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Reference.org
Methylaluminoxane
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<p>Methylaluminoxane, commonly called MAO, is a mixture of <a href="/facts/Organoaluminium_compound/GM0K5eKE">organoaluminium compounds</a> with the approximate formula (Al(CH3)O)<i>n</i>. It is usually encountered as a solution in (<a href="/facts/Aromatic/wK0DzRY6">aromatic</a>) <a href="/facts/Solvent/LoMPMz8S">solvents</a>, commonly <a href="/facts/Toluene/Pzdt8dwD">toluene</a> but also <a href="/facts/Xylene/BEGggD9s">xylene</a>, <a href="/facts/Cumene/uNbTBzE3">cumene</a>, or <a href="/facts/Mesitylene/4JCRbj1Y">mesitylene</a>, Used in large excess, it activates precatalysts for alkene polymerization. </p>