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Vinamidine Boron Chelate Compounds The chelate compound 7 is obtained by the reaction of the vinamidine 6 with Et2O ‐ BF3. Protonation with HBF4 gives the cation 11. Comparison of the calculated and experimentally determined structures demonstrates 7 and 11 to be heterocyclic analogues of the cyclohexadienide 5 and 1,4‐cy‐cyclohexadiene (12).
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Kühn et al. (1990) studied this question.
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