in neat (no solvent) heated in Pt crucible in a helium flow (150 ml/min) at a rate of 10 K/min to 450°C; washed (H2O); dried; monitored by IR spectroscopy;

in neat (no solvent) heated in Pt crucible in a helium flow (150 ml/min) at a rate of 10 K/min to 450°C; washed (H2O); dried; monitored by IR spectroscopy;