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The first monoarene complexes of gallium(I) were obtained by reaction of Ga2X4 (X = Cl, Br), suspended in toluene, with hexamethylbenzene. In 1b, C-1 and C-4 of the arena ligand are shifted towards the GaI; 1b can thus be regarded both as a π-complex as well as nido-cluster.
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Schmidbaur et al. (1984) studied this question.
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