A peroxotungstate-ionic liquid brush assembly: an efficient and reusable catalyst for selectively oxidizing sulfides with aqueous H2O2 solution in neat water
作者:Xianying Shi、Wenjuan Ma、Hui Ou、Xiaoyan Han、Congmin Lu、Yan Chen、Junfa Wei
DOI:10.1590/s0103-50532012005000012
日期:——
An efficient and reusable heterogeneous catalytic assembly of peroxotungstate held in a ionic liquid (IL) brush was synthesized and an environmentally-friendly procedure was developed for selective oxidation of sulfides at room temperature using 30 wt.% hydrogen peroxide as the terminal oxidant and water as a sole solvent. No organic co-solvent or other additive was needed. A 1.5-2.0 mol% (based on
合成了一种高效且可重复使用的过氧化钨酸盐的多相催化组件,该组件装在离子液体(IL)刷子中,并开发了一种环境友好的程序,可在室温下使用30 wt。%的过氧化氢作为末端氧化剂,并用水作为硫化物选择性氧化唯一的溶剂。不需要有机助溶剂或其他添加剂。发现1.5-2.0摩尔%(基于W原子)的负载催化剂足以进行平滑和清洁的反应。通过简单地控制过氧化氢的当量,脂族和芳族硫化物都被有效地和选择性地转化为它们各自的亚砜或砜。除了高催化活性外,该催化剂还显示出优异的化学选择性。敏感的官能团,例如双键和羟基,即使在过量的过氧化氢下,反应仍保持在氧化条件下。催化剂易于回收(通过简单过滤)并重复使用至少八次,而活性没有明显下降。