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The unusual oxidation state i and M4tetrahedral in the solid-state characterize tris(tri-methylsilyl)methylgallium, the disproportionation product of the reaction of Ga2Br4 · 2dioxane with solvent-free LiC-(SiMe3)3. Although only the monomeric unit is detected by mass spectrometry, tetramers (X-ray structure shown here) are found in the solid state.
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Uhl et al. (1992) studied this question.
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