1: 79 percent / 1) t-BuOK / 1,2-dimethoxy-ethane / 1) -30 deg C, 2) -30 to 20 deg C, 1 h 2: 91 percent / diethyl ether; aq. HCl / 20 °C / shake for 1-5 min View Scheme

1: 69 percent / 1) t-BuOK / 1,2-dimethoxy-ethane / 1) -30 deg C, 2) -30 to 20 deg C, 1 h 2: 90 percent / diethyl ether; aq. HCl / 20 °C / shake for 1-5 min View Scheme