کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
65492 | 48393 | 2013 | 6 صفحه PDF | دانلود رایگان |
• The combination of zwitterion and phosphotungstate constructed a catalyst.
• The combined catalyst exhibited high TON and TOF values for expoxidation.
• The epoxidation can be performed under solventless and ice bath conditions.
• Strong cooperative effect existed between zwitterions and phosphotungstate.
• The formation of W/O emulsion by the zwitterion facilitated the reaction.
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.
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Journal: Journal of Molecular Catalysis A: Chemical - Volume 380, December 2013, Pages 43–48