Organic Redox Systems Based on Pyridinium–Carbene Hybrids
作者:Patrick W. Antoni、Tim Bruckhoff、Max M. Hansmann
DOI:10.1021/jacs.9b04249
日期:2019.6.19
Newredoxsystems with three oxidation states are highly sought-after, for example, for redox-flow battery applications, selective reducing agents, or organic electronics. Herein, we describe a straightforward and modular synthesis of a new class of such a three-state redoxsystembased on the intermolecular reaction of a large variety of pyridinium salts with carbenes. These hybrids represent organic
具有三种氧化态的新型氧化还原系统备受追捧,例如用于氧化还原液流电池应用、选择性还原剂或有机电子产品。在此,我们描述了一种基于多种吡啶盐与卡宾的分子间反应的新型三态氧化还原系统的直接和模块化合成。这些杂化物代表具有定制电化学特性的有机(超级)电子供体,并具有三种稳定的氧化态,可以通过 X 射线衍射等对其进行充分表征。我们详细说明了哪些电子因素要么通过一次电子转移促进获得稳定的自由基,要么有利于 2e 过程。事实上,根据X射线数据,验证了潜在的压缩机制,该机制源于第一次氧化事件中的大结构变形。通过几何锁定这种杂交变化,可以实现潜在的扩展。新一类稳定的有机自由基对空气具有高度持久性,甚至中等稳定性。此外,我们证明了我们的模块化合成方法也适用于利用桥接吡啶盐的非常强的多电子 (4e-) 供体。基于新氧化还原系统的稳定性和可逆性,我们可以通过充放电实验证明使用混合分子作为非水氧化还原液流电池的新型阳
Reversal of Tabun Toxicity Enabled by a Triazole‐Annulated Oxime Library—Reactivators of Acetylcholinesterase
作者:Zrinka Kovarik、Jarosław Kalisiak、Nikolina Maček Hrvat、Maja Katalinić、Tamara Zorbaz、Suzana Žunec、Carol Green、Zoran Radić、Valery V. Fokin、K. Barry Sharpless、Palmer Taylor
DOI:10.1002/chem.201805051
日期:2019.3.15
and for post‐exposure treatment is a continued challenge. In this study, we analyzed the reactivation potency of 111 novel nucleophilic oximes mostly synthesized using the CuAAC triazole ligation between alkyne and azide building blocks. We identified several oximes with significantly improved in vitro reactivating potential for tabun‐inhibited human AChE, and in vivo antidotal efficacies in tabun‐exposed
Activation and Facile Dealkylation of Monooxides of 1,8-Bis(alkylthio)naphthalene and 2,2′-Bis(alkylthio)biphenyl with Triflic Anhydride via Dithiadications
Abstract Dithiadications bearing 1,8-bis(alkylthio)naphthalene 2A(a-e) and 2,2′-bis(alkylthio)biphenyl 2B(a-e) structure undergo either the facile deprotonation from the methyl group or dealkylation from the methylene groups by the triflate anion. Dications 2A(a) and 2B(a) having methyl groups were deprotonated readily to afford cyclic sulfonium salts 3A(a) and 3B(a). However, dithiadications 2A(b-e)
Preparation of aliphatic perchlorates and of trifluoromethane sulfonates
申请人:The United States of America as represented by the Secretary of the Navy
公开号:US04165332A1
公开(公告)日:1979-08-21
The formation of predominantly primary aliphatic perchlorates and trifluoethanesulfonates by reacting the corresponding silver salt with primary aliphatic halides in benzene at a temperature from about 5.degree. C. to about 50.degree. C. Primary aliphatic perchlorates and trifluoromethanesulfonates are excellent alkylating agents for amines, alcohols, and nitroalcohols.
A Simple Preparation of Alkyl Trifluoromethanesulfonates (Triflates) from Alkyl Trimethylsilyl Ethers
作者:Corinne Aubert、Jean-Pierre Bégué
DOI:10.1055/s-1985-31336
日期:——
Several alkyl trifluoromethanesulfonates (triflates) 2 are prepared by reacting alkyl trimethylsilyl ethers 1 with trifluoromethanesulfonic anhydride. The triflates 2 can be used for further reactions without isolation, as illustrated in the preparation of the ether 3 and cumene (4).