Gamma-Butyrolactone → 1,5-Diazabicyclo(4.3.0)non-5-ene

Participants

Reaction Steps

Using a method similar to Example 1, 25.4 mol of butyrolactone were reacted with 35 mol of 1,3-DAP (molar ratio=1.38). After a reaction time of 32 hours, the temperature of the liquid in the flask was 220° C. and 73% of the theoretically possible amount of water had been distilled off. Distillation gave 12 mol of DBN having a purity of more than 99.1%. The total yield of DBN, including the amount still present in the distillation residues, was 83.3%.

Provenance & Evidence