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Other Names:


General Information:


CAS Number: 78-67-1

Molecular Weight: 164.21 g/mol

Appearance: White crystals

Melting Point: 103-104 C

Azobisisobutyronitrile (AIBN) is a common reagent for the initiation of radical reactions. AIBN decomposes at temperatures above 60 C to form isobutyronitrile radicals, which function to initiate radical chemistry. Another very common radical intiator is benzoyl peroxide.

Common Uses:

Radical initiator in benzylic brominations


AIBN presents an explosion risk.


1) Patent Reference: WO2016014463, page 101, (6.7 MB)

2) Pearson, A. J.; Roush, W. R.; Handbook of Reagents for Organic Synthesis; Activating Agents and Protecting Groups

3) Wikipedia: Azobisisobutyronitrile (link)

4) 2,2'-Azobis(2-methylpropionitrile) (link)