sulfuric acid in water T=100°C; 0.25 h; Inert atmosphereSchlenk technique;

1: hydroxylamine hydrochloride; sodium sulfate / water; ethanol / 12 h / 80 °C / |Inert atmosphere; |Schlenk technique 2: sulfuric acid / water / 0.25 h / 100 °C / |Inert atmosphere; |Schlenk technique View Scheme

dihydrogen peroxide; sodium hydroxide in water T=50°C; 0.5 h; Inert atmosphereSchlenk technique;

1: 4,7-Dichloro-1H-indole-2,3-dione With N-[3,5-bis(trifluoromethyl)phenyl]-N'-[(9R)-6'-methoxycinchonan-9-yl]thiourea in tetrahydrofuran T=5°C; 0.166667 h; 2: 1-(4-methoxyphenyl)ethanone in tetrahydrofuran T=5°C; 144 h; optical yield given as percent eeenantioselective reaction;