Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Chapter 10.SE, Problem 19MP
The formation of Br2 from NBS first involves the reaction of NBS with HBr to form an iminol intermediate and molecular bromine. The intermediate then undergoes acid-catalyzed tautomerism to form succinimide, the byproduct of the reaction. Propose a curved-arrow mechanism for the conversion of NBS into succinimide that also accounts for the formation of Br2.
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CH3
Ph3P-CHCH3
H3C
H3C
Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction. In the reaction, a triphenylphosphorine ylide, also called a phosphorane, adds to
an aldehyde/ketone to give a four-membered cyclic intermediate called an oxaphosphetane. The oxaphosphetane is not isolated but instead spontaneously decomposes to release triphenylphosphine
oxide and an alkene.
Ph3P-CHCH3
H3C
The ylide is formed by reaction of triphenylphosphine, a good nucleophile, with a primary alkyl halide in an S 2 reaction, followed by deprotonation of the carbon with a strong base, such as
butyllithium. The carbonyl carbon and the carbon originally bonded to the halogen become the two carbons with the double bond in the product alkene
:0:
CH3
Com
The real value of the Wittig reaction lies in its ability to yield an alkene of predictable structure, as the C-C bond is precisely where the C=O bond was in the reactant and no isomers (other than…
Which of the following statements is correct?
A) The haloform reaction proceeds under very difficult conditions and the yield is very low.
B) The haloform reaction is used only for the identification of compounds containing secondary alcohol groups.
C) Methyl ketones or alcohols are oxidized with halogens in acidic solutions to give carboxylic acids and the appropriate haloform product.
D) Enolate anions react rapidly with halogens to give alpha-halocarbonyl compounds.
Ph3P-CHCH3
H₂C
H3C
Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction. In the reaction, a triphenylphosphorine ylide, also called a phosphorane, adds to
an aldehyde/ketone to give a four-membered cyclic intermediate called an oxaphosphetane. The oxaphosphetane is not isolated but instead spontaneously decomposes to release triphenylphosphine
oxide and an alkene.
CH3
00
+
The ylide is formed by reaction of triphenylphosphine, a good nucleophile, with a primary alkyl halide in an SN2 reaction, followed by deprotonation of the carbon with a strong base, such as
butyllithium. The carbonyl carbon and the carbon originally bonded to the halogen become the two carbons with the double bond in the product alkene
X m
CH3
The real value of the Wittig reaction lies in its ability to yield an alkene of predictable structure, as the C=C bond is precisely where the C=O bond was in the reactant and no isomers (other than E/Z
isomers)…
Chapter 10 Solutions
Organic Chemistry
Ch. 10.1 - Prob. 1PCh. 10.1 - Draw structures corresponding to the following...Ch. 10.2 - Prob. 3PCh. 10.2 - Taking the relative reactivities of 1°, 2°, and...Ch. 10.4 - Prob. 5PCh. 10.4 - The major product of the reaction of...Ch. 10.4 - Prob. 7PCh. 10.5 - Prob. 8PCh. 10.6 - Prob. 9PCh. 10.6 - How might you replace a halogen substituent by a...
Ch. 10.7 - How would you carry out the following...Ch. 10.8 - Rank both sets of compounds in order of increasing...Ch. 10.8 - Tell whether each of the following reactions is an...Ch. 10.SE - Prob. 14VCCh. 10.SE - Prob. 15VCCh. 10.SE - Prob. 16VCCh. 10.SE - Draw the electron-pushing mechanism for each...Ch. 10.SE - Draw the electron-pushing mechanism for the...Ch. 10.SE - The formation of Br2 from NBS first involves the...Ch. 10.SE - In light of the fact that tertiary alkyl halides...Ch. 10.SE - Alkyl halides can be reduced to alkanes by a...Ch. 10.SE - Name the following alkyl halides:Ch. 10.SE - Prob. 23APCh. 10.SE - Draw and name all of the monochlorination products...Ch. 10.SE - How would you prepare the following compounds,...Ch. 10.SE - Prob. 26APCh. 10.SE - A chemist requires a large amount of...Ch. 10.SE - What product(s) would you expect from the reaction...Ch. 10.SE - What product(s) would you expect from the reaction...Ch. 10.SE - What product would you expect from the reaction of...Ch. 10.SE - Rank the compounds in each of the following series...Ch. 10.SE - Which of the following compounds have the same...Ch. 10.SE - Tell whether each of the following reactions is an...Ch. 10.SE - Prob. 34APCh. 10.SE - Alkylbenzenes such as toluene (methylbenzene)...Ch. 10.SE - Prob. 36APCh. 10.SE - Prob. 37APCh. 10.SE - Prob. 38APCh. 10.SE - Prob. 39APCh. 10.SE - Prob. 40APCh. 10.SE - The syntheses shown here are unlikely to occur as...Ch. 10.SE - Why do you suppose its not possible to prepare a...Ch. 10.SE - Prob. 43APCh. 10.SE - Identify the reagents a–c in the following...Ch. 10.SE - Prob. 45APCh. 10.SE - Prob. 46APCh. 10.SE - Prob. 47APCh. 10.SE - The relative rate of radical bromination is...Ch. 10.SE - Prob. 49APCh. 10.SE - Predict the product and provide the entire...
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