sodium tetraphenyl borate in tetrahydrofuran Ar-atmosphere; addn. of 1 equiv. of borate to Mn-complex at -78°C, then 23°C, 18 h; not isolated, reaction followed by IR spectroscopy;

in tetrahydrofuran Ar-atmosphere; addn. of 1 equiv. of borate to Mn-complex at -78°C, warming to 0°C over 2 h; not isolated, reaction followed by IR spectroscopy;