Page 3 Flashcards
What is dehydrohalogenation?
A: Dehydrohalogenation is the removal of the elements HX (a hydrogen and a halogen) from an organic molecule.
Why is dehydrohalogenation considered an example of β elimination?
A: It is called β elimination because the hydrogen atom is removed from the β-carbon relative to the carbon bonded to the halogen.
What bonds are broken during dehydrohalogenation?
A: The C-H bond on the β-carbon and the C-X bond on the α-carbon are broken.
A: A π bond (C=C) is formed between the α and β carbons, and the base forms a bond with H⁺.
What bonds are formed during dehydrohalogenation?
What is the role of the curved arrow formalism in the mechanism?
A: The curved arrows illustrate the flow of electrons, showing the breaking of bonds and the formation of the new π bond.
In dehydrohalogenation, what is the role of the base?
A: The base abstracts a β-hydrogen (H⁺), facilitating the elimination of the halide ion (X⁻).
What is the leaving group in dehydrohalogenation?
A: The halide ion (X⁻) acts as the leaving group.
What is the main product formed in a dehydrohalogenation reaction?
A: An alkene, which contains a double bond (π bond).
Which carbons are labeled α and β in dehydrohalogenation?
A: The α-carbon is the one attached to the halogen (X), and the β-carbon is the carbon adjacent to the α-carbon.
What does the final product of dehydrohalogenation include besides the alkene?
A: The final product includes the conjugate acid of the base (H-B⁺) and the halide ion (X⁻).
