in acetonitrile (under Ar, Schlenk); Re2O7 suspended in MeCN, acetic anhydride added, stirred for 30 min, Zn-compound in MeCN added dropwise at -10°C, stirred for 30 min; sepd., solvent removed in vacuo, ppt. washed with n-pentane at -20°C;

in acetonitrile (under Ar, Schlenk); Re2O7 suspended in MeCN, trifluoroacetic anhydride added, stirred for 30 min, Zn-compound in MeCN added dropwise at -10°C, stirred for 30 min; sepd., solvent removed in vacuo, ppt. washed with n-pentane at -20°C;

in not given byproducts: AgCl; (under Ar, Schlenk); AgReO4 reacted with acetyl chloride, filtered, treated with Zn-compound;

in acetonitrile T=20 - 25°C; 0.5 h; Product distribution / selectivity;