18-crown-6 ether in tetrahydrofuran; ethylene glycol dimethyl ether Ambient temperature;

1: 14 percent / K, 18-crown-6 / tetrahydrofuran; 1,2-dimethoxy-ethane / Ambient temperature 2: 1.) dichloromethane, 20 deg C, 5 h, 2.) 20 deg C, 17 h 3: 4 percent / K, 18-crown-6, t-BuNH2 / tetrahydrofuran / Ambient temperature View Scheme

18-crown-6 ether in tetrahydrofuran; ethylene glycol dimethyl ether Ambient temperature;