Reactions of ytterbium and magnesium gallylene complexes with carbon dioxide and diphenylketene

Reactivity of ytterbium and magnesium complexes of gallylenes against carbon dioxide and diphenylketene has been assessed. Ytterbium complex of redox-active gallylene [{(dpp-bian)Ga}₂Yb(DME)₂] (dpp-bian = 1,2-bis[(2,6-diiso-propylphenyl)imino]acenaphthene) on treatment with CO₂ gives complex [(dpp-bian)Ga(DME)Me], while the treatment of magnesium-stabilized gallylene[{(dpp-bian)Ga}₂Mg(DME)₂] with Ph₂CCO affords cycloadduct [(dpp-bian)(Ph₂CCO)GaMe].