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1. How many new bonds, and of what type (sigma or pi), are created in a Diels-Alder reaction? With website references.
Accepted Answer
In a Diels-Alder reaction, two new sigma bonds and one new pi bond are formed.
The reaction involves the formation of a six-membered ring. The diene (4π electrons) reacts with a dienophile (2π electrons) to form a cyclic adduct.
You can find more information on Diels-Alder reactions and bond formation in the following resources:
Chemistry LibreTexts: [https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Book%3A_Organic_Chemistry_with_a_Biological_Emphasis_(David_R._Klein)/Chapter_11%3A_Reactions_of_Alkenes_Alkynes_and_Pi_Systems/11.06%3A_The_Diels-Alder_Reaction](https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Book%3A_Organic_Chemistry_with_a_Biological_Emphasis_(David_R._Klein)/Chapter_11%3A_Reactions_of_Alkenes_Alkynes_and_Pi_Systems/11.06%3A_The_Diels-Alder_Reaction)
Organic Chemistry Portal: [https://www.organic-chemistry.org/namedreactions/diels-alder-reaction.shtm](https://www.organic-chemistry.org/namedreactions/diels-alder-reaction.shtm)
Wikipedia: [https://en.wikipedia.org/wiki/Diels%E2%80%93Alder_reaction](https://en.wikipedia.org/wiki/Diels%E2%80%93Alder_reaction)
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