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

[Display omitted] 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} 2 Yb(DME) 2 ] (dpp-bian = 1,2-bis[(2,6-diiso-propylphenyl)imino]acenaphthene) on treatment with CO 2 gives complex [(dpp-bian)Ga(DME)Me], while the treatment of magnesium-stabilized gallylene[{(dpp-bian)Ga} 2 Mg(DME) 2 ] with Ph 2 CCO affords cycloadduct [(dpp-bian)(Ph 2 CCO)GaMe]. [ABSTRACT FROM AUTHOR]