Co-NC-900催化氧化烯烃C=C断裂合成酯

Co⁃NC⁃900 Catalyzed Oxidation of Alkenes Synthesis of Esters via Unsaturated C=C Cleavage

以钴纳米颗粒(Co-NC-900)为催化剂、氧气为氧化剂,使烯烃中C=C断裂,合成了酯类化合物。该催化体系具有广泛的底物适用范围以及官能团兼容性,多种单取代或多取代的芳香族和脂肪族烯烃可以顺利地通过C=C断裂转化为相应的酯。此外,催化剂经过6次回收利用,无明显活性损失。通过表征发现,纳米结构的氮掺杂石墨烯层包覆的钴纳米颗粒具有优异的催化活性。机理研究结果表明,在氧化条件下,当烯烃生成的醇或酮作为中间体时,醇和酮可以通过串联的氧化过程转化为酯。

A new method for the synthesis of esters by C=C bond breaking in olefins has been realised using cobalt nanoparticles(Co⁃NC⁃900)as catalysts and oxygen as oxidant.The catalytic system has a wide range of substrate applications and functional group compatibility.A diverse set of mono⁃and multi⁃substituted aromatic and aliphatic alkenes could be effectively cleaved and converted into the corresponding esters by C=C bond cleavage.In addition,the catalyst can be recycled up to six times without significant loss of activity.Characterization analysis revealed nanostructured nitrogen⁃doped graphene⁃layer coated cobalt nanoparticleis possibly responsible for excellent catalytic activity.Mechanistic studies revealed that alcohols or ketones derived from olefins under oxidative conditions are formed as intermediates,which subsequently are converted to esters through a tandem sequential process.