
(a)
Interpretation:
The diene and dienophile from the given compounds has to be predicted.
Concept Introduction:
Diels-Alder reaction:
A conjugated diene reacts with a compound containing a carbon-carbon double bond. It is a cycloaddition reaction, where two reactants form a cyclic product.
Conformation of Diene:
S-cis Conformer: The double bonds are cis about the single bond (s stands for single), in an s-cis conformer.
S-trans Conformer: The double bonds are trans- about the single bond (s stands for single) in an s-trans conformer.
Condition for Diels-Alder reaction:
The conjugate diene must be in an s-cis conformation because when it is in an S-trans conformation, C-1 and C-4 are too far apart to react with the dienophile in a concerted reaction.
(b)
Interpretation:
The diene and dienophile from the given compounds has to be predicted.
Concept Introduction:
Diels-Alder reaction:
A conjugated diene reacts with a compound containing a carbon-carbon double bond. It is a cycloaddition reaction, where two reactants form a cyclic product.
Conformation of Diene:
S-Cis Conformer: The double bonds are cis about the single bond (s stands for single), in an s-cis conformer.
S-trans Conformer: The double bonds are trans- about the single bond (s stands for single) in an s-trans conformer.
Condition for Diels-Alder reaction:
The conjugate diene must be in an s-cis conformation because when it is in an S-trans conformation, C-1 and C-4 are too far apart to react with the dienophile in a concerted reaction.
(c)
Interpretation:
The diene and dienophile from the given compounds have to be predicted.
Concept Introduction:
Diels-Alder reaction:
A conjugated diene reacts with a compound containing a carbon-carbon double bond. It is a cycloaddition reaction, where two reactants form a cyclic product.
Conformation of Diene:
S-Cis Conformer: The double bonds are cis about the single bond (s stands for single), in an s-cis conformer.
S-trans Conformer: The double bonds are trans- about the single bond (s stands for single) in an s-trans conformer.
Condition for Diels-Alder reaction:
The conjugate diene must be in an s-cis conformation because when it is in an S-trans conformation, C-1 and C-4 are too far apart to react with the dienophile in a concerted reaction.

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Chapter 7 Solutions
EBK ESSENTIAL ORGANIC CHEMISTRY
- no Ai walkthroughsarrow_forward136 PRACTICAL SPECTROSCOPY Compound 78 is a high-boiling liquid (boiling point 189° C) that contains halogen, but will not react with alkoxides to yield an halogen. ether. The Mass, IR, and 'H NMR spectra, along with 13C NMR data, are given below. Elemental Analysis: C, 35.32; H, 2.47; contains BC Spectral Data: doublet, 137.4 ppm; doublet, 130.1 ppm; doublet, 127.4 ppm; singlet, 97.3 ppm Absorbance Mass Spectrum Intensity 77 77 204 M + 128 40 60 80 100 120 140 160 180 m/e 200 220 280 240 260 300 Infrared Spectrum Wave Number, cm -1 4000 3000 2500 2000 1500 1300 1200 1100 1000 900 800 700 3 6 7 8 9 10 12 13 15 Wavelength, microns 'H NMR wwwww 5 Structure: www ppm, & ©2000 Brooks/Cole Publishing Com-arrow_forwardno Ai walkthroughsarrow_forward
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- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning

