acetonitrile 300 g of a clear 17 0 solution of libob in propylene carbonate were covered with a layer of 560 g of toluene whilst stirring towards the end of the toluene addition a colourless solid began to crystallise out in the lower liquid phase the stirrer was switched off and the upper toluene rich phase was decanted off 550 g with a li content of 0 057 mmol g then the stirrer was switched on again and 340 g of fresh toluene were added much more crystallisate formed during this process and the heavier liquid phase disappeared the solution was cooled to 0 u00b0 c and held at this temperature for two hours then the cold mixture was filtered the crystallisate was washed twice with 50 ml of toluene each time and then vacuum dried at room temperature for 5 hours 40 2 g of a colourless crystallisate with a lithium and boron content of 4 2 mmol g were obtained this value corresponds to a libob content of 81 i e a libob 0 43 pc complex the libob solvate dissolved completely and without residue in acetonitrile and had a dust content of less than 1 wt 11 2 kg of a 17 0 solution of libob in pc having a water content of 470 ppm karl fischer titration were stirred with 538 g of aluminium oxide alu n from icn biomedicals for 5 hours after this time a sample was.