oxygen; isobutyraldehyde; bis(3-methyl-2,4-pentanedionato)nickel(II) in 1,2-dichloro-ethane 6 h; Ambient temperature;

lithium tri-n-butylmanganate 1) THF, -78 - 0 deg C, 3 h, 2) DMSO, 0 deg C - room temperature, 2 h; Yield given. Multistep reaction;

1: CH3CBr2CO2Et With tert.-butyl lithium in tetrahydrofuran T=-78 - 0°C; 3.5 h; 2: 2-(tert-Butyl-dimethyl-silanyloxy)-1-phenyl-propan-1-one in tetrahydrofuran T=20°C; 0.5 h; 3: With hydrogenchloride in ethanol Further stages.;

lithium tri-n-butylmanganate 1) THF, -78 - 0 deg C, 3 h, 2) DMSO, 0 deg C - room temperature, 2 h; Yield given. Multistep reaction;