aluminium trichloride in n-heptane T=5 - 10°C;

AlCl3, aluminium chloride in n-heptane T=5°C; 12 h;

1: phenylacetic acid, ethyl ester; γ-chlorobutyryl chloride With AlCl3, aluminium chloride in dichloromethane T=40°C; Cooling with ice; 2: ethanol With hydrogenchloride in toluene T=70°C;

lithium hydroxide in ethanol; water T=20°C; 19 h;