1: With tert.-butylhydroperoxide; 3 A molecular sieve in decane; ethyl acetate T=20°C; 0.5 h; 2: With manganese triacetate in decane; ethyl acetate T=20°C; 48 h; Further stages.;

pyridine; 4-(N,N-dimethlyamino)pyridine; TPP; oxygen; acetic anhydride in dichloromethane 2 h; Irradiation; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

hydrogen; palladium on activated charcoal in methanol T=20°C;