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Concept explainers
Interpretation:
The way in which the given mixture of compounds is synthesized is to be suggested, and the reaction involved in the given conversion is to be represented.
Concept introduction:
Electrophiles are electron-deficient species, which has positive or partially positive charge. Lewis acids are electrophiles that accept electron pair.
Nucleophiles are electron-rich species, which has negative or partially negative charge. Lewis bases are nucleophiles that donate electron pair.
Free radical is an atom, molecule or ion that has an unpaired electron, which makes it highly chemically reactive.
Substitution reaction: A reaction in which one of the hydrogen atoms of a hydrocarbon or a
Elimination reaction: A reaction in which two substituent groups are detached and a double bond is formed is called elimination reaction.
Addition reaction: It is the reaction in which unsaturated bonds are converted to saturated molecules by the addition of molecules.
Benzene and substituted benzene undergo electrophilic substitution reactions in the presence of an electrophilic reagent.
The electrophilic substitution on the substituted benzene depends upon the nature of the substituent present on the benzene ring. If the group is ortho-para directing, ortho and para isomers will be formed as the product and if the group is meta-directing, a meta product is formed.
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Chapter 21 Solutions
Organic Chemistry
- Ibufenac, a para-disubstituted arene with the structure HO2CCH2C6H4CH2CH(CH3)2, is a much more potent analgesic than aspirin, but it was never sold commercially because it caused liver toxicity in some clinical trials. Devise a synthesis of ibufenac from benzene and organic halides having fewer than five carbons.arrow_forwardShow how you would synthesize octan-2-one from each compound. You may use any necessary reagents.(a) heptanalarrow_forwardPredict which member of each pair is more acidic, and explain the reasons for your predictions.(a) cyclopentanol or 3-chlorophenol (b) cyclohexanol or cyclohexanethiol(c) cyclohexanol or cyclohexanecarboxylic acid (d) butan-1-ol or 2,2-dichlorobutan-1-olarrow_forward
- The following questions concern ethyl (2-oxocyclohexane)carboxylate.(a) Write a chemical equation showing how you could prepare ethyl (2-oxocyclohexane)-carboxylate by a Dieckmann cyclization.(b) Write a chemical equation showing how you could prepare ethyl (2-oxocyclohexane)-carboxylate by acylation of a ketone.(c) Write structural formulas for the two most stable enol forms of ethyl (2-oxocyclohexane)carboxylate.(d) Write the three most stable resonance contributors to the most stable enolate derived from ethyl (2-oxocyclohexane)carboxylate.(e) Show how you could use ethyl (2-oxocyclohexane)carboxylate to prepare 2-methylcyclohexanone.(f) Give the structure of the product formed on treatment of ethyl (2-oxocyclohexane)-carboxylate with acrolein (H2C=CHCH=O) in ethanol in the presence of sodium ethoxidearrow_forwardCompound A has molecular formula C7H15B.. Treatment of compound A with sodium ethoxide yields only one elimination product (compound B) and no substitution products. When compound B is treated with dilute sulfuric acid, compound C is obtained, which has molecular formula C7H160. Draw the structures of compounds A, B, and C.arrow_forwardRank the compounds in each set in order of increasing acid strength.(a) CH3CH2COOH CH3CHBrCOOH CH3CBr2COOHarrow_forward
- Give the structure of the principal product(s) when each of the following alcohols reactswith (1) Na2Cr2O7>H2SO4, (2) PCC, (3) DMP, and (4) 1 equiv NaOCl-TEMPO.(a) octan-1-ol (b) octan-3-ol(c) 4-hydroxydecanalarrow_forwardA key step in the synthesis of the narcotic analgesic meperidine (tradename Demerol) is the conversion of phenylacetonitrile to X. (a) What isthe structure of X? (b) What reactions convert X to meperidine ?arrow_forwardTreatment of W with CH3Li, followed by CH3I, affords compound Y(C7H14O) as the major product. Y shows a strong absorption in its IRspectrum at 1713 cm−1, and its 1H NMR spectrum is given below. (a)Propose a structure for Y. (b) Draw a stepwise mechanism for theconversion of W to Y.arrow_forward
- Ibufenac, a para-disubstituted arene with the structureHO2CCH2C6H4CH2CH(CH3)2 , is a much more potent analgesic thanaspirin, but it was never sold commercially because it caused livertoxicity in some clinical trials. Devise a synthesis of ibufenac frombenzene and organic halides having fewer than five carbons.arrow_forwardBenzoic acid, Ph-COOH (C6H5CO2H), is not soluble in water while it dissolves in ether (diethyl ether), (CH3CH2)2O. Yet upon treatment with sodium hydroxide, benzoic acid turns hydrophilic and dissolves in water. Provide chemical explanation of this observation.arrow_forwardHow will you synthesize cyclohexanecarboxaldehyde (cyclohexylmethanal) from the following reagents? (There are no restrictions on the reagents or the number of steps). (a) Cyclohexanone (b) Ethynylcyclohexane (c) Methyl cyclohexylformate (Remember: Formic acid is the IUPAC recognized name for Methanoic acid) (d) Cyclohexanecarboxylic acid (Cyclohexylmethanoic acid) (e) Vinylcyclohexanearrow_forward
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