Silicaphosphine (Silphos), [P(Cl)3−n(SiO2)n], as a new heterogeneous reagent is introduced. This reagent converts alcohols and thiols to their corresponding bromides and iodides in the presence of X2 (X=Br, I) in refluxing CH3CN in high to quantitative yields. Use of Silphos provides a highly practical method for the easy separation of the Silphos oxide byproduct by a simple filtration.
引入了一种新型的异质试剂
硅膦(Silphos)[P(Cl)3− n(SiO 2)n ]。在X 2(X = Br,I)存在下,在回流的CH 3 CN中,该试剂可以高产率到定量产率将醇和
硫醇转化为其相应的
溴化物和
碘化物。Silphos的使用为通过简单过滤轻松分离Silphos氧化物副产物提供了一种高度实用的方法。