HCl or activated silica in tetrahydrofuran THF soln. of excess of Fe complex added to Mn complex, then stirred for16 h at 40°C, filtered, HCl added and stirred for 1 h or mixt. stirred with activated silica;

HCl or activated silica in tetrahydrofuran THF soln. of excess of Fe complex added to Mn complex, then stirred for16 h at 40°C, filtered, HCl added and stirred for 1 h or mixt. stirred with activated silica; evapd., chromd. (hexane/ether), concd., crystd. (ether/pentane, at -80°C); elem. anal.;