Show that [4+4] cycloaddition of two butadiene molecules to give cycloocta-1,5-diene is thermally forbidden but photochemically allowed b.Thermally allowed cycloaddition of the two butadiene molecules when there's a different. Show reaction and explain why it is thermally allow

Show that [4+4] cycloaddition of two butadiene molecules to give cycloocta-1,5-diene is thermally forbidden but photochemically allowed b.Thermally allowed cycloaddition of the two butadiene molecules when there's a different. Show reaction and explain why it is thermally allow

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter14: Conjugated Compounds And Ultraviolet Spectroscopy

Section14.SE: Something Extra

Problem 41AP: Although the Dielsâ€“Alder reaction generally occurs between an electronrich diene and an...

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a. Show that [4+4] cycloaddition of two butadiene molecules to give cycloocta-1,5-diene is thermally forbidden but photochemically allowed

b.Thermally allowed cycloaddition of the two butadiene molecules when there's a different. Show reaction and explain why it is thermally allow

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Why does a [2+2] cycloaddition reaction require a thermal condition to be met for initiation?
6. Answer ALL parts of this question: a) Draw all the molecular orbitals of ethene and buta-1,3-diene, indicating where applicable which are the HOMOS and which are the LUMOS in both the ground state and first excited state. b) Use relevant orbitals from those drawn above to explain why buta-1,3- diene reacts with ethene in a [4+2] cycloaddition reaction under thermal conditions, but if two molecules of ethene are to dimerise in a [2+2] cycloaddition reaction, then the reaction must be irradiated with ultraviolet light. c) Identify compound X in the following reaction (Scheme 4) and draw curly arrow mechanisms that lead to it and then lead from it to the final products. CO, Me .CO, Me heat heat CO,Me СО Ме Scheme 4 d) The reaction shown below (Scheme 5) is another example of a cycloaddition reaction. Identify the number of electrons involved in it, draw a curly arrow mechanism leading to the product and suggest whether this reaction would take place under thermal or photochemical…
6. Answer ALL parts of this question: a) Draw all the molecular orbitals of ethene and buta-1,3-diene, indicating where applicable which are the HOMOS and which are the LUMOS in both the ground state and first excited state. b) Use relevant orbitals from those drawn above to explain why buta-1,3- diene reacts with ethene in a [4+2] cycloaddition reaction under thermal conditions, but if two molecules of ethene are to dimerise in a [2+2] cycloaddition reaction, then the reaction must be irradiated with ultraviolet light. c) Identify compound X in the following reaction (Scheme 4) and draw curly arrow mechanisms that lead to it and then lead from it to the final products. CO Me CO₂Me heat heat X CO₂Me CO Me Scheme 4 d) The reaction shown below (Scheme 5) is another example of a cycloaddition reaction. Identify the number of electrons involved in it, draw a curly arrow mechanism leading to the product and suggest whether this reaction would take place under thermal or photochemical…
Show that a thermal suprafacial addition is symmetry allowed in a [4 + 2] cycloaddition by using the HOMO of the alkene and the LUMO of the diene.
6.) For the following reactions, please draw the structures of both the diene and dienophile that would afford the depicted Diels Alder adducts. 1. Cl ? ? cl Diene Dienophile cl Cl 2. CH3 O CH3 ? CH3 Diene Dienophile CH3 3. ? + ? Diene Dienophile 4. CH3 ? + Diene Dienophile CH3
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