1: PBr3, Py 2: (i) LiNH2, liq. NH3, (ii) /BRN= 1840431/ 3: LiAlH4 / bis-(2-methoxy-ethyl) ether / Heating 4: CrO3, Py View Scheme

1.1: dipyridinium dichromate / dichloromethane / 3 h / Molecular sieve 2.1: magnesium / diethyl ether 2.2: Cooling with ice; Reflux 3.1: pyridine / dichloromethane / 20 °C / Inert atmosphere 4.1: 2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride / hexane / 25 °C / Cooling with liquid nitrogen; Sealed tube; UV-irradiation View Scheme