triphenylphosphine; iodine in tetrahydrofuran; hexane; ethyl α-hydroxycyclopropaneacetate; 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran

1: 2-cyclopropyl-acetic acid With thionyl chloride in 1,2-dichloro-ethane T=25°C; 2 h; Reflux; 2: With N-bromosuccinmide; hydrogen bromide in water; 1,2-dichloro-ethane T=25°C; 72 h; 3: ethanol in water; 1,2-dichloro-ethane T=20°C; 1 h;