potassium tert-butylate in tert-butyl alcohol; benzene 3 h; Heating;

1: 62 percent / NaH, KF / dimethylformamide / 24 h / Ambient temperature 2: 87 percent / t-BuOK / 2-methyl-propan-2-ol; benzene / 3 h / Heating View Scheme

dichloro(cycloocta-1,5-diene)palladium(II) in acetonitrile 24 h; Ambient temperature;