Organic Chemistry - Standalone book
10th Edition
ISBN: 9780073511214
Author: Francis A Carey Dr., Robert M. Giuliano
Publisher: McGraw-Hill Education
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Chapter 6.3, Problem 5P
Would you expect the
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H₂C
ཏཱཏི 1 ནི
OH
1. Br2, PBг3
2. H₂O
H3C
OH
Br
The a-bromination of carbonyl compounds by Br2 in acetic acid is limited to aldehydes and ketones because acids, esters, and amides don't enolize to a sufficient extent. Carboxylic acids, however, can
be a-brominated by first converting the carboxylic acid to an acid bromide by treatment with PBr3. Following enolization of the acid bromide, Br2 reacts in an a-substitution reaction. Hydrolysis of the
acid bromide completes the reaction.
Draw curved arrows to show the movement of electrons in this step of the mechanism.
Arrow-pushing Instructions
:0:
H3C
Br
Br
+
:::OH2
Br
H₂O
H3C
Br
за
What would be the product if (S)-2-bromobutane underwent an S№1 reaction with
water in the presence of sodium carbonate (a weak base)?
(R)-2-butanol
(S)-2-butanol
A mixture of (R)- and (S)-2-butanol
Amantadine is effective in preventing infections caused by the influenza A virus and in
treating established illnesses. It is thought to block a late stage in the assembly of the
virus. Amantadine is synthesized by treating 1-bromoadamantane with acetonitrile in
sulfuric acid to give N-adamantylacetamide, which is then converted to amantadine.
CH,C=N
in H,SO,
Br
NHCCH3
NH2
1-Bromoadamantane
Amantadine
(a) Propose a mechanism for the transformation in Step 1.
(b) Describe experimental conditions to bring about Step 2.
Chapter 6 Solutions
Organic Chemistry - Standalone book
Ch. 6.1 - Prob. 1PCh. 6.2 - 1-Bromo-3-chloropropane reacts with one molar...Ch. 6.3 - Prob. 3PCh. 6.3 - The Fischer projection for (+)-2-bromooctane is...Ch. 6.3 - Would you expect the 2-octanol formed by SN2...Ch. 6.3 - Prob. 6PCh. 6.4 - Prob. 7PCh. 6.4 - The first step in the synthesis of the...Ch. 6.6 - Prob. 9PCh. 6.6 - Prob. 10P
Ch. 6.7 - Prob. 11PCh. 6.8 - Prob. 12PCh. 6.9 - Diethyl ether (CH3CH2OCH2CH3) has a dielectric...Ch. 6.9 - Unlike protic solvent which solvate from complexes...Ch. 6.10 - Prob. 15PCh. 6.10 - Prob. 16PCh. 6.10 - The hydrolysis of sulfonate of 2-octanol is...Ch. 6.11 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Both of the following reactions involve...Ch. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Sodium nitrite (NaNO2) reacted with 2-iodooctane...Ch. 6 - Prob. 25PCh. 6 - Prob. 26PCh. 6 - Prob. 27PCh. 6 - The reaction of 2,2-dimethyl-1-propanol with HBr...Ch. 6 - If the temperature is not kept below 25oC during...Ch. 6 - The reaction of cyclopentyl bromide with sodium...Ch. 6 - Prob. 31PCh. 6 - Prob. 32PCh. 6 - Write an equation, clearly showing the...Ch. 6 - Prob. 34PCh. 6 - Based on what we know about nucleophiles and...Ch. 6 - Prob. 36PCh. 6 - Prob. 37PCh. 6 - Prob. 38PCh. 6 - Prob. 39PCh. 6 - Prob. 40PCh. 6 - Prob. 41DSPCh. 6 - Prob. 42DSPCh. 6 - Prob. 43DSPCh. 6 - Prob. 44DSPCh. 6 - Prob. 45DSPCh. 6 - Prob. 46DSP
