Hydrogallation of Alkynes: Syntheses of Carbon−Gallium Cages Possessing Heteroadamantane Structures

Abstract

Treatment of the alkynes R‘C⋮CH (R‘ = Me, n-Pr) with dialkylgallium hydrides, R2GaH (R = Me, Et), yielded symmetrical carbon−gallium cage compounds with release of dihydrogen and subsequent addition of Ga−H to the C⋮C triple bonds. Heteroadamantane-type compounds (GaR)6(CR‘)4 were formed in which the positions of the methylene bridges of the carbon skeleton in adamantane were occupied by coordinatively unsaturated, tricoordinate gallium atoms.