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Phosphonium ionic liquids as highly thermal stable and efficient phase transfer catalysts for solid–liquid Halex reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
55218 47043 2012 5 PDF Available
Title
Phosphonium ionic liquids as highly thermal stable and efficient phase transfer catalysts for solid–liquid Halex reactions
Abstract

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.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (188 K)Download as PowerPoint slideHighlights► 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.

Keywords
Ionic liquids; Phase transfer catalyst; Phosphonium ion; Halex reaction; KF; Chloronitrobenzenes
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Phosphonium ionic liquids as highly thermal stable and efficient phase transfer catalysts for solid–liquid Halex reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 198, Issue 1, 30 December 2012, Pages 300–304
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us