Normal phase transfer catalysis, particularly of esterification and etherification reactions, is inhibited if free acids (e.g. phenols or carboxylic acids) are present in the system; since free acids are generated by aqueous phase hydrolysis a controlled basic pH is recommended for these processes.
H. A. Zahalka and Y. Sasson, J. Chem. Soc., Chem. Commun., 1984, 1581 DOI: 10.1039/C39840001581
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