1,3-Difunctionalization of β-Alkyl Nitroalkenes via Combination of Lewis Base Catalysis and Radical Oxidation
作者:Ye Wang、Lei Zheng、Xiaodong Shi、Yunfeng Chen
DOI:10.1021/acs.orglett.0c04106
日期:2021.2.5
catalyst, β-alkyl-substituted nitroalkenes could be readily converted into allylicnitrocompounds. Examples of either C-1 or C-3 functionalization methods have been reported through nitro-elimination, giving alkene products. In this work, successful 1,3-difunctionalization was achieved through a synergetic Lewis base catalysis and TBHP radical oxidation, giving vinylic alkoxyamines in good to excellent
Iron Chloride/4-Acetamido-TEMPO/Sodium Nitrite-Catalyzed Aerobic Oxidation of Primary Alcohols to the Aldehydes
作者:Weili Yin、Changhu Chu、Qiongqiong Lu、Jianwei Tao、Xinmiao Liang、Renhua Liu
DOI:10.1002/adsc.200900662
日期:2010.1.4
l‐1‐oxy (TEMPO) derivatives has been screened for their ability in the oxidation of primaryalcohols to the aldehydes with dioxygen under mild conditions. An evaluation of the efficiency of these 4‐substituted TEMPO derivatives in the alcoholoxidation may allow an insight into the effect of the structural variations of TEMPO on the oxidation of alcohols, which should facilitate catalyst design and
Intramolecular Radical Carboaminoxylation of Aryl Amines
作者:Armido Studer、Marcel Hartmann、Carolin Gerleve
DOI:10.1055/s-0035-1560770
日期:——
Cyclizingradicalcarboaminoxylation of various arylamines is presented. The aryl diazonium salts in situ generated from the corresponding arylamines are reduced by tetra-n-butylammonium iodide (TBAI) to give the corresponding arylradicals. These arylradicals undergo 5-exo and 6-exo cyclization. Subsequent trapping with TEMPO or various other nitroxides provides the corresponding cyclized carboaminoxylated
介绍了各种芳胺的环化自由基羧基氧基化。由相应的芳胺原位生成的芳基重氮盐被四正丁基碘化铵 (TBAI) 还原,得到相应的芳基。这些芳基经历 5-exo 和 6-exo 环化。随后用 TEMPO 或各种其他氮氧化物捕集以中等至非常好的产率提供相应的环化羧基氨基氧化产物。
A versatile approach for the preparation of end‐functional polymers and block copolymers by stable radical exchange reactions
作者:Yonca Alkan Goksu、Gorkem Yilmaz、Yusuf Yagci
DOI:10.1002/pola.29400
日期:2019.12.15
TEMPO derivatives bearing hydroxyl, azide and carboxylic acid functionalities, and polymers such as poly(ethylene glycol) (TEMPO‐PEG) and poly(ε‐caprolactone) (TEMPO‐PCL). Due to the simultaneous radical generation and reversible termination of the polymer radical, TEMPO moiety on polystyrene is replaced to form the corresponding end‐functional polymers and block copolymers. The intermediates and final
Revisiting the Electrochemistry of TEMPOH Analogues in Acetonitrile
作者:Xiao Zhao、Jin-Dong Yang、Jin-Pei Cheng
DOI:10.1021/acs.joc.2c02537
日期:2023.1.6
experimentally observed facile oxidation of TEMPOH. Herein, the electrochemistry of TEMPOH derivatives in acetonitrile was revisited, featuring much smaller oxidation potentials (about 0 V) than literature ones. Acid/base effects and kinetic studies lent credibility to these new values. Such a 0.7 V energy discrepancy impelled us to review the thermodynamic properties and oxidation mechanisms of TEMPOH deduced
以 1-羟基-2,2,6,6-四甲基哌啶 (TEMPOH) 为代表的羟胺作为活性物质广泛参与各种化学和电化学氧化。TEMPOH 的电化学行为对于理解 TEMPO 介导的氧化还原序列的机制至关重要。然而,与对水溶液中 TEMPOH 电化学的大量研究相比,其氧化电位E ox的唯一值据报道,有机溶液中的 (TEMPOH) 为 0.7 V(相对于乙腈中的 Fc),这似乎与实验观察到的 TEMPOH 容易氧化相矛盾。在此,重新研究了 TEMPOH 衍生物在乙腈中的电化学,其氧化电位(约 0 V)比文献中的小得多。酸/碱效应和动力学研究为这些新值提供了可信度。这种 0.7 V 的能量差异促使我们重新审视从旧值推导出的 TEMPOH 的热力学性质和氧化机制。