methyllithium; tert.-butyl lithium 1.) a) hexane, THF, -78 deg C, 30 min, b) -15 deg C, 3 h, 2.) RT, overnight; Yield given. Multistep reaction;

1: 1.) MeLi, t-BuLi / 1.) a) hexane, THF, -78 deg C, 30 min, b) -15 deg C, 3 h, 2.) RT, overnight 2: 85 percent / conc. HCl / 14 h / 105 °C View Scheme