Second-Generation meta-Phenolsulfonic Acid–Formaldehyde Resin as a Catalyst for Continuous-Flow Esterification

Second-Generation meta-Phenolsulfonic Acid–Formaldehyde Resin as a Catalyst for Continuous-Flow Esterification

A second-generation m-phenolsulfonic acid–formaldehyde resin (PAFR II) catalyst was prepared by condensation polymerization of sodium m-phenolsulfonate and paraformaldehyde in an aqueous H2SO4 solution. This reusable, robust acid resin catalyst was improved in both catalytic activity and stability,...

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Bibliographic Details
Published in:Organic letters Vol. 22; no. 1; pp. 160 - 163
Main Authors: Hu, Hao, Ota, Hajime, Baek, Heeyoel, Shinohara, Kenta, Mase, Toshiaki, Uozumi, Yasuhiro, Yamada, Yoichi M. A
Format: Journal Article
Language:English
Published: United States American Chemical Society 03-01-2020
Online Access:Get full text
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Summary:A second-generation m-phenolsulfonic acid–formaldehyde resin (PAFR II) catalyst was prepared by condensation polymerization of sodium m-phenolsulfonate and paraformaldehyde in an aqueous H2SO4 solution. This reusable, robust acid resin catalyst was improved in both catalytic activity and stability, maintaining the characteristics of the previous generation catalyst (p-phenolsulfonic acid–formaldehyde resin). PAFR II was applied in the batchwise and continuous-flow direct esterification without water removal and provided higher product yields in continuous-flow esterification than any other commercial ion-exchanged acid catalyst tested.
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ISSN:1523-7060
1523-7052
DOI:10.1021/acs.orglett.9b04084