lithium hydroxide hydrate in N,N-dimethyl-formamide T=0 - 5°C; Mukaiyama-Michael reaction; Inert atmosphere;

Ph3C+ClO4- in dichloromethane T=-78°C;

aluminum cation-exchanged montmorillonite in dichloromethane T=-10°C; 1 h;

1: [(1-methoxy-2-methyl-1-propenyl)oxy]trimethylsilane; dicarbonyl(η5-cyclopentadienyl)[(1,2-η)propene]iron(II) tetrafluoroborate in dichloromethane T=0 - 20°C; 16 h; 2: methanol; carbon monoxide With ammonium cerium(IV) nitrate T=-78 - 20°C;

1: 52 percent / aluminum ion-exchanged montmorillonite / CH2Cl2 / 1 h / -10 °C 2: 1M HCl / Ambient temperature View Scheme

titanium tetrachloride 1.) CH2Cl2, 0.5 h, -80 deg C; Yield given. Multistep reaction;