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Journal Article

The cooperative role of zwitterions and phosphotungstate anion in epoxidation reaction

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Qiao,  Yunxiang
Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology;
Service Department Theyssen (Technical Labs), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Theyssen,  Nils
Service Department Theyssen (Technical Labs), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Leitner,  Walter
Service Department Leitner (Technical Labs), Max-Planck-Institut für Kohlenforschung, Max Planck Society;
Institut für Technische und Makromolekulare Chemie, Lehrstuhl für Technische Chemie und Petrolchemie, RWTH Aachen;

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Citation

Qiao, Y., Hua, L., Chen, J., Theyssen, N., Leitner, W., & Hou, Z. (2013). The cooperative role of zwitterions and phosphotungstate anion in epoxidation reaction. Journal of Molecular Catalysis A: Chemical, 380, 43-48. doi:10.1016/j.molcata.2013.09.020.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0014-A286-B
Abstract
The combination of a certain zwitterion and sodium phosphotungstate provided an excellent catalyst for the epoxidation of cyclooctene: high TON was available even without any solvents and under ice bath condition. Based on characterizations by 1H, 13C and 31P NMR as well as FT-IR, Raman and UV–vis methods and investigations on the catalytic performance of the binary system, strong cooperative effect between zwitterions and sodium phosphotungstate was demonstrated. Here, the formation of stable W/O emulsion by the amphiphilic zwitterions seems to be crucial, which allows cyclooctene being in sufficient contact with the active phosphotungstate anions in the water phase.