Heterogeneous carbon nitride photocatalyst for C-C bond oxidative cleavage of vicinal diols in aerobic micellar medium
Heterogeneous carbon nitride photocatalyst for C-C bond oxidative cleavage of vicinal diols in aerobic micellar medium
复制标题
多相氮化碳光催化剂用于好氧胶束介质中邻位二醇的 C-C 键氧化裂解
DOI：
10.1039/d0gc01727b
复制
发表时间：
2020
期刊：
影响因子：
9.8
通讯作者：
Ni Bangqing
中科院分区：
文献类型：
--
作者：
Niu Tengfei;Chen Shengjun;Hong Mei;Zhang Tianhao;Chen Jiayang;Dong Xinyu;Ni Bangqing
发展了一种绿色高效的可见光促进邻位二醇在胶束介质中好氧氧化C-C键断裂的方法。该方案使用含氮空位的石墨化碳氮化物(CN620)作为无金属可回收光催化剂，CTAB作为水中的表面活性剂。对照实验和ESR结果表明，超氧阴离子自由基和价带空穴在反应中起着重要作用。进一步的同位素实验表明，该反应既有β断裂/HAT途径，也有氧化/水解/脱水途径，这与以往的报道不同。半导体/胶束催化剂体系可以循环使用至少10次，而不会显著降低活性。此外，该反应可以在太阳光照射下进行，并适用于结果相似的大规模反应。
A green and efficient visible-light promoted aerobic oxidative C–C bond cleavage of vicinal diols in micellar medium has been developed. This protocol used graphitic carbon nitride with nitrogen vacancies (CN620) as a metal-free recyclable photocatalyst and CTAB as surfactant in water. Control experiments and the ESR results indicated that superoxide radicals and valence band holes played an important role in the reaction. Further isotope experiments suggested both a β-scission/HAT pathway and an oxidation/hydrolysis/dehydration pathway for the reaction, which is different from previous reports. The semiconductor/micellar catalyst system can be recycled at least 10 times without a significant reduction in activity. Furthermore, this reaction could be carried out under solar light irradiation and was applicable to large-scale reactions with similar results.