| 21. | This compound is a protonated morpholine molecules.
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| 22. | Some studies of the C NMR in particular favored interpretation via the protonated nortricyclene structure.
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| 23. | Both the protonated and neutral forms lessen the membrane permeability of the nerve to sodium.
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| 24. | In an acid environment, the inactive drug is protonated and rearranges into its active form.
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| 25. | The negatively charged glucose-bound oxygen is then protonated by His119 forming a free glucose.
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| 26. | Protonated bipyridine adopts a cis conformation.
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| 27. | To close the fructose ring, the reverse of ring opening occurs and the ketose is protonated.
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| 28. | The hydroxyl is protonated using hydrogen from formic acid, which allows for water molecule to leave.
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| 29. | Thus the mechanism was proposed to occur via attack of the protonated carbonyl with the forming enol.
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| 30. | Under strongly acid conditions periodic acid can be protonated to give the " orthoperiodonium " cation.
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