Organic Chemistry
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The following two molecules can undergo a thermally allowed cycloaddition reaction. Show the reaction, and explain why it is allowed.
Show that the [6+2]cyclization of (Z)-3,4-dimethylhexa-1,3,5-triene: with 1,2-dioxine-3,6-dione is thermally forbidden but photochemically allowed.
Propose a plausible Diels–Alder product of the following reaction when it is heated instead.
Maleic anhydride does not react with but-2-ene but reacts rapidly with 2,3-dimethylbuta-1,3-diene under thermal conditions. Why do these observations occur under thermal conditions?
Give a two-step reaction for the conversion of the reactant to the product.
Consider the below-given reactions. Why does cyclopenta-2,4-dien-1-one react with two π electrons in the first reaction and with four π electrons in the second?