1: With potassium hydrogensulfate; [RhCl(η2:η2-cycloocta-1,5-diene)]2; cyclooctadiene in butanone Heating; 2: With sodium periodate; tetrabutylammomium bromide in butanone T=20°C; 3: With tetrabutylammonium (meta)periodate in butanone T=20°C;