کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
55218 | 47043 | 2012 | 5 صفحه PDF | دانلود رایگان |
Trihexyl (tetradecyl) phosphonium tetrafluoroborate was found to be an active catalyst for the introduction of fluoride by nucleophilic aromatic substitution. With a decomposition temperature above 300 °C, this ionic liquid is suitable for reactions at high temperatures. The addition of 1 mol% of the ionic liquid relative to KF increased the initial rate for the fluorination of 1,2-dichloro-4-nitrobenzene six-fold compared to the uncatalysed reaction. The highest reaction rate was observed at 20 mol% ionic liquid relative to KF. Ease of handling without the need for stringent drying conditions and reuseability make this ionic liquid a useful phase transfer catalyst.
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► Trihexyl (tetradecyl) phosphonium tetrafluoroborate as an active phase transfer catalyst in Halex reactions using KF.
► Reaction rate increased even at low loadings.
► Reactions can be carried out at high temperatures due to high thermal stability.
► Green system due to ease of reuse with minimal loss of activity.
Journal: Catalysis Today - Volume 198, Issue 1, 30 December 2012, Pages 300–304