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Cryochemically prepared AlBr and AlBr3 react in anisole to form donor‐stabilized AlBr2, which precipitates in the form of yellow needles with the composition Al2Br4 · 2 anisole. In the solid state the compound is stable at room temperature with regard to disproportionation into Al and Al‴ species. The Al‐Al distance in the adduct (252.7pm) is roughly as short as that in the radical anion [Al2R4].− (RCH(SiMe3)2), which contains an ALAL a bond (253 pm) strengthened by π bond contributions.
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Mocker et al. (1994) studied this question.
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