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note
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With regard to entries 6 and 7, the tautmeric isomers should be taken into account. On the basis of the electron density, the ethoxycarbonyldifluoromethylated positions will be the 3- and 4-position of the isomers of 4-methylpyrazole and 4-phenylimidazole, respectively. These positions correspond to the 2-position of 4-methylpyrazole and 4-phenylimidazole. Thus, it can be concluded that the same discussion on the electrophilic substitution is applied to the tautmeric isomers.
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79952195806
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note
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19F NMR. These peaks may be assigned to the products, which the each phenyl ring was ethoxycarbonyldifluoromethylated. Since the formed amounts of these products were very small, they were not characterized.
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