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Treatment of the alkynes R‘C⋮CH (R‘ = Me, n -Pr) with dialkylgallium hydrides, R 2 GaH (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.
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Uhl et al. (2002) studied this question.
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