pyridine; 2-hydroxy-1,3-isoindolinedione; sodium perchlorate in acetonitrile Ambient temperatureelectrolysed potentiostatically (0.85 V vs. SCE);

toluene-4-sulfonic acid in benzene T=80°C; 2 h;

toluene-4-sulfonic acid

1: 1.) 9-BBN, 2.) 6 N NaOH, 30percent H2O2 / 1.) THF, room temp., 2 h, 2.) 50 deg C, 1 h 2: toluene / 24 h / Heating 3: 0.1 N HCl / Ambient temperature 4: toluene / pH = 8.4; buffer: LiOH, 85percent aq. H3PO4, CH3COOH, B(OH)3 View Scheme