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Other than those reports, there have been several papers in which oxocarbenium ions are written in schemes or figures of acetal substitution reactions. In all such cases, however, no definitive evidence of existence of the oxocarbenium ions is shown to the best of our knowledge. Moreover, it is not clear that such oxocarbenium ions are the contact ion pair or the solvated or dissociated ion pair.
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Other than those reports, there have been several papers in which oxocarbenium ions are written in schemes or figures of acetal substitution reactions. In all such cases, however, no definitive evidence of existence of the oxocarbenium ions is shown to the best of our knowledge. Moreover, it is not clear that such oxocarbenium ions are the contact ion pair or the solvated or dissociated ion pair.
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N2) on the mechanism of the reactions using a chiral Nb catalyst, because the reactions of 1 or 9 with 7 did not proceed in the presence of the Nb catalyst.
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N2) on the mechanism of the reactions using a chiral Nb catalyst, because the reactions of 1 or 9 with 7 did not proceed in the presence of the Nb catalyst.
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