Lecture on Conjugation in Organic Chemistry

These flashcards cover key vocabulary and concepts related to conjugation, reactions, and properties in organic chemistry, as outlined in the lecture notes.

Conjugation