Question

Question:Draw the product (including stereochemistry) formed from each pair ofreactants in a thermal [4 + 2] cycloaddition reaction.

Short answer

For a [4+2] cycloaddition, the bond formation can occur superficially under thermal conditions.

The [4+2] cycloaddition considering HOMO of diene and LUMO of alkene is shown below:

Bond formation between HOMO of diene and LUMO of alkene

Step-by-step solution

[4+2] Cycloaddition reactions

For a [4+2] cycloaddition, the bond formation can occur superficially under thermal conditions.

The [4+2] cycloaddition considering HOMO of diene and LUMO of alkene is shown below:

Bond formation between HOMO of diene and LUMO of alkene

Determination of products

a. Both the reactants are redrawn, and the [4+2] cycloaddition is carried out. The product is shown below:

b. Both the reactants are redrawn, and the [4+2] cycloaddition is carried out. The product is shown below:

[4+2] cycloaddition of compound b