1: mono-methyl malonate potassium salt With triethylamine; magnesium chloride in acetonitrile T=0°C; 0.5 h; 2: 2-methyl-acryloyl chloride in acetonitrile T=0°C; 0.5 h; 3: With hydrogenchloride in water T=0°C; 0.75 h;

1: AlCl3 / diethyl ether 2: NaH / 1,2-dimethoxy-ethane 3: (pyrolysis) View Scheme

1: NaH / 1,2-dimethoxy-ethane 2: (pyrolysis) View Scheme

(pyrolysis);