2. Below is the structure of caffeine. Circle and label (a) an amide functional group, (b) a tertiary amine, and (c) the purine ring system. O CH3 CHS O CH H

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Chapter21: Organic And Biological Molecules
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Problem 118AE
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2. Below is the structure of caffeine. Circle and label (a) an amide functional group, (b) a tertiary
amine, and (c) the purine ring system.
O
CH3
N
CH-N
O
N
CH3
N
H
3. Caffeine is an alkaloid and has base characteristics. Of the four nitrogens in the structure of
the molecule, which one(s) would give it this property?
sneltro bem
4. Besides caffeine, what else is extracted into the tea? Why can you use the basic salt, Na₂CO3,
sodium carbonate, to remove this material?
5. What criterion is used for the purity of a sample of caffeine?
Transcribed Image Text:2. Below is the structure of caffeine. Circle and label (a) an amide functional group, (b) a tertiary amine, and (c) the purine ring system. O CH3 N CH-N O N CH3 N H 3. Caffeine is an alkaloid and has base characteristics. Of the four nitrogens in the structure of the molecule, which one(s) would give it this property? sneltro bem 4. Besides caffeine, what else is extracted into the tea? Why can you use the basic salt, Na₂CO3, sodium carbonate, to remove this material? 5. What criterion is used for the purity of a sample of caffeine?
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