• Source: 1,5-Diazabicyclo(4.3.0)non-5-ene

5.180.24.3/info/1,5" target="_blank">1,5-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 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU). The relatively complex nature of the formal names for DBU and DBN (hence the common use of acronyms) reflects the fact that these compounds are bicyclic and contain several functional groups.




Synthesis


DBN could be synthesized in the following manner, similarly to DBU:

The synthetic procedure starts with a Michael addition of 2-pyrrolidone to acrylonitrile, followed by hydrogenation, and finally dehydration.




Uses






= As a base in organic synthesis

=
Similar to many other organic bases, DBN could be employed for dehydrohalogenation reactions, base-catalyzed rearrangement reactions, as well as Aldol condensation. Several examples are shown below:

Elimination:

Epimerization of penicillin derivatives, catalyzed by DBN:

Aldol condensation:




= DBN salt as an ionic liquid

=
The acetate salt of DBN is a room-temperature ionic liquid used for processing cellulose fibers by acting as a replacement for the unstable N-Methylmorpholine N-oxide used for making lyocell.




References

Kata Kunci Pencarian:

• 1,8-Diazabicyclo(5.4.0)undec-7-ene
• 1,5-Diazabicyclo(4.3.0)non-5-ene
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• N,N-Diisopropylethylamine
• Selenidostannate
• DBN
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