[EN] PERFECTED PROCESS FOR THE PREPARATION OF STABLE NITROXIDE RADICALS<br/>[FR] PROCEDE PERFECTIONNE POUR LA PREPARATION DE RADICAUX NITROXYDE STABLES
申请人:POLIMERI EUROPA SPA
公开号:WO2006029697A1
公开(公告)日:2006-03-23
Process for the preparation of stable nitroxide radicals (I) starting from N-benzylphthalimide in three steps. In the first step, the N-benzylphthalimide is transformed into N-benzyl-1,1,3,3-tetralkylisoindoline by treatment with a Grignard reagent prepared in methyl-tert-butyl ether. In the second step, the N-benzyl-1,1,3,3-tetraalkylisoindoline is transformed into 1,1,3,3-tetraalkylisoindoline by hydrogenolysis. In the third step, the 1,1,3,3-tetra-alkyl-isoindoline is transformed into the nitroxide radical by oxidation with hydrogen peroxide in the presence of a catalyst selected from acids and salts of polymolybdic or polytungstic acids.
从N-苄基邻苯二甲酰亚胺开始,通过三个步骤制备稳定的亚硝基自由基(I)。在第一步中,N-苄基邻苯二甲酰亚胺通过与在甲基-叔丁基醚中制备的格氏试剂反应转化为N-苄基-1,1,3,3-四烷基异吲哚。在第二步中,N-苄基-1,1,3,3-四烷基异吲哚通过氢解反应转化为1,1,3,3-四烷基异吲哚。在第三步中,1,1,3,3-四烷基异吲哚通过在存在酸和聚钼酸盐或聚钨酸盐催化剂的条件下与过氧化氢氧化转化为亚硝基自由基。