1: With oxalyl dichloride; N,N-dimethyl-formamide in dichloromethane T=20°C; 4 h; 2: With AlCl3, aluminium chloride in 1,2-dichloro-ethane 1 h; Reflux;

1.1: magnesium; methanol / 72 h / 20 °C / Cooling with ice 2.1: oxalyl dichloride / N,N-dimethyl-formamide / dichloromethane / 4 h / 20 °C 2.2: 1 h / Reflux View Scheme

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