1: 40 percent / 1.6 M n-BuLi / hexane; tetrahydrofuran / -78 deg C to 20 deg C, 3 h, 20 deg C, 8 d 2: 1.) lithium powder, 5 molpercent 4,4'-di-tert-butylbiphenyl; 2.) H2O / 1.) THF, -15 deg C, 7 h; 2.) THF, -15 deg C to 20 deg C, 3 h View Scheme

n-butyllithium in tetrahydrofuran; hexane -78 deg C to 20 deg C, 3 h, 20 deg C, 8 d;

caesium carbonate in N,N-dimethyl-formamide T=20°C;

potassium iodide in acetonitrile T=110°C; 0.25 h; Microwave irradiation;

n-butyllithium; 4,4'-di-tert-butylbiphenyl; lithium 1.) THF, hexane, -15 deg C, 30 min; 2.) THF, hexane, -15 deg C to 20 deg C, 3 h; Multistep reaction;