Chapter 29: Q40. (page 1193)
What alkyl halide is needed to synthesize each amino acid from diethyl acetamidomalonate: (a)Asn; (b)His; (c)Trp?
Short Answer



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Chapter 29: Q40. (page 1193)
What alkyl halide is needed to synthesize each amino acid from diethyl acetamidomalonate: (a)Asn; (b)His; (c)Trp?



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Question:With reference to the following peptide:
(a) Identify the N-terminal and C-terminal amino acids.
(b) Name the peptide using one-letter abbreviations.
(c) Label all the amide bonds in the peptide backbone.

Draw the organic products formed in each reaction.
a.

b.

Draw the structure of leu-enkephalin, a pentapeptide that acts as an analgesic and opiate, and has the following sequence: Tyr–Gly–Gly–Phe–Leu. (The structure of a related peptide, met-enkephalin,
appeared in Section 22.6B.)
L-thyroxine, a thyroid hormone and oral medication used to treat thyroid hormone deficiency, is an amino acid that does not exist in proteins. Draw the zwitterionic form of L-thyroxine.

How many different tripeptides can be formed from three different amino acids?
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