Syntheses of γ-Oxo Acids or γ-Oxo Esters by Photooxygenation of Furanic Compounds and Reduction Under Ultrasound: Application to the Synthesis of 5-Aminolevulinic Acid Hydrochloride - Cottier, L; Descotes, G; Eymard, L; Rapp, K (Synthesis, 1995)