1: 7 percent / O2NC6H4CHON(t-C4H9) (1), 18-crown-6, potassium tert-butoxide / 2-methyl-propan-2-ol / 72 h / 25 °C 2: m-chloroperoxybenzoic acid / CH2Cl2 / 2 h / 0 °C 3: 15 percent / 2,6-dimethylphenol, potassium tert-butoxide, 18-crown-6 / 2-methyl-propan-2-ol / 72 h / 25 °C 4: 4 percent / potassium tert-butoxide / 2-methyl-propan-2-ol; CHCl3 / 72 h / Ambient temperature View Scheme

potassium tert-butylate in chloroform; tert-butyl alcohol 72 h; Ambient temperature;

1: 15 percent / 2,6-dimethylphenol, potassium tert-butoxide, 18-crown-6 / 2-methyl-propan-2-ol / 72 h / 25 °C 2: 4 percent / potassium tert-butoxide / 2-methyl-propan-2-ol; CHCl3 / 72 h / Ambient temperature View Scheme

1: m-chloroperoxybenzoic acid / CH2Cl2 / 2 h / 0 °C 2: 15 percent / 2,6-dimethylphenol, potassium tert-butoxide, 18-crown-6 / 2-methyl-propan-2-ol / 72 h / 25 °C 3: 4 percent / potassium tert-butoxide / 2-methyl-propan-2-ol; CHCl3 / 72 h / Ambient temperature View Scheme

1: 7 percent / O2NC6H4CHON(t-C4H9) (1), potassium tert-butoxide / 2-methyl-propan-2-ol / 72 h / 25 °C 2: 4 percent / potassium tert-butoxide / 2-methyl-propan-2-ol; CHCl3 / 72 h / Ambient temperature View Scheme