Lithium tetraalkylalanates

The lithium tetraalkylalanates obtained in situ firom these reactions are easily involved in the subsequent transformations. Cross-coupling of lithium tetraalkylalanates with allyl halides in the presence of copper compounds (CuBr, Cul, CuCN, CuCl, Cu(OAc)2) furnishes olefins that differ firom the initial ones by three carbon atoms [23], and CuCl-catalyzed reaction with propargyl bromide produces terminal allenes in high yields [24]. Such cross-couplings were also performed with allene bromide [25], carboxylic acid halides [26], acrolein [27], and methyl vinyl ketone... 

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