15-Diazabicyclo(4.3.0)non-5-ene Tags: Chemical Compound, Chemical Substance.15-Diazabicyclo[4.3.0]non-5-ene (DBN) is a chemical compound with the formula C7H12N2. It is an amidine base used in organic synthesis. A related compound with related functions is 18-diazabicyclo[5.4.0]undec-7-ene (DBU). thumbnail IUPAC name 234678-hexahydropyrrolo[12-a]pyrimidine Learn more... Loading...