High Quality Content by WIKIPEDIA articles! Azobisisobutyronitrile is a compound often used as a foamer in plastics and rubber and as a radical initiator. It is commonly known as AIBN. Its most common chemical reaction is one of decomposition, eliminating a molecule of nitrogen gas to form two 2-cyanoprop-2-yl radicals. Radicals can be used to initiate free radical polymerizations and other radical reactions. For instance a mixture of styrene and maleic anhydride in toluene will react if heated, forming the polystyrene polymer, only very slowly unless an initiator such an AIBN is present. Another example of a radical reaction that can be initiated by AIBN is the anti-Markovnikov hydrohalogenation of alkenes.

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