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(a)
Interpretation:
The curved-arrow mechanism for the reversible reaction of aryl-sulfonic acid in steam is to be predicted.
Concept introduction:
Electrophilic substitution reactions are that reaction in which an electrophile replaces the atom or function group of a compound. Sulfonation is an electrophilic substitution reaction in which the hydrogen atom of an
(b)
Interpretation:
The identification of compound A, B and C in the given reaction scheme is to be predicted.
Concept introduction:
Electrophilic substitution reactions are that reaction in which an electrophile replaces the atom or function group of a compound. Sulfonation is an electrophilic substitution reaction in which the hydrogen atom of an aromatic ring is replaced by the sulfonic acid functional group.
(c)
Interpretation:
The explanation as to why compound C cannot be synthesized in one step from thiophene.
Concept introduction:
Electrophilic substitution reactions are that reaction in which an electrophile replaces the atom or function group of a compound. Nitration is an electrophilic substitution reaction in which the hydrogen atom of an aromatic ring is replaced by the nitro group.
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Chapter 26 Solutions
EBK ORGANIC CHEMISTRY
- The saccharide shown here is present in some plant-derived foods. (a) Indicate the anomeric carbon atom(s) in this structure by drawing a circle around the atom(s) or by drawing an arrow pointing to the atom(s). (b) Would this saccharide give a positive result with Benedict’s reagent? Why or why not? (c) Would this saccharide give a positive result with Barfoed’s reagent? Why or why not? (d) Would this saccharide give a positive result with Seliwanoff’s reagent? Why or why not? (e) In a separate set of experiments, the saccharide solution was treated with a reagent that breaks glycosidic bonds. After this treatment, would any of the three assays give different results? Be sure to indicate which assay results would be different and give a reason.arrow_forward(b) Suggest a reasonable biosynthesis for the naturally occurring alkaloid coniine (isolated from hemlock), starting from octanoic acid. Coniinearrow_forwardSafrole, which is isolated from sassafras (Problem 21.33), can be converted to the illegal stimulant MDMA (3,4- methylenedioxymethamphetamine, “Ecstasy”) by a variety of methods. (a) Devise a synthesis that begins with safrole and uses a nucleophilic substitution reaction to introduce the amine. (b) Devise a synthesis that begins with safrole and uses reductive amination to introduce the amine.arrow_forward
- Safrole, which is isolated from sassafras (Problem 21.33), can be converted to the illegal stimulant MDMA (3,4-methylenedioxymethamphetamine, "Ecstasy") by a variety of methods. (a) Devise a synthesis that begins with safrole and uses a nucleophilic substitution reaction to introduce the amine. (b) Devise a synthesis that begins with safrole and uses reductive amination to introduce the amine. NHCH9 MDMA safrolearrow_forward(a) Which of the following phenols is the least acidic? (b) Which of the following phenols is the most acidic?arrow_forward(a) Draw the mechanism for the formation of both of the enols that can be formed from A (use acetic acid & AcOH as the source of the protons) (b) Draw the mechanism of reaction of this enol with bromine to give product Barrow_forward
- The hydrocarbon fluorene was treated with potassium t-butoxide in an acid-base reaction, giving the fluorenide anion and t-butyl alcohol. (a) Which way does the equilibrium lie, and by how much? b) What is the proportion of the fluorenide anion to fluorene? (c) Why is fluorene so highly acidic, considering the pKa of an average alkane is above 50?arrow_forwardGive reasons :(a) n-Butyl bromide has higher boiling point than f-butyl bromide.(b) Racemic mixture is optically inactive.(c) The presence of nitro group (-NO2) at o/p positions increases the reactivity of haloarenes towards nucleophilic substitution reactions.arrow_forward(a) Explain the mechanism of a nucleophilic attack on the carbonyl group of an aldehyde or a ketone.(b) An organic compound (A) (molecular formula CgH16Q2) was hydrolysed with dilute sulphuric acid to give a carboxylic acid (B) and an alcohol (C). Oxidation of (C) with chromic acid also produced (B). On dehydration (C) gives but-1-ene. Write the equations for the reactions involved.arrow_forward
- 11:43 Q1. (a) (c) (d) (b) Two stereoisomers of but-2-ene are formed when 2-bromobutane reacts with ethanolic potassium hydroxide. (i) Explain what is meant by the term stereoisomers. Library Name and outline a mechanism for the reaction of 2-bromo-2-methylpropane with ethanolic potassium hydroxide to form the alkene 2-methylpropene, (CH3)2C=CH₂ Name of mechanism Mechanism (ii) Draw the structures and give the names of the two stereoisomers of but-2-ene. Stereoisomer 1 Name (iii) Name this type of stereoisomerism. Select Name Stereoisomer 2 When 2-bromo-2-methylpropane reacts with aqueous potassium hydroxide, 2-methylpropan-2-ol is formed as shown by the following equation. CH3 H₂C-C-CH3 + KOH Br Page 2 of 14 CH3 H3C-C-CH3 + KBr ОН State the role of the hydroxide ions in this reaction. Write an equation for the reaction that occurs when CH3CH₂CH₂CH₂Br reacts with an excess of ammonia. Name the organic product of this reaction. Equation Name of product 9,284 Photos, 1,166 Videos For You…arrow_forwardAnswer BOTH parts of this question. (a) Briefly explain the origin of amine basicity. Using resonance structures explain why aniline is a weaker base than methylamine. (b) Draw the structure of compound X and provide a curly arrow mechanism for the reduction in Scheme 1. X 1. NaBH4 2. H₂O Scheme 1 OHarrow_forward(a) Draw two different halo ketones that can form A by an intramolecular alkylation reaction. (b) How can A be synthesized by an acetoacetic ester synthesis? of Aarrow_forward
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