1: carbon monoxide With tris-(dibenzylideneacetone)dipalladium(0); triphenylphosphine in tetrahydrofuran T=20°C; P=760.051 Torr; 0.0166667 h; Inert atmosphere; 2: cyclopent-2-enone With chloro-trimethyl-silane in tetrahydrofuran T=20°C; 0.166667 h; 3: diethylzinc in tetrahydrofuran T=20°C;

1: 1.) lithium-diisopropylamide, 2.) HMPT, LiBr / 1.) THF, hexane, 2.) -78 deg C, 30 min, THF 2: aq. HCl / 40 h / 20 - 25 °C View Scheme

Alox B; dihydrogen peroxide; potassium carbonate 1.) 60 deg C; Yield given. Multistep reaction;