Concept explainers
Interpretation:
The synthesis for gabapentin has to be proposed.
Concept introduction:
Aldol reaction is an addition reaction of
When two molecules of an ester undergo condensation, then it is called claisen condensation. Like in aldol reaction, in claisen condensation one molecule is a nucleophile and the other molecule is an electrophile.
A claisen condensation reaction is a reversible reaction and occurs in the presence of a strong base.
Esterification reaction:
In an esterification reaction,
Reduction of aldehydes and ketones:
In the reduction of carbonyl compounds, carbonyl compounds act as the oxidising agent and the reducing agent will be the hydrogen gas in presence of a metal.
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Chapter 19 Solutions
OWLv2 with MindTap Reader, 1 term (6 months) Printed Access Card for Brown/Iverson/Anslyn/Foote's Organic Chemistry, 8th Edition
- 8 (Chemical Connections 19C) Once it has been opened, and particularly if it has been left open to the air, a bottle of aspirin may develop a vinegar-like odor. Explain how this might happen.arrow_forwardWith reference to the structures of acetylsalicylic acid (aspirin) and acetaminophen (the active ingredient in Tylenol), explain why acetaminophen tablets can be stored in the medicine cabinet for years, but aspirin tablets slowly decompose over time.arrow_forwardWhat carboxylic acid and amine are needed to synthesize the pain reliever phenacetin? Phenacetin was once a component of the over-the-counter pain reliever APC (aspirin, phenacetin, caffeine), but it is no longer used because of its kidney toxicity.arrow_forward
- Aspirin is the common name for the compound acetylsalicylic acid, widely used as a fever reducer and as a pain killer. Salicylic acid, whose name comes from Salix, the willow family of plants, was derived from willow bark extracts. In folk medicine, willow bark teas were used as headache remedies and other tonics. Nowadays, salicylic acid is administered in the form of aspirin which is less irritating to the stomach than salicylic acid. To prepare aspirin, salicylic acid is reacted with an excess of acetic anhydride. A small amount of a strong acid is used as a catalyst which speeds up the reaction. In this experiment, phosphoric acid will be used as the catalyst. The excess acetic acid will be quenched with the addition of water. The aspirin product is not very soluble in water so the aspirin product will precipitate when water is added. The synthesis reaction of aspirin is shown below: Actic anhydride 5 ml. Acetic acid Salicylic acid 28 Acetylsalicylie acid Procedure 1) Mix salicylic…arrow_forwardWhat is the role of phenolphthalein in the neutralization reaction? Draw the structure of phenolphthalein under acidic and basic conditions.arrow_forwardIn the 1880's, Acetanilide, sold under the name Antifebrin, was widely used as a pain reliever and fever reducer. However, it had many adverse side effects, including cyanosis as a result of methemoglobinemia. The toxic side effects were the result of a small portion of acetanilide being hydrolyzed to aniline. Acetanilide was discontinued and replaced with phenacetin. Later studies show that both acetanilide and phenacetin are metabolized to acetaminophen. This metabolite, which we know as Tylenol, is responsible for the analgesic and antipyretic properties. Part 1: Show a detailed arrow pushing mechanism of the acid catalyzed hydrolysis of acetanilide to aniline Part 2: Propose a synthesis of Acetaminophen from phenol NH NH NH Phenacetin inophen Acetanilide Attach File Browse Local Files Browse Content Collectionarrow_forward
- The analgesic acetaminophen is synthesized by treating 4-aminophenol with one equivalent of acetic anhydride. Draw a structural formula for acetaminophen.arrow_forwardStanozolol is an anabolic steroid that promotes muscle growth. Althoughstanozolol has been used by athletes and body builders, many physicaland psychological problems result from prolonged use and it is bannedin competitive sports. Explain why the pKa of the N—H bond in the pyrazole ring iscomparable to the pKa of the O—H bond, making it considerably moreacidic than amines such as CH3NH2 (pKa = 40).arrow_forwardParoxetine (Paxil) is an antidepressant that is a member of a family of drugs known as Selective Serotonin Reuptake Inhibitors (SSRIS). This family of drugs also includes fluoxetine (Prozac) and sertraline (Zoloft). SSRIS work by inhibiting the reuptake of the neurotransmitter serotonin in the synapses of the central nervous system follow- ing release of serotonin during excitation of individual nerve cells. Between firings, the serotonin is taken back up by a nerve cell in preparation for firing again. Inhibition of reuptake has the effect of increasing the time serotonin molecules remain in the syn- apses following excitation, leading to a therapeutic effect. In one synthesis of parox- etine, the following reagents are used. Draw the structures of synthetic intermediates A and B. F НО SOCI, A B HO Pyridinearrow_forward
- Why is methyl salicylate so easily absorbed through the skin?arrow_forwardAnswer the following questions based on the information provided. (a) Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Revatio) is used to improve the ability to exercise in adults with pulmonary arterial hypertension. One of the key step of Sildenafil synthesis is shown below. OEt O OEt O i) Amine HO CHO ii) H20 washing to remove the HCI residue CI N. i) What's the structure of Amine reagent? Amine structure ii) Why does not carboxyl acid react with amine? iii) Draw the mechanism of the reaction.arrow_forwardThe common precursor of amine hormones is the aromatic amino acidarrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage LearningIntroduction to General, Organic and BiochemistryChemistryISBN:9781285869759Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar TorresPublisher:Cengage Learning