Concept explainers
(a)
Interpretation: The curved arrows are to be used to show the conversion of A and B to C.
Concept introduction: The Diels-Alder reactions are the
Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows. An electronegative element in the reaction attracts electron toward it.
Half headed arrows are used to show the flow of single electrons, while the full headed arrow shows the movement of electron pairs.
(b)
Interpretation: The bonds that are broken and formed in the given reaction are to be identified.
Concept introduction: The bonds in the reactions are broken to form the new compounds. During the formation of products, new bonds are formed. The sum of bonds broken and bonds formed in the reactions are used to calculate the enthalpy change in the reaction.
(c)
Interpretation: The reaction is endothermic or exothermic is to be identified.
Concept introduction: The chemical reaction in which energy is released during the formation of products is known as exothermic reactions. The energy released during the reaction is denoted by
(d)
Interpretation: Entropy favors the reactants or products are to be identified.
Concept introduction: The change in Gibbs free energy, enthalpy and entropy is represented by
The change in Gibbs free energy describes the spontaneity of the reaction. The change in enthalpy describes the relative bond strength in the substance, whereas the change in entropy describes the randomness in the system.
(e)
Interpretation: The Diels-Alder reaction is to be classified as a substitution, elimination, or addition reaction.
Concept introduction: The substitution reactions involve the substitution or replacement of an atom or group of atoms in a compound by anotheratom or groups of atoms. In the substitution reactions, the replacement takes place by the break down of sigma bonds.
In elimination reaction, the formation of
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Organic Chemistry (6th Edition)
- What is the major organic product of the following Diels-Alder reaction? Me₂N. A. B. C. D. Me₂N Me₂N Me₂N OHC Me₂N CHO CHO CHO CHO 5 heatarrow_forward70 ins210 V16225050 panx qalborgo 3) In a recently-published synthesis of yohimbine (used in folk medicine as an aphrodisiac), the Diels-Alder reaction was used to form a new ring during a key step. R OtBu Diels-Alder a. Draw a circle around the four atoms of the diene group in this molecule. b. Draw a square around the two atoms of the best dienophile group in this molecule. c. Draw the product of this reaction, ignoring stereochemistry.arrow_forward7) You want to synthesize 3-methyl-2-pentene from 2-chloro-3-methylpentane. Which reagent would you use? a. HCI, heat b. NH:(aq), 25°C c. CH:CO2NA, CH:CO2H, heat d. CH3CH2ONA, CH3CH2OH, heat e. CН:CH2ОН, heatarrow_forward
- D. Provide a reasonable mechanism for the Diels-Alder reaction between two molecules of cyclopenta-1,3-diene. Br 1. Mg 2.CO₂ 3. H₂O* OHarrow_forwardSelect the two compounds that could be used to make Compound V through a Diels-Alder reaction. CN CN Compound V C NC. CN E CN CN H.arrow_forwardIn a Diels-Alder reaction, compound will react the fastest and will react the slowest. CN NH2 CN CN IV A. I, I B. I, III C. II, V D. II, I E. IV, V O A C E > > B.arrow_forward
- Please show all arrow pushing mechanisais. Thank you!arrow_forwardBr2 ? How many moles of Br are required to completely halogenate the alkene? A. Three moles B. Four moles C. Two moles D. One mole What is the expected arrangement of the bromine atoms relative to each other among the carbon involved in pi bonding? A. trans-configuration B. anti-conformation C. cis-configuration D. syn-conformation What happens to bromine when it is adjacent to an alkene during a chemical reaction? A. Bromine becomes polarized. B. Bromine becomes acidic. C. Bromine becomes hybridized. D. Bromine becomes stable. The relative arrangement of bromine atoms in the product is primarily due to: A. Hydrogen bonding B. Electronegativity C. Atomic weight D. Repulsion What is your observation after the reaction? A. Bromine water decolorizes. B. A brown precipitate forms. C. The alkene becomes denser. D. A yellow flame is produced.arrow_forward3. Predict the products of the following Diels-Alder reactions. a. NC a. 4. Identify the diene and dienophile used to make these Diel-Alder products. CN CH3 CN CH 3 CO₂CH3 CO₂CH3arrow_forward
- Draw the structures of the products obtained from the reaction of each enantiomer of cis-1-chloro-2-isopropylcyclopentane with sodium methoxide in methanol. b. Are all the products optically active? c. How would the products differ if the starting material were the trans isomer? Are these products optically active? d. Will the cis enantiomers or the trans enantiomers form substitution products more rapidly? e. Will the cis enantiomers or the trans enantiomers form elimination products more rapidly?arrow_forwardDraw the products obtained from the SN2 reaction of a. 2-bromobutane and methoxide ion. b. (R)-2-bromobutane and methoxide ion. c. (S)-3-chlorohexane and hydroxide ion. d. 3-iodopentane and hydroxide ion.arrow_forward2. Name each alkyne. a. CH3CH₂CH₂C=CH b. CH3CH₂CH₂C=CCH3 3. Predict the product of the following reactions. a. CH = CCH3 + HCI b. CH CCH₂CH3 + O2arrow_forward