1: n-butyllithium; Mo(CO)6 in diethyl ether; hexane T=-60°C; Addition; 2: With boron trifluoride diethyl etherate in diethyl ether; hexane T=-60°C; Substitution; 0.25 h; 3: 3-methyl-acrylic acid,methyl ester in diethyl ether; hexane T=-60 - 20°C; Addition; Further stages.;

tert-butyl (4-benzoyl)perbenzoate in benzene 5 h; Ambient temperatureIrradiation;

1: 88 percent / sodium hydroxide, acetic acid / H2O / 2 h View Scheme

1: 1) n-BuLi / 1) THF, 0 degC, 2) THF, -78 degC, 30 min 2: TFA / 5 h / 20 °C 3: (CO2H)2 / H2O; diethyl ether / 12 h / 20 °C View Scheme

Yield given. Multistep reaction;