Reversibility and reactivity in an acid catalyzed cyclocondensation to give furanochromanes - a reaction at the "oxonium-Prins' vs. "ortho-quinone methide cycloaddition' mechanistic nexus - Nielsen, CD-T; Mooij, WJ; Sale, D; Rzepa, HS; Bures, J; Spivey, AC (Chemical Science, 2019)