1: NaOiPr / propan-2-ol / Heating 2: (i) EtMgHal, Et2O, (ii) /BRN= 102378/ 3: H2, quinoline / Lindlar catalyst / ethyl acetate 4: (i) collidine, (ii) /BRN= 956566/, acetone 5: KNH2, liq. NH3 / pentane 6: pentane / 150 °C View Scheme