1: NaH / 1,2-dimethoxy-ethane 2: H2 / PtO2 / ethanol 3: NaH / 1,2-dimethoxy-ethane 4: aq. KOH / methanol 5: H2SO4 / 1,2-dichloro-ethane 6: Al(OiPr)3 7: aq. KOH / ethanol 8: diethyl ether 9: Py 10: aq. KOH, Py / ethanol 11: KOtBu / dimethylsulfoxide 12: MeLi / diethyl ether View Scheme