(a) Give the major Diels-Alder product (including stereochemistry & regiochemistry) of the reaction shown below. (b) Use the circle method to explain how you determined the stereochemistry of the diene. (c) Use resonance structures to explain how you determined the regiochemistry. (d) Is your product the endo or exo product? Explain how you determined which one you drew. (e) Show the orbital overlap between the LUMO of the dieneophile and the diene HOMO (given above) for each process (con-rotary and dis-rotary). (f) Using the orbital overlap, which process (con-rotary or dis-rotary) is thermally allowed? Explain. (g) Based on the observed stereochemistry of your product, was your product produced via the thermally allowed process? Explain. OCH3 + NO₂ ?

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Problem: FM8 Theory can also be used to explain the stereochemistry of a Diels-Alder reaction. When a diene undergoes a Diels-Alder
reaction, the terminal carbon atoms must rotate in order to form the new sigma bonds. The diagram below shows the two possible ways this
rotation can occur, and how the diene HOMO is affected by each.
H₂CO
H₂CO
H H₂C
Diene HOMO
H H₂C
H
OCH3
H
con-rotatory
alignment
dis-rotatory
alignment
H
NO₂
H.CO
H
H.CO
H
^.
CH3
(a) Give the major Diels-Alder product (including stereochemistry & regiochemistry) of the reaction shown below. (b) Use the circle method to
explain how you determined the stereochemistry of the diene. (c) Use resonance structures to explain how you determined the
regiochemistry. (d) Is your product the endo or exo product? Explain how you determined which one you drew. (e) Show the orbital overlap
between the LUMO of the dieneophile and the diene HOMO (given above) for each process (con-rotary and dis-rotary). (f) Using the orbital
overlap, which process (con-rotary or dis-rotary) is thermally allowed? Explain. (g) Based on the observed stereochemistry of your product,
was your product produced via the thermally allowed process? Explain.
CH₂
H
Transcribed Image Text:Problem: FM8 Theory can also be used to explain the stereochemistry of a Diels-Alder reaction. When a diene undergoes a Diels-Alder reaction, the terminal carbon atoms must rotate in order to form the new sigma bonds. The diagram below shows the two possible ways this rotation can occur, and how the diene HOMO is affected by each. H₂CO H₂CO H H₂C Diene HOMO H H₂C H OCH3 H con-rotatory alignment dis-rotatory alignment H NO₂ H.CO H H.CO H ^. CH3 (a) Give the major Diels-Alder product (including stereochemistry & regiochemistry) of the reaction shown below. (b) Use the circle method to explain how you determined the stereochemistry of the diene. (c) Use resonance structures to explain how you determined the regiochemistry. (d) Is your product the endo or exo product? Explain how you determined which one you drew. (e) Show the orbital overlap between the LUMO of the dieneophile and the diene HOMO (given above) for each process (con-rotary and dis-rotary). (f) Using the orbital overlap, which process (con-rotary or dis-rotary) is thermally allowed? Explain. (g) Based on the observed stereochemistry of your product, was your product produced via the thermally allowed process? Explain. CH₂ H
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