Significant differences are observed in the reaction rates and the product distribution in the alkylation reactions of ethyl 5-hydroxy chromone-2-carboxylate with primary and secondary alkyl halides under thermal, PTC and ultrasonic conditions.
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Mason, T. J., Lorimer, J. P., Paniwnyk, L., Harris, A. R., Wright, P. W., Bram, G., ... Sansoulet, J. (1990). The O-Alkylation of 5-Hydroxy Chromones. A Comparison of Two Non-Classical Techniques, PTC in the Absence of Solvent and Sonochemical Activation in Polar Aprotic Solvents. Synthetic Communications, 20(22), 3411-3420. https://doi.org/10.1080/00397919008051582