1: With triethylamine in N,N-dimethyl-formamide; toluene Curtius rearrangement; 3 h; Heating; 2: With potassium hydroxide; glycerol in ethanol; N,N-dimethyl-formamide; toluene 2 h; Heating; Further stages.;

sodium hydroxide

ethanol Erwaermen des Reaktionsgemisches mit wss. NaOH;