One-Pot Synthesis of α-Alkylidene-γ-butyrolacton-2-ones (Tetronic Acid Derivatives): Polar Solvent Induces a New Type of γ-Lactonization - Alizadeh, Abdolali; Sabahnoo, Hamideh; Noaparast, Zohreh; Zohreh, Nasrin; Mikaeili, Azadeh (Synlett, 2010)