连接而成的几种新的二元组。通过X-射线晶体学,电化学,吸收和发射光谱以及理论计算研究了这些二元化合物,并且显示出它们在可见光照射下有效地产生H 2。在每种情况下,二元组都比没有侧基吡啶的同等体系好。还研究了辐照波长与光催化性能之间的相关性,其中H 2的演化数高达295、251、188和78 mol H 2 mol PS -1 分别在蓝色,绿色,黄色和红色的灯光下。