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- Using your reaction roadmap as a guide, show how to convert 1-butanol and ethanol into racemic 2-ethoxy-1-butanol. You must use 1-butanol and ethanol as the source of all carbon atoms in the ether product. (2) OH (1) i 2-ethoxy-1-butanol (racemic) (c) ethylene oxide a OH (a) (CH3)3 CO K+, THF (d) H₂SO4, H₂O (b) OsO4, H₂O2 OH 1 Suggest reagents and experimental conditions for each step in this synthesis. From the choices provided, suggest appropriate reagents for each step. More than one reagent may be necessary. Use the minimum number of steps possible. Enter your answer as a letter, or a series of letters, in the order necessary to bring about the steps shown. Reagents: Br OH (e) m-chloroperoxybenzoic acid (mCPBA) (f) pyridinium chlorochromate (PCC) + || (9) H₂SO4 (anhydrous) (j) Na, NH3 (1) (h) NaOH (k) NBS, heat (i) PBr3 (N-bromosuccinimide)arrow_forwardCH3 གོན་ནི། ཡོན་ Br₂, H₂C CH₂Br H3C CH3 H₂C CH3 Aldehydes and ketones can be halogenated at their a-position by reaction with Cl₂, Br2, or 12, under acidic conditions. Using Br₂ under acidic conditions, an intermediate enol is formed which adds bromine at the a-position. The reaction stops after the addition of one bromine because the electron-withdrawing halogen decreases the basicity of the carbonyl oxygen, making the protonation less favorable. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions :0: :OH н-он H-OH₂ H₂O H₂C. H3C. CH3 CH3 H3C CH3 H3C CH3 Σαarrow_forwardWhat is the role of phosphoric acid in the synthesis of cyclohexene? it is an antioxidant that prevents free radical side reactions it is a safe, non-toxic solvent it lowers the boiling point of the reaction mixture (a colligative property of adding phosphoric acid to water) it protonates the hydroxyl of cyclohexanol to make it a better leaving grouparrow_forward
- Acid-catalyzed hydrolysis of the following epoxide gives a trans diol. CH3 CH3 CH3 НО, НО, H,SO, + H,O HO HO Only this glycol This glycol is is formed. not formed. Of the two possible trans diols, only one is formed. How do you account for this stereoselectivity?arrow_forwardRank the following alcohols in order of increasing ease of acid-catalyzed dehydration. Provide the structure of the dehydration product (alkene) from each alcohol. OH OH 3 1 a OHarrow_forwardcarbon-carbon double bonds are attacked by electrophiles but not by nucleophiles. An exception to this generalization is the reactivity of a,B-unsaturated aldehydes and ketones toward nucleophiles. Even though an isolated carbon-carbon double bond does not react with 2° amines such as dimethylamine, 3-buten-2-one reacts readily by regioselective addition. Et,NH + CH,=CH-CH,-CH, no reaction Et,NH + CH,=CH-C-CH, - Et,N-CH,-CH,-Č-CH, Diethylamine 3-Buten-2-one (Methyl vinyl ketone) Account for the addition of nucleophiles to the carbon-carbon double bond of an a, B-unsaturated aldehyde or ketone and the regioselectivity of the addition.arrow_forward
- -Hydroxyketones and -hydroxyaldehydes are also oxidized by treatment with periodic acid. It is not the -hydroxyketone or aldehyde, however, that undergoes reaction with periodic acid, but the hydrate formed by addition of water to the carbonyl group of the -hydroxyketone or aldehyde. Write a mechanism for the oxidation of this -hydroxyaldehyde by HIO4.arrow_forwardBr2, H3O+ གོ་ཤི་ན་ཤི་ H3C CH3 CH3 CH3 Aldehydes and ketones can be halogenated at their a-position by reaction with Cl₂, Br2, or 12, under acidic conditions. Using Br2 under acidic conditions, an intermediate enol is formed which adds bromine at the a-position. The reaction stops after the addition of one bromine because the electron-withdrawing halogen decreases the basicity of the carbonyl oxygen, making the protonation less favorable. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions :OH :OH Br-Br H3C H3C. Br Br CH₂ H₂ H3C CH3 H3C CH3 2barrow_forwardIdentify A, B, and C, intermediates in the synthesis of the five-membered ring called an α- methylene-γ-butyrolactone. This heterocyclic ring system is present in some antitumor agents.arrow_forward
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