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Third-liquid phase-transfer catalyzed esterification of sodium benzoate with novel dual-site phase-transfer catalyst under ultrasonic irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
51726 46851 2011 6 PDF Available
Title
Third-liquid phase-transfer catalyzed esterification of sodium benzoate with novel dual-site phase-transfer catalyst under ultrasonic irradiation
Abstract

The green process for esterification of sodium benzoate and 2-phenoxyethyl bromide by ultrasound-assisted third-liquid phase-transfer catalysis (TLPTC) with novel dual-site phase-transfer catalyst 1,4-bis(trihexylammoniomethyl)benzene dibromide (BTHAMBB) was developed. BTHAMBB was synthesized by reacting p-xylylene dibromide with trihexylamine, and had specific feature to form third-liquid phase without extra inorganic salts. In this TLPTC system, the overall reaction rate with ultrasound irradiation was higher by 25% than that at silence condition. The product yield of esterification without catalyst at 60 °C and 300 rpm was only 2% in 4 h of reaction even under 28 kHz/300 W of ultrasonic irradiation, but was raised to 72.7% by using third-liquid phase, which contained above 97% of added BTHAMBB with highly concentrated catalytic intermediate (0.6–0.7 M), demonstrating the good catalytic efficiency of BTHAMBB for TLPTC.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A novel and active dual-site phase-transfer catalyst BTHAMBB was synthesized. ► The catalyst BTHAMBB can form the third-liquid phase without adding extra salts. ► Above 97% of catalyst was concentrated in a small volume of the third-liquid phase. ► The product yield 72.7% in 4 h of reaction was achieved with the third-liquid phase. ► The green esterification catalyzed by BTHAMBB under ultrasound was developed.

Keywords
Phase-transfer catalysis; Dual-site phase-transfer catalyst; Third-liquid phase; Ultrasound irradiation; Esterification; Ether–ester
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Third-liquid phase-transfer catalyzed esterification of sodium benzoate with novel dual-site phase-transfer catalyst under ultrasonic irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 14, Issue 1, 25 October 2011, Pages 101–106
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
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