Following is a structural formula for imidazole, a
Chapter 4, Problem 4.54(choose chapter or problem)
Following is a structural formula for imidazole, a building block of the essential amino acid histidine (Chapter 27). It is also a building block of histamine, a compound all too familiar to persons with allergies and takers of antihistamines. When imidazole is dissolved in water, proton transfer to it gives a cation. Is this cation better represented by structure A or B? Explain. N H Imidazole N N HH A N H2O OH or N H B N H 54
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