The Effect of pH Control on the Selective Ruthenium-Catalyzed Oxidation of Ethers and Alcohols with Sodium Hypochlorite
作者:Luca Gonsalvi、Isabel W. C. E. Arends、Pasi Moilanen、Roger A. Sheldon
DOI:10.1002/adsc.200303124
日期:2003.12
Highly selective oxidations of ethers to esters or lactones and of secondary alcohols to ketones were achieved using catalytic amounts of various Ru precursors and the theoretical amount of NaOCl. Reactions were carried out in biphasic solvent mixtures at constant pH 9–9.5 via either feed-on-demand addition of HCl and NaOH or in the presence of NaHCO3/Na2CO3 buffer. The catalyst could be easily recycled
使用催化量的各种Ru前体和理论量的NaOCl,可以实现醚至酯或内酯的高选择性氧化,以及仲醇至酮的高选择性氧化。通过按需进料添加HCl和NaOH或在NaHCO 3 / Na 2 CO 3缓冲液的存在下,在恒定pH 9-9.5的双相溶剂混合物中进行反应。该催化剂可以容易地再循环至少4次,而选择性只有很小的损失。通常通过简单的相分离和有机溶剂的蒸发来回收产物。还描述了催化剂前体,添加剂和pH控制方法的影响。