ORGANIC CHEMISTRY W/BIOLOGICAL TOPICS
6th Edition
ISBN: 9781260325294
Author: SMITH
Publisher: RENT MCG
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Chapter 27.4, Problem 13P
What
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α-Amino acids can be prepared by treating an aldehyde with ammonia/trace acid, followed by hydrogen cyanide, followed by acid-catalyzed hydrolysis.
What amino acid is formed when the aldehyde that is used is 3-methylbutanal?
α-Amino acids can be prepared by treating an aldehyde with ammonia/trace acid, followed by hydrogen cyanide, followed by acid-catalyzed hydrolysis.
Draw the structures of the two intermediates formed in this reaction.
(a) What amino acids would be obtained by hydrolysis of
the following tripeptide?
H,NCHCNHCHCNHCHCOH
(CH)2CH H.CоН Н-ССH-СОН
(b) How many different tripeptides can be made from gly-
cine, serine, and glutamic acid? Give the abbreviation for
each of these tripeptides, using the three-letter codes and
one-letter codes for the amino acids.
Chapter 27 Solutions
ORGANIC CHEMISTRY W/BIOLOGICAL TOPICS
Ch. 27.1 - Prob. 1PCh. 27.1 - Problem 29.2
What form exists at the isoelectric...Ch. 27.1 - Problem 29.3
Explain why the of the group of an...Ch. 27.1 - Prob. 4PCh. 27.2 - Problem 29.5
What -halo carbonyl compound is...Ch. 27.2 - Problem 29.6
The enolate derived from diethyl...Ch. 27.2 - Problem 29.7
What amino acid is formed when is...Ch. 27.2 - Problem 29.8
What aldehyde is needed to synthesize...Ch. 27.2 - Problem 29.9
Draw the products of each...Ch. 27.3 - Prob. 10P
Ch. 27.3 - Prob. 11PCh. 27.3 - Prob. 12PCh. 27.4 - Problem 29.13
What alkene is needed to synthesize...Ch. 27.5 - Problem 29.14
Draw the structure of each peptide....Ch. 27.5 - Problem 29.15
Name each peptide using both the...Ch. 27 - Draw the product formed when the following amino...Ch. 27 - With reference to the following peptide: a...Ch. 27 - Prob. 31PCh. 27 - Histidine is classified as a basic amino acid...Ch. 27 - Tryptophan is not classified as a basic amino acid...Ch. 27 - What is the structure of each amino acid at its...Ch. 27 - What is the predominant form of each of the...Ch. 27 - 29.37 What is the predominant form of each of the...Ch. 27 - a. Draw the structure of the tripeptide A–A–A, and...Ch. 27 - 29.39 Draw the organic products formed in each...Ch. 27 - 29.40 What alkyl halide is needed to synthesize...Ch. 27 - Prob. 50PCh. 27 - Draw the structure for each peptide: (a) Phe–Ala;...Ch. 27 - 29.52 For the tetrapeptide Asp–Arg–Val–Tyr:
a....Ch. 27 - Prob. 53PCh. 27 - Prob. 54PCh. 27 - 29.55 Draw the amino acids and peptide fragments...Ch. 27 - Prob. 56PCh. 27 - Prob. 57PCh. 27 - Prob. 58PCh. 27 - 29.59 An octapeptide contains the following amino...Ch. 27 - 29.60 Draw the organic products formed in each...Ch. 27 - 29.65 Draw the mechanism for the reaction that...Ch. 27 - 29.66 Which of the following amino acids are...Ch. 27 - 29.67 After the peptide chain of collagen has been...Ch. 27 - Prob. 68PCh. 27 - Prob. 69PCh. 27 - 29.70 The anti-obesity drug orlistat works by...Ch. 27 - Prob. 71P
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- Proteins are polyamides formed from a-amino acids. Draw a partial structure of a protein by drawing three monomeric units of it.arrow_forwardGlutamic acid has three ionizable groups. The pKa of α-COOH is 2.19; a-NH 3+, 9.67; and the R-group, 4.25. What is the charge of glutamic acid at pH 10.00?arrow_forwardAll amino acids share a common structure, a central (alpha) carbon with four groups attached. Which of these is NOT one of the four groups attached to the alpha- carbon? O an R group an ammonium group (-NH3+) O a carboxylate group (-COO) a hydronium grouparrow_forward
- You are given the structures of the amino acids alanine (Ala), methionine (Met) and threonine (Thr). to H2N CO2H H2N CO2H H2N co,Harrow_forwardGive the amino acid sequence of a hexapeptide that contains the amino acids Ala, Val, Ser, Ile, Gly, Tyr, and forms the following fragments when partially hydrolyzed with HCl: Gly–Ile–Val, Ala–Ser–Gly, and Tyr–Ala.arrow_forward(a) Which of the common amino acids have more than one carboxyl group?arrow_forward
- 2. Classify the following amino acids as nonpolar, polar basic, polar acidic, or polar neutral. (a) (b) (c) (d) H₂N-CH-COH CH-OH I CH3 || H₂N-CH-C-OH I CH₂ C=O 1 OH H₂N-CH-C-OH CH₂ T CH-CH3 CH₂ H₂N-CH-C-OH ī CH₂ OH 229arrow_forward← + 5 2 QT ΑΙ 1. SECTION A Answer BOTH questions in this section (Each question is worth 20 marks) Answer ALL parts of this question. (a) Compare the structure of the ß-lactam antibiotic A with antibiotic X shown in Figure Q1(a) in terms of how structural differences affect the following properties; (i) Spectrum of activity. (ii) Resistance to ẞ-Lactamases. (iii) Oral bioavailability. (3 marks) (3 marks) (3 marks) (b) HH H H ΗΝ Ξ S ΗΝ Ξ S CO₂H A CO₂H X Figure Q1(a) The drugs that are available for Highly Active Antiretroviral Therapy (HAART) can be broken down into five classes. Define three of these classes providing one drug example for each. (6 marks) Question 1 continued on page 2....arrow_forward8.) Which of these a-amino acids is described by the IUPAC name 2-amino-3-(4-hydroxyphenyl)propanoic acid? (Hint: draw it.) D) glutamine A) alanine B) phenylalanine C) proline E) tyrosine F) tryptophan G) threoninearrow_forward
- Threonine, an amino acid, has four stereoisomers. The stereoisomer found in nature is (2S,3R)-threonine. Which of the following structures represents the naturally occurring amino acid?arrow_forwardAmino acids exist as dipolar ions or zwitterions in which the amino group exists as a negatively-charged ammonium group and the carboxyl group as a positively-charged carboxylate group. O True Falsearrow_forwardLanthionine is a nonstandard amino acid consisting of two alanine residues linked via their β carbon atoms by a thioether (—S—) linkage. Draw the structure of lanthionine.arrow_forward
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