1,5-Diazabicyclo(4.3.0)non-5-ene


1,5-Diazabicyclonon-5-ene is a chemical compound with the formula CHN. It is an amidine base used in organic synthesis. A related compound with related functions is DBU |1,8-diazabicycloundec-7-ene. The relatively complex nature of the formal names for DBU and DBN reflects the fact that these compounds are bicyclic and contain several functional groups.
The compounds are employed for dehydrohalogenation reactions as well as base-catalyzed rearrangements.