potassium tert-butylate in N,N-dimethyl-formamide T=0 - 5°C; 0.0833333 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

potassium tert-butylate in N,N-dimethyl-formamide T=0 - 5°C; 0.0833333 h; Yield given. Yields of byproduct given;

Multi-step reaction with 2 steps 1: 66 percent / 2 M NaOH / ethanol; H2O / 1 h / 20 °C2: 1.) 2.2 M n-BuLi / 1.) THF, -70 deg C, 15 min, 2.) THF, -70 to -50 deg C, 60 min  

With  potassium tert-butylate in  N,N-dimethyl-formamide T=0 - 5°C; 0.0833333 h;