in trifluoroacetic acid Kinetics; under Ar; Fe-Co complex treated with CF3CO2H; satd. aq. NaHCO3 soln. added; subjected to solid state extn. (RP-18 LiChrolut), washed with H2O, eluted with MeCN; diluted with H2O; column chromd. (LiChrospher 100 RP-18, MeCN-H2O gradient) at 25°C;