ORGANIC CHEMISTRY
6th Edition
ISBN: 9781266633973
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 21.2, Problem 4P
When phenylacetaldehyde
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H3C.
H3C.
CH3
nnc» XT
:OH
2 CH₂OH
HCI catalyst
Aldehydes and ketones react reversibly with two equivalents of alcohol in the presence of an acid catalyst to give acetals. Alcohols are poor nucleophiles, and so protonation of the carbonyl oxygen is
used to make the carbonyl carbon a stronger electrophile. Addition of the first equivalent of alcohol gives a hemiacetal, a hydroxyether. Addition of the second equivalent of alcohol is accompanied by
loss of water to yield the product acetal.
Draw curved arrows to show the movement of electrons in this step of the mechanism.
Arrow-pushing Instructions
CH3
H3C
CH3OH
H3CQ OCH3
CH3
H3C.
H
HO: :OCH 3
CH3
46
An alkene is treated with OsO4 followed by H2O2. When the resulting diol is treated with HIO4, the only product obtained is an unsubstituted cyclic ketone with molecular formula C6H10O. What is the structure of the alkene?
When cis-2-decalone is dissolved in ether containing a trace of HCI, an equilibrium is
established with trans-2-decalone. The latter ketone predominates in the equilibrium
mixture.
H
H
HCI
cis-2-Decalone
trans-2-Decalone
Propose a mechanism for this isomerization and account for the fact that the trans iso-
mer predominates at equilibrium.
Chapter 21 Solutions
ORGANIC CHEMISTRY
Ch. 21.2 - Problem 23.1 Draw the enol or keto tautomer(s) of...Ch. 21.2 - Problem 23.3 When phenylacetaldehyde is dissolved...Ch. 21.3 - Prob. 5PCh. 21.3 - Problem 23.5 Which bonds in the following...Ch. 21.3 - Prob. 7PCh. 21.3 - Prob. 8PCh. 21.3 - Prob. 9PCh. 21.4 - Prob. 10PCh. 21.5 - Prob. 11PCh. 21.7 - Problem 23.11 Draw the products of each...
Ch. 21.7 - Problem 23.12 Draw the products of each reaction....Ch. 21.7 - Prob. 14PCh. 21.7 - Prob. 15PCh. 21.8 - Prob. 16PCh. 21.8 - Prob. 17PCh. 21.8 - Prob. 18PCh. 21.8 - Problem 23.18 How can pentan-2-one be converted...Ch. 21.8 - Problem 23.19 Identify A, B, and C, intermediates...Ch. 21.9 - Problem 23.20 Which of the following compounds...Ch. 21.9 - Problem 23.21 Draw the products of each...Ch. 21.9 - Prob. 23PCh. 21.9 - Prob. 24PCh. 21.9 - Prob. 25PCh. 21.10 - Prob. 26PCh. 21.10 - Prob. 27PCh. 21.10 - Prob. 28PCh. 21.10 - Prob. 29PCh. 21 - 23.29 Draw enol tautomer(s) for each compound....Ch. 21 - 22.30 The cis ketone A is isomerized to a trans...Ch. 21 - 23.31 Draw enol tautomer(s) for each compound.
...Ch. 21 - Prob. 33PCh. 21 - Prob. 34PCh. 21 - 23.35 Rank the labeled protons in each compound in...Ch. 21 - Prob. 36PCh. 21 - Prob. 37PCh. 21 - 23.38 Acyclovir is an effective antiviral agent...Ch. 21 - 23.39 Explain why forms two different alkylation...Ch. 21 - Prob. 40PCh. 21 - 23.42 Draw a stepwise mechanism for the following...Ch. 21 - Prob. 42PCh. 21 - Prob. 43PCh. 21 - 23.45 Devise a synthesis of valproic acid , a...Ch. 21 - Prob. 57PCh. 21 - 23.57 Draw a stepwise mechanism showing how two...Ch. 21 - 23.58 Draw a stepwise mechanism for the following...Ch. 21 - Prob. 65PCh. 21 - 23.66 Synthesize (Z)-hept-5-en-2-one from ethyl...
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- Ethylene oxide is the starting material for the synthesis of 1,4-dioxane. Propose a mechanism for each step in this synthesis.arrow_forwardWhen cis-2-decalone is dissolved in ether containing a trace of HCl, an equilibrium is established with trans-2-decalone. The latter ketone predominates in the equilibrium mixture. Propose a mechanism for this isomerization and account for the fact that the trans isomer predominates at equilibrium.arrow_forwardClaisen rearrangement of an allyl phenyl ether with substituent groups in both ortho positions leads to the formation of a para-substituted product. Propose a mechanism for the following rearrangement.arrow_forward
- A step in a synthesis of PGE1 (prostaglandin E1, alprostadil) is the reaction of a trisubstituted cyclohexene with bromine to form a bromolactone. Propose a mechanism for formation of this bromolactone and account for the observed stereochemistry of each substituent on the cyclohexane ring. Alprostadil is used as a temporary therapy for infants born with congenital heart defects that restrict pulmonary blood flow. It brings about dilation of the ductus arteriosus, which in turn increases blood flow in the lungs and blood oxygenation.arrow_forwardThe Meerwein-Ponndorf-Verley reaction involves reduction of a ketone by treatment with an excess of aluminum triisopropoxide, [(CH3)2CHO]3Al. The mechanism of the process is closely related to the Cannizzaro reaction in that a hydride ion acts as a leaving group. Propose a mechanism.arrow_forwardClaisen condensation between diethyl phthalate and ethyl acetate followed by saponification, acidification, and decarboxylation forms a diketone, C9H6O2. Propose structural formulas for compounds A and B and the diketone.arrow_forward
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- H3C OH OH H+ CH3 Esters can be synthesized by an acid-catalyzed nucleophilic acyl substitution between an alcohol and a carboxylic acid; this process is called the Fischer esterification reaction. Because the alcohol oxygen is a poor nucleophile, the carbonyl carbon is made a better electrophile by protonation of the carbonyl oxygen. The steps of the synthesis are all reversible. The reaction is generally driven to completion by using an excess of the liquid alcohol as a solvent, or by distilling off the product as it forms. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions CIX 10-4 H₂O CH3 H₂O CH3arrow_forwardDraw the structures of the initially formed enol tautomers in the reactions of propyne and dicyclohexylethyne with dicyclohexylborane followed by NaOHNaOH and H2O2H2O2arrow_forwardDihydropyran is synthesized by treating tetrahydrofurfuryl alcohol with an arenesul- fonic acid, ARSO,H. Propose a mechanism for this conversion. ARSO,H OH + H,O Tetrahydrofurfuryl Dihydropyran alcoholarrow_forward
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