Hitherto unknown for main group elements was the structural element M6O13, which has now been found in the cation 1, taci = 1,3,5-triamino-1,3,5-trideoxyinositol. In the In6O13 core with a μ6-oxo center and approximate Oh symmetry, the OIn6 unit is completely shielded by the six-coordinate (taci–3 H) ligands, which explains the surprising stability of 1 toward further hydrolysis.
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Hegetschweiler et al. (1993) studied this question.
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