Reaction of resorcinol and its derivatives with urea acetals. Khakimov, M., S., Gazizov, A., S., Burilov, A., R., Pudovik, M., A., & Konovalov, A., I. Russian Journal of General Chemistry, 79(6):1163-1166, 2009.
Reaction of resorcinol and its derivatives with urea acetals [pdf]Paper  Reaction of resorcinol and its derivatives with urea acetals [pdf]Website  abstract   bibtex   
Reaction of 2-methylresorcinol and pyrogallol with urea acetals of various structures was studied. Depending on the structure of the acetal used, reaction was established to result in eiter calix[4]resorcinols containing urea fragment or in imidazolidin-2-one derivatives.

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