Solvent and Temperature Effects in the Free Radical Aerobic Oxidation of Alkyl and Acyl Aromatics Catalysed by Transition Metal Salts and <i>N</i>-Hydroxyphthalimide: New Processes for the Synthesis of <i>p</i>-Hydroxybenzoic Acid, Diphenols, and Dienes for Liquid Crystals and Cross-Linked Polymers
作者:Francesco Minisci、Francesco Recupero、Andrea Cecchetto、Cristian Gambarotti、Carlo Punta、Roberto Paganelli、Gian Franco Pedulli、Francesca Fontana
DOI:10.1021/op034137w
日期:2004.3.1
oxidation. This is related to the ratio between the rate of β-scission of the alkoxyl radical, which leads to acetophenone derivatives, and the rate of hydrogen atom abstraction, leading to tertiary benzyl alcohols. These latter are efficiently converted either to diphenols for the production of liquid crystals, by reaction with H2O2, or to dienes, useful as cross-linking agents, by dehydration. The aerobic
在 N-羟基邻苯二甲酰亚胺和 Co(II) 盐的催化下,4,4'-二异丙基联苯和 2,6-二异丙基萘的有氧氧化得到相应的叔苄醇,在温和条件下(温度 30-60°)具有高转化率和选择性C 和大气压)。由于 C. Walling 的开创性工作以及最近 KU Ingold 及其同事在定量动力学基础上的结论性解决方案,溶剂和温度效应强烈影响有氧氧化的选择性。这与生成苯乙酮衍生物的烷氧基的 β 断裂速率与生成叔苯甲醇的氢原子夺取速率之间的比率有关。这些后者被有效地转化为二酚以生产液晶,通过与 H2O2 反应,或通过脱水反应生成可用作交联剂的二烯。Mn(NO3)2和Co(NO3)2催化对羟基苯乙酮有氧氧化...