通过简单,有效且对环境有益的方法将各种硫化物选择性氧化为亚砜是首要目标。在本文中,我们探索了一种高效的方案,用于在70%t存在下将La 2 O 3催化的烷基芳基硫醚氧化为亚砜的高选择性。-BuOOH溶液(水)。我们主要获得单加氧产物。在这些条件下未观察到硫化物过度氧化为砜。在不使用配体和其他添加剂的情况下,在合理的时间内以良好至极好的收率获得了所得产物。用烯丙基硫未观察到双键的环氧化以及烯丙基氧化。可以通过改变反应条件来定量获得砜。通过XRD,AFM和SEM技术对表面形貌和催化剂的可重复使用性进行了验证。使用BET等温线测量La 2 O 3的表面积。
作者:Jiayan He、Guangle Chen、Benxiang Zhang、Yi Li、Jia-Rong Chen、Wen-Jing Xiao、Feng Liu、Chaozhong Li
DOI:10.1016/j.chempr.2020.02.003
日期:2020.5
radical C(sp3)-sulfonylation remains elusive. Herein, we report the decarboxylative radical sulfonylation with sulfinates. With the merger of 4CzIPN (1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene) and Cu(OTf)2 as catalysts, the visible-light-induced reaction of redox-active esters of aliphatic carboxylic acids with organosulfinates at room temperature provides the corresponding decarboxylative
A new protocol for the directsulfonylation of benzylic, allylic and homoallylic alcohols with sodiumarenesulfinates is described by using iron(III) chloride as a catalyst and chlorotrimethylsilane as an additive. This method requires no preactivation of alcohols. Surprisingly in the reaction with homoallyl alcohols nucleophilic addition of sulfinate anion, occurs at the terminal double bond instead
Organic Reactions in Ionic Liquids: A New Method for the Synthesis of Alkyl Aryl Sulfones by Alkylation of Sodium Arenesulfinates with Unactivated Alkyl Chlorides
作者:Yi Hu、Zhen‐Chu Chen、Zhang‐Gao Le、Qin‐Guo Zheng
DOI:10.1081/scc-200034831
日期:2004.12.31
Abstract A newmethod is reported for the synthesis of alkyl aryl sulfones by alkylation of sodium arenesulfinates with unactivated alkyl chlorides using ionic liquid based on 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BmimBF4) mixed with water (2:1) as reaction media. The ionic liquid can be reused and the procedure gives the sulfones in moderate yields.
Elimination–addition. Part XIII. Reactions of ω-bromoalkyl p-tolyl sulphones with bases: the role of inductive effects in elimination and substitution
作者:A. C. Knipe、C. J. M. Stirling
DOI:10.1039/j29670000808
日期:——
Rates of reaction of a series of sulphones, p-Me·C6H4·SO2·[CH2]n·Br (n= 3–6) with sodium ethoxide in ethanol and with potassium t-butoxide in t-butyl alchol have been measured. Three types of reaction occur, namely substitution (ethoxide reactions only), elimination, and cyclisation. Quantitative analysis of the products allows dissection of the overall rate constants into the respective rate constants
一系列砜p- Me·C 6 H 4 ·SO 2 ·[CH 2 ] n ·Br(n = 3-6)与乙醇中的乙醇钠和叔丁基中的叔丁醇钾的反应速率酒精已被测量。发生三种类型的反应,即取代(仅乙醇反应),消除和环化。产物的定量分析允许将每个系统中每种反应类型的总速率常数分解为各自的速率常数。