trichloroisocyanuric acid; iodine in dichloromethane T=20°C;

1.1: N,N,N',N'-tetramethylethylenediamine; sec-BuLi / tetrahydrofuran / 1.5 h / -78 °C 1.2: I2 / tetrahydrofuran / 0.5 h / -78 °C 2.1: 2N aq. NaOH / methanol / 96 h / Heating View Scheme

hydrogen iodide; epoxysulfonyl fluoride; lead dioxide 1.)-72 deg C, 3 h; Yield given. Multistep reaction. Yields of byproduct given;

palladium diacetate; potassium carbonate in water; N,N-dimethyl-formamide T=20°C; 6 h;