Deprotonation of the conjugate acid 2 led to the first gallatabenzene 1. The acidity of 2 and the low-field shift of the NMR signals of the ring protons of 1 relative to the corresponding properties of cyclohexadienide suggest that 1 has aromatic character. The heterocycle of 1 can function as a ligand and was coordinated to a Mn(CO)3 fragment.
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Ashe et al. (1995) studied this question.
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