Practical and Selective sp
<sup>3</sup>
C−H Bond Chlorination via Aminium Radicals
作者:Alastair J. McMillan、Martyna Sieńkowska、Piero Di Lorenzo、Gemma K. Gransbury、Nicholas F. Chilton、Michela Salamone、Alessandro Ruffoni、Massimo Bietti、Daniele Leonori
DOI:10.1002/anie.202100030
日期:2021.3.22
also the fine‐tuning of physicochemical and biological properties of drugs, agrochemicals and polymers. We report here a general and practical photochemical strategy enabling the site‐selective chlorination of sp3 C−H bonds. This process exploits the ability of protonated N‐chloroamines to serve as aminium radical precursors and also radical chlorinatingagents. Upon photochemical initiation, an efficient
Site-Selective Aliphatic C–H Chlorination Using <i>N</i>-Chloroamides Enables a Synthesis of Chlorolissoclimide
作者:Ryan K. Quinn、Zef A. Könst、Sharon E. Michalak、Yvonne Schmidt、Anne R. Szklarski、Alex R. Flores、Sangkil Nam、David A. Horne、Christopher D. Vanderwal、Erik J. Alexanian
DOI:10.1021/jacs.5b12308
日期:2016.1.20
functionalization of aliphatic C-H bonds remain a paramount goal of organic synthesis. Free radical alkane chlorination is an important industrial process for the production of small molecule chloroalkanes from simple hydrocarbons, yet applications to fine chemical synthesis are rare. Herein, we report a site-selective chlorination of aliphatic C-H bonds using readily available N-chloroamides and apply this transformation
13C NMR, 1H NMR and IR spectra of a series of monochloroesters of aliphatic short chain carboxylic acids
作者:Maija T. Pitkänen、Ilpo O.O. Korhonen、Jorma N.J. Korvola
DOI:10.1016/s0040-4020(01)92425-1
日期:1981.1
chemical shifts for 14 isomeric monochloroesters of aliphatic carboxylic acids from propanoic acid to hexanoic acid have been determined. Comparisons are made with the literature values for methyl monochloro-octanoate isomers. Substituent effects for all positions are given. Characteristic IR absorption bands are presented and comparisons are made with regard to the isomeric structure. Connections
已确定脂肪族羧酸的14种异构一氯代酯从丙酸到己酸的13 C化学位移。与单氯辛酸甲酯异构体的文献值进行了比较。给出了所有位置的替代作用。给出了特征性的IR吸收带,并就异构体结构进行了比较。建议在观察到的红外吸收频率趋势与对13 C化学位移的某些“异常”氯取代基效应之间建立联系。考虑了这些化合物的1 H NMR谱。
New free-radical halogenations of alkanes, catalysed by N-hydroxyphthalimide. Polar and enthalpic effects on the chemo- and regioselectivity
Reactions of alkanes with different halogenating systems are compared in order to explore the reactivity of phthalimido-N-oxyl radical in hydrogen abstraction; the importance of polar effects is emphasised.