1.1: N-chlorosuccinimide / CCl4 / 15 h / 20 °C 2.1: CH3MgCl / tetrahydrofuran / 0.17 h / -80 °C 2.2: 44 percent / aq. NH4Cl View Scheme

1: N-chlorosuccinimide / CCl4 / 15 h / 20 °C 2: 80 percent / tetrahydrofuran / 1.83 h / -80 - -30 °C View Scheme