aluminium trichloride in 1,2-dichloro-ethane T=25°C; Acetylation; 2 h;

Rh(acac)(cyclooctene)(PCy3) in benzene-d6 Ar-atmosphere; 48 h at room temp.;

hydrogen iodide; tetra-(n-butyl)ammonium iodide in toluene reagents mixed and stirred at 0°C for 1 h, washed with aqueous NaHCO3, organic layer treated with aqueous KF; purified by column chromy.;