Copper(II) and cobalt(II) tetrazole-saccharinate complexes as effective catalysts for oxidation of secondary alcohols
作者:Luís M.T. Frija、Elisabete C.B.A. Alegria、Manas Sutradhar、M. Lurdes S. Cristiano、Amin Ismael、Maximilian N. Kopylovich、Armando J.L. Pombeiro
DOI:10.1016/j.molcata.2016.10.023
日期:2016.12
Abstract Mononuclear Cu(II) and Co(II) complexes comprising 2-methyltetrazole-saccharinate bidentate N,N-chelating ligand have been synthesized for the first time and tested as homogeneous catalysts for oxidation of secondary alcohols in a solvent-free and microwave assisted protocol using aqueous tert-butyl hydroperoxide (TBHP) as oxidant. The developed catalytic system exhibits broad functional group
摘要 首次合成了包含 2-甲基四唑-糖精二齿 N,N-螯合配体的单核 Cu(II) 和 Co(II) 配合物,并在无溶剂和微波辅助条件下作为均相催化仲醇氧化进行了测试。使用含水叔丁基过氧化氢 (TBHP) 作为氧化剂的协议。开发的催化体系表现出广泛的官能团相容性,允许将各种仲醇(包括烯丙醇)高效和选择性地转化为相应的酮。催化剂的典型含量为 0.2 mol%,在 20-50 W 微波照射下,大多数反应在 10 分钟内完成,TON 高达 5.5 × 102 和 TOF 高达 1.1 × 104 h-1。没有使用添加剂和助氧化剂,而 TEMPO (2,2,6, 6-tetramethyl-1-piperidinyloxyl) 在大多数情况下充当抑制剂。概述了涉及新催化系统的合理反应机制。