哌啶类立体受阻胺化合物非均相催化氧化工艺研究

以负载Sn(Ⅱ )离子的离子交换树脂为催化剂合成哌啶类氮氧自由基 ,产率达到 98%以上。催化剂易于回收 ,重复使用 10次后 ,氮氧自由基产率仍达 97%以上。提出了该反应的反应机理 ,得到的最佳工艺条件为 :H2 O2 与 4 取代 2 ,2 ,6 ,6 四甲基哌啶的物质的量比为 1.6∶1 0 ,催化剂用量为 4 取代 2 ,2 ,6 ,6 四甲基哌啶质量的 5 % ,反应温度 70～ 75℃ ,反应时间 10h。

Study of Inhomogeneous Catalytic Oxidation Reaction of Piperidine Sterically Hindered Amine Compounds

Piperidine sterically hindered amine free radicals were s ynthesized,catalyzed by ion-exchange resin supported Sn(Ⅱ).The yield of fr ee ra dical was more than 98%.The catalyst was prone to be recycled and after being re used 10 times,the yield of free radical was above 97% yet.The reaction mecha nism was put forward.The optimal reaction conditions obtained were:mole ratio of H2O2 to 4-substitute-2,2,6,6-tetramethylpiperidine 1.6∶1.0，amou nt of catalyst used 5%(based on the amount of 4-substitute-2,2,6,6-tetram ethylpiperidine)，reaction temperature 70～75 ℃　and reaction time 10 h.