Inexpensive Radical Methylation and Related Alkylations of Heteroarenes
作者:Qi Huang、Samir Z. Zard
DOI:10.1021/acs.orglett.8b00190
日期:2018.3.2
A simple method for the introduction of a methyl and higher aliphatic group to various heteroarenes using very inexpensive reagents is described. It is based on the radical addition of a carboxylic xanthate followed by decarboxylation. Depending on the heteroarene structure, the decarboxylation can be spontaneous or induced by heating in N,N-dimethylacetamide or N-methyl pyrrolidone in a microwave
Ubiquitous Nature of Rate Retardation in Reversible Addition–Fragmentation Chain Transfer Polymerization
作者:Kate G. E. Bradford、Leilah M. Petit、Richard Whitfield、Athina Anastasaki、Christopher Barner-Kowollik、Dominik Konkolewicz
DOI:10.1021/jacs.1c08654
日期:2021.10.27
Reversibleaddition–fragmentationchaintransfer (RAFT) polymerization is one of the most powerful reversible deactivation radical polymerization (RDRP) processes. Rate retardation is prevalent in RAFT and occurs when polymerization rates deviate from ideal conventional radical polymerization kinetics. Herein, we explore beyond what was initially thought to be the culprit of rate retardation: dithiobenzoate
Visible‐Light‐Driven MADIX Polymerisation via a Reusable, Low‐Cost, and Non‐Toxic Bismuth Oxide Photocatalyst
作者:Karen Hakobyan、Thomas Gegenhuber、Christopher S. P. McErlean、Markus Müllner
DOI:10.1002/anie.201811721
日期:2019.2.4
amalgamation of photocatalysis into existing reversibledeactivationradical polymerisation (RDRP) processes has initiated a rapidly propagating area of polymer research in recent years. We introduce bismuth oxide (Bi2O3) as a heterogeneous photocatalyst for polymerisations, operating at room temperature with visible light. We demonstrate formidable control over degenerative chain‐transfer polymerisations
近年来,将光催化作用不断合并成现有的可逆失活自由基聚合(RDRP)工艺,已开始迅速推动聚合物研究领域的发展。我们介绍氧化铋(Bi 2 O 3)作为聚合反应的非均相光催化剂,可在室温和可见光下操作。我们展示了对退化链转移聚合的强大控制,例如通过黄药酸酯(MADIX)和可逆加成-断裂链转移(RAFT)聚合的大分子设计。我们实现了窄的分子量分布,并归因于光诱导电子转移(PET)过程的出色的时间控制。该方法用于合成结合了不同活化单体的二嵌段共聚物。Bi 2 O 3催化剂体系的其他优点是毒性低,可重复使用,成本低以及易于从反应混合物中除去。
<i>N</i>,<i>N</i>-Ru(<scp>ii</scp>)-<i>p</i>-cymene-poly(<i>N</i>-vinylpyrrolidone) surface functionalized gold nanoparticles: from organoruthenium complex to nanomaterial for antiproliferative activity
end-functionalized poly(N-vinylpyrrolidone). It is demonstrated that these particles exhibit higher anti-proliferative activity than the individual organometallic ruthenium(II) complex of the type [Ru(η6-p-cymene)(NN)Cl]PF6, where NN is bis(4-methoxyphenylimino)acenaphthene, against colorectal adenocarcinoma celllines. More specifically, a RuII(η6-p-cymene) complex containing a NN bidentate ligand has
有机金属 Ru-芳烃配合物作为抗癌剂很有前景,但缺乏肿瘤吸收和在生理介质中的溶解度差阻碍了它们的发展。为了应对这些挑战,我们开发了涂有 Ru(芳烃)功能化 PNVP-Py 的金纳米粒子,其中 PNVP-Py 是吡啶末端功能化的聚(N-乙烯基吡咯烷酮)。结果表明,这些颗粒显示出比[Ru(η 6 - p -cymene)(NN)Cl]PF 6类型的单个有机金属钌 ( II ) 配合物更高的抗增殖活性,其中 NN 是双(4-甲氧基苯基亚氨基) ) 苊,对抗结直肠腺癌细胞系。更具体地说,Ru II (η 6- p -cymene) 复合物含有 NN 双齿配体,并通过光谱研究和 X 射线晶体学表征。为了将分离的复合物束缚在 AuNPs 的表面上,PNVP-Py 的一端含有一个吡啶基团以与 Ru-复合物配位,另一端含有一个合适的官能团以结合在 AuNPs 的表面上,具有制备并用于获得大分子复合物[Ru(η
Synthesis of functionalized poly(vinyl acetate) mediated by alkyne-terminated RAFT agents
作者:Joana. R. Góis、Anatoliy V. Popov、Tamaz Guliashvili、Arménio C. Serra、Jorge F. J. Coelho
DOI:10.1039/c5ra15580k
日期:——
Two new xanthates with alkyne functionalities were synthesized for the reversible addition fragmentation chain transfer (RAFT) polymerization of vinyl acetate (VAc).