Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
thumb_up100%
Chapter 26.SE, Problem 49AP
Leuprolide is a synthetic nonapeptide used to treat both endometriosis in women and prostate cancer in men.
(a) Both C-terminal and N-terminal amino acids in leuprolide have been structurally modified. Identify the modifications.
(b) One of the nine amino acids in leuprolide has d stereochemistry rather than the usual L. Which one?
(c) Write the structure of leuprolide using both one- and three-letter abbreviations.
(d) What charge would you expect leuprolide to have at neutral pH?
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
A naturally occurring amino acid such as alanine has a group that is a carboxylic acid and a group that is a protonated amine. The pKa values of the two groups are shown.(a). If the pKa value of a carboxylic acid such as acetic acid is about 5, then why is the pKa value of the carboxylic acid group of alanine so much lower? (b). Draw the structure of alanine in a solution at pH = 0.
(c). Draw the structure of alanine in a solution at physiological pH (pH 7.4).(d). Draw the structure of alanine in a solution at pH = 12.
(e). Is there a pH at which alanine is uncharged (that is, neither group has a charge)?
(f) At what pH does alanine have no net charge (that is, the amount of negative charge is the same as the amount of positive charge)?
(a) The two most acidic hydrogens of uracil have pKa’s of 9.5 and 14.2, respectively. Match these pKa’s with the hydrogens in the structural formula and provide structures for the most stable resonance contributors of the monoanion and the dianion.(b) The pKa of the conjugate acid of triethylamine is 10.4. Is triethylamine a strong enough base to convert uracil to its monoanion? To its dianion?
Draw both enantiomers of each amino acid and label them as R or S: (a) phenylalanine; (b) methionine.
Chapter 26 Solutions
Organic Chemistry
Ch. 26.1 - How many of the -amino acids shown in Table 26-1...Ch. 26.1 - Prob. 2PCh. 26.1 - Prob. 3PCh. 26.2 - Hemoglobin has pI=6.8. Does hemoglobin have a net...Ch. 26.3 - Show how you could prepare the following -amino...Ch. 26.3 - What alkyl halides would you use to prepare the...Ch. 26.3 - Prob. 7PCh. 26.4 - There are six isomeric tripeptides that contain...Ch. 26.4 - Draw the structure of M-P-V-G, and indicate its...Ch. 26.5 - Prob. 10P
Ch. 26.5 - Prob. 11PCh. 26.6 - The octapeptide angiotensin II has the sequence...Ch. 26.6 - Prob. 13PCh. 26.6 - Prob. 14PCh. 26.6 - Give the amino acid sequence of hexapeptides that...Ch. 26.7 - Prob. 16PCh. 26.7 - Write all five steps required for the synthesis of...Ch. 26.10 - Prob. 18PCh. 26.SE - Identify the following amino acids:Ch. 26.SE - Prob. 20VCCh. 26.SE - Isoleucine and threonine are the only two amino...Ch. 26.SE - Prob. 22VCCh. 26.SE - Give the sequence of the following tetrapeptide:Ch. 26.SE - Prob. 24MPCh. 26.SE - The chloromethylated polystyrene resin used for...Ch. 26.SE - Prob. 26MPCh. 26.SE - Prob. 27MPCh. 26.SE - Prob. 28MPCh. 26.SE - Except for cysteine, only S amino acids occur in...Ch. 26.SE - Prob. 30APCh. 26.SE - Prob. 31APCh. 26.SE - Show the structures of the following amino acids...Ch. 26.SE - Prob. 33APCh. 26.SE - Using both three- and one-letter codes for amino...Ch. 26.SE - Prob. 35APCh. 26.SE - Show how you could use the acetamidomalonate...Ch. 26.SE - Prob. 37APCh. 26.SE - Show how you could prepare the following amino...Ch. 26.SE - Prob. 39APCh. 26.SE - Predict the product of the reaction of valine with...Ch. 26.SE - Prob. 41APCh. 26.SE - Prob. 42APCh. 26.SE - Propose two structures for a tripeptide that gives...Ch. 26.SE - Show the steps involved in a synthesis of...Ch. 26.SE - Prob. 45APCh. 26.SE - Prob. 46APCh. 26.SE - Prob. 47APCh. 26.SE - Which of the following amino acids are more likely...Ch. 26.SE - Leuprolide is a synthetic nonapeptide used to...Ch. 26.SE - The -helical parts of myoglobin and other proteins...Ch. 26.SE - Prob. 51APCh. 26.SE - Cytochrome c is an enzyme found in the cells of...Ch. 26.SE - Prob. 53APCh. 26.SE - Prob. 54APCh. 26.SE - Prob. 55APCh. 26.SE - What is the structure of a nonapeptide that gives...Ch. 26.SE - Oxytocin, a nonapeptide hormone secreted by the...Ch. 26.SE - Aspartame, a nonnutritive sweetener marketed under...Ch. 26.SE - Prob. 59APCh. 26.SE - Prob. 60APCh. 26.SE - Prob. 61APCh. 26.SE - Prob. 62AP
Additional Science Textbook Solutions
Find more solutions based on key concepts
Give the IUPAC name for each compound.
Organic Chemistry
Label each statement about the polynucleotide ATGGCG as true or false. The polynucleotide has six nucleotides. ...
