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 17, Problem 29P
Interpretation Introduction
Interpretation:
Theterminology intramolecular Williamson reaction is to be explained by writing the structure of the product for the given reaction.
Concept introduction:
The Williamson reaction is the synthesis of ether by nucleophilic substitution usingalkoxide ion.
In case of intramolecular Williamson reaction, the attacking and leaving groups are part of a single molecule and form cyclic ether.
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Explain this observation: Ethyl 3-phenylpropanoate (C6H5CH2CH2CO2CH2CH3) reacts with electrophiles to afford ortho- and para-disubstituted arenes, but ethyl 3-phenylprop-2-enoate (C6H5CH=CHCO2CH2CH3) reacts with electrophiles to afford meta- disubstituted arenes.
We have seen that the alpha carbon atom of an enamine can function as a nucleophile in a Michael reaction, and in fact,
enamines can function as nucleophiles in a wide variety of reactions. For example, an enamine will undergo alkylation
when treated with an alkyl halide. Draw the structure of intermediate A and the alkylation product B in the following
reaction scheme (J. Am. Chem. Soc. 1954, 76, 2029-2030):
TSOH
-H₂O
NH
A
1) CHgI
2) H₂O+
B +
NH
Modify the given copy of the starting material to draw compound A. If needed, use the single bond tool to interconvert
between double and single bonds.
Edit Drawing
The Stork reaction is a condensation reaction between an enamine donor and an α,β-unsaturated carbonyl acceptor. The overall reaction consists of a three-step sequence of
formation of an enamine from a ketone,
Michael addition to an α,β-unsaturated carbonyl compound, and
hydrolysis of the enamine in dilute acid to regenerate the ketone.
Consider the Stork reaction between cyclohexanone and propenal
Draw the structure of the product of the enamine formed between cyclohexanone and dimethylamine.
- Michael addition to an α,β-unsaturated carbonyl compound, and
- hydrolysis of the enamine in dilute acid to regenerate the ketone.
Chapter 17 Solutions
Organic Chemistry - Standalone book
Ch. 17.1 - Prob. 1PCh. 17.2 - The heats of combustion of 1, 2-epoxybutane...Ch. 17.3 - Prob. 3PCh. 17.4 - Prob. 4PCh. 17.5 - Prob. 5PCh. 17.6 - Problem 17.6 (a) Write equations describing two...Ch. 17.6 - Problem 17.7 Only one combination of alkyl halide...Ch. 17.6 - Prob. 8PCh. 17.8 - Prob. 9PCh. 17.8 - Prob. 10P
Ch. 17.9 - Prob. 11PCh. 17.10 - Problem 17.12 Classify the bromohydrins formed...Ch. 17.11 - Prob. 13PCh. 17.11 - Prob. 14PCh. 17.12 - Prob. 15PCh. 17.12 - Prob. 16PCh. 17.14 - Prob. 17PCh. 17.15 - Prob. 18PCh. 17.16 - Prob. 19PCh. 17.17 - Problem 17.20 There is another oxygen-stabilized...Ch. 17 - Prob. 21PCh. 17 - Many ethers, including diethyl ether, are...Ch. 17 - Although epoxides are always considered to have...Ch. 17 - The name of the parent six-membered...Ch. 17 - Prob. 25PCh. 17 - Prob. 26PCh. 17 - Prob. 27PCh. 17 - Prob. 28PCh. 17 - Prob. 29PCh. 17 - Given that: does the product of the analogous...Ch. 17 - Prob. 31PCh. 17 - Prob. 32PCh. 17 - Prob. 33PCh. 17 - Prob. 34PCh. 17 - Prob. 35PCh. 17 - Prob. 36PCh. 17 - When (R)-(+)-2-phenyl-2-butanol is allowed to...Ch. 17 - Prob. 38PCh. 17 - Prob. 39PCh. 17 - Write a mechanism for the following reaction.Ch. 17 - Prob. 41PCh. 17 - Prob. 42PCh. 17 - Prob. 43PCh. 17 - Prob. 44PCh. 17 - Prob. 45PCh. 17 - Prob. 46DSPCh. 17 - Prob. 47DSPCh. 17 - Prob. 48DSPCh. 17 - Prob. 49DSPCh. 17 - Epoxide Rearrangements and the NIH Shift This...Ch. 17 - Epoxide Rearrangements and the NIH Shift This...
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- Acid-catalyzed hydrolysis of the following epoxide gives a trans diol. Of the two possible trans diols, only one is formed. How do you account for this stereoselectivity?arrow_forwardWrite a detailed mechanism for the following reaction. KCN HCNarrow_forwardExplain the following observation. Ethyl 3-phenylpropanoate (C6H5CH2CH2CO2CH2CH3) reacts with electrophiles to afford ortho- and para-disubstituted arenes, but ethyl 3-phenylprop-2-enoate (C6H5CH= CHCO2CH2CH3) reacts with electrophiles to afford meta-disubstituted arenes.arrow_forward
- The following compound may be synthesized through alkylation of an appropriate enamine with an alkyl bromide, followed by hydrolysis of the resulting immonium ion. Using this strategy, provide the necessary starting materials for the synthesis.arrow_forwardWhen 2-methylcyclohexanone is treated with pyrrolidine, two isomeric enamines areformed.Why is enamine A with the less substituted double bond the thermodynamicallyfavored product? (You will find it helpful to examine the models of these twoenamines.)arrow_forwardWhich of the reaction conditions could afford the following transformation?arrow_forward
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