1: LiAlH4 / tetrahydrofuran 2: Py 3: (i) 1,3-dibromo-5,5-dimethyl-imidazolidine-2,4-dione, hexane, (ii) P(OMe)3, xylene 4: aq. KOH / methanol; benzene 5: (i) EtOH, (UV-irradiation), (ii) (heating) View Scheme