General, Organic, & Biological Chemistry
Determine [OH], [H+], and the pH of each of the following solutions. a. 1.0 M KCl b. 1.0 M KC2H3O2
Chemistry
2. Why shouldn’t you work in a laboratory by yourself?
The Organic Chem Lab Survival Manual: A Student's Guide to Techniques
16.43 The following pictures represent solutions at various stages in thetitration of a weak diprotic acid with...
Chemistry (7th Edition)
45. Calculate the mass of nitrogen dissolved at room temperature in an 80.0-L home aquarium. Assume a total pre...
Chemistry: Structure and Properties
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- (ii) Describe the key molecular structure features of the pharmacologically active 2- oxazolidinone group of antibacterial agents.arrow_forwardGive reasons :(a) Aniline is a weaker base than cyclohexyl amine.(b) It is difficult to prepare pure amines by ammonolysis of alkyl halides.arrow_forward2. a) Draw the following: (a) nonanamide (b) N-methyloctanamide (c) (d) N-ethyl-N-propylpropanamide N-ethyl-2,4,6-trimethyldecanamidearrow_forward
- There are a number of pharmacokinetic strategies available to change the absorption of a lead compound during the drug design process. (a) Based on the lead compound shown, draw an analogue which has decreased polarity using two different strategies. The drawing can be done neatly by hand or by using ChemDraw. (b) Clearly label your analogue with the strategy being used for each change. (c) State whether your analogue will be more hydrophillic or hydrophobic than the original lead compound shown. (d) Attach a clear photo of your handwritten structure and answers using an image file or upload a PDF, Powerpoint or Word file containing your ChemDraw structure and answers. SO,Me N. CH3arrow_forwardSeveral compounds have been found to inhibit -lactamase, and drugs based on these compounds can be taken in combination with penicillins and cephalosporins to restore their effectiveness when resistance is known to be a problem. The commonly prescribed formulation called Augmentin is a combination of the -lactamase inhibitor shown below with amoxicillin (shown above). It is used to treat childhood ear infections when resistance is suspected, and many kids know it as the white liquid that tastes like bananas. Which of the statements below are true statements? 1. The stereochemistry of the fusion between the four-and five-membered rings in the inhibitor and amoxicillin are different. 2. The inhibitor possesses enol ether and allylic alcohol functional groups while the antibiotic possesses a phenol and a secondary amide functional group. 3. Neither the inhibitor nor the antibiotic contains strained rings. 4. Both 1 and 2 are true.arrow_forward(1) what reagent is used to convert p-amino phenol to quinone (2) Draw two different kekule's structures for pyrene and under line the more stablearrow_forward
- For each amino acid listed, tell whether its influence on tertiary structure is largely through hydrophobic interactions,hydrogen bonding, formation of salt bridges, covalent bonding, or some combination of these effects.(a) Tyrosine (b) Cysteine(c) Asparagine (d) Lysine(e) Tryptophan (f) Alanine(g) Leucine (h) Methioninearrow_forward(i) Why do actinoids show wide range of oxidation states? (ii) Why is actinoid contraction greater than lanthanoid contraction?arrow_forward3a. 3b. 3c 3d. 3e. CO₂ clavulanic acid CH₂-OH H Answer the following questions about clavulanic acid. Does clavulanic acid inhibit D-alanyl-D-alanine transpeptidase? Does clavulanic acid contain a ß-lactam? Does clavulanic acid contain a thiazolium ring? What is the result of the treatment of penicillinase with clavulanic acid? Does clavulanic acid form a covalent acyl-enzyme intermediate with penicillinase?arrow_forward
- Provide the correct structure from the IUPAC name. (a) 2-aminocyclopropanecarboxylic acid (b) 3-mercapto-5-oxoheptanal (c) Propyl 2,2,4-trimethyloct-4-enoate (d) 4-oxocycloheptanecarbaldehyde (e) N,N,4,4-tetraethylhexanamide (f) Acetic pentanoic anhydride (g) Acetyl chloride (h) Methyl 3,3-diethyl-6-octynoatearrow_forwardGlutathione (GSH) is a tripeptide that serves as a mild reducing agent to detoxify peroxides and maintain the cysteineresidues of hemoglobin and other red blood cell proteins in the reduced state. Complete hydrolysis of glutathione givesGly, Glu, and Cys. Treatment of glutathione with carboxypeptidase gives glycine as the first free amino acid released.Treatment of glutathione with 2,4-dinitrofluorobenzene (Sanger reagent, Problem 24-21, page 1246), followed bycomplete hydrolysis, gives the 2,4-dinitrophenyl derivative of glutamic acid. Treatment of glutathione with phenylisothiocyanate does not give a recognizable phenylthiohydantoin, however.(a) Propose a structure for glutathione consistent with this information. Why would glutathione fail to give a normalproduct from Edman degradation, even though it gives a normal product from the Sanger reagent followed byhydrolysis?(b) Oxidation of glutathione forms glutathione disulfide (GSSG). Propose a structure for glutathione disulfide, and…arrow_forwardDraw a structural formula for each amine and amine derivative. (a) N,N-Dimethylaniline (b) Triethylamine (c) tert-Butylamine (d) 1,4-Benzenediamine (e) 4-Aminobutanoic acid (f) (R)-2-Butanamine (g) Benzylamine (h) trans-2-Aminocyclohexanol (i) 1-Phenyl-2-propanamine (amphetamine) (j) Lithium diisopropylamide (LDA) (k) Benzyltrimethylammonium hydroxide (Triton B)arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning
Organic Chemistry
Chemistry
ISBN:9781305580350
Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher:Cengage Learning
Biomolecules - Protein - Amino acids; Author: Tutorials Point (India) Ltd.;https://www.youtube.com/watch?v=ySNVPDHJ0ek;License: Standard YouTube License, CC-BY