Tang Zhilin, Xiao Jin, Li Fei, Ma Zhanhu, Wang Li, Niu Fanfan, Sun Xiaoling
School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
ACS Omega. 2020 Apr 9;5(18):10451-10458. doi: 10.1021/acsomega.0c00443. eCollection 2020 May 12.
Cobalt-Tetraamide-Phthalocyanine (CoTaPc) immobilized onto magnetic FeO chitosan microspheres (FeO/CTO) was synthesized via a simple immersion method, which is an efficient catalyst for the oxidation of cyclic ketones to lactones with O/benzaldehyde as the oxidant. The CoTaPc-FeO/CTO catalyst was applied for the first time in the Baeyer-Villiger (B-V) oxidation reaction. Characterization results obtained from X-ray diffraction, UV-vis, Fourier transform infrared, and scanning electron microscopy showed that the combination of CoTaPc and magnetic FeO/CTO microspheres was achieved. The catalyst could be easily separated from the reaction system with an external magnet and reused several times without the remarkable loss of activity. In addition, a possible radical mechanism for the B-V oxidation in this catalytic system is proposed and verified by controlled experiments.
通过简单的浸渍法合成了负载在磁性FeO壳聚糖微球（FeO/CTO）上的钴-四酰胺-酞菁（CoTaPc），它是以氧气/苯甲醛为氧化剂将环酮氧化为内酯的高效催化剂。CoTaPc-FeO/CTO催化剂首次应用于拜耳-维立格（B-V）氧化反应。通过X射线衍射、紫外可见光谱、傅里叶变换红外光谱和扫描电子显微镜获得的表征结果表明，CoTaPc与磁性FeO/CTO微球实现了结合。该催化剂可以很容易地用外部磁铁从反应体系中分离出来，并重复使用几次而活性没有明显损失。此外，还提出了该催化体系中B-V氧化可能的自由基机理，并通过对照实验进行了验证。
