The Brønsted acid-catalyzed Diels-Alder reaction was examined. Phosphoric acids were effective Brønsted acids for the Diels-Alder reaction of cyclohexadienones and activated by the internal hydrogen-bonding of the adjacent hydroxy group. © 2007 Elsevier B.V. All rights reserved.
Takagi, R., Kondo, A., & Ohkata, K. (2007). Rate acceleration of phosphoric acid-catalyzed Diels-Alder reaction by internal hydrogen-bonding of adjacent hydroxy group. Journal of Molecular Catalysis A: Chemical, 278(1–2), 120–126. https://doi.org/10.1016/j.molcata.2007.08.020