2-Acetonyl-2,4-di(hydroxy)tetrahydropyrans versus γ-Pyrones: A Chemodivergent Issue for the Condensation of Acetylacetone Dianion Equivalents with α,β-Disubstituted β-Hydroxyaldehydes Leading to Potential New Synthons for Spiroketals - Henryon, Vivien; Liu, Lu Wei; Lopez, Roman; Prunet, Joëlle; Férézou, Jean-Pierre (Synthesis, 2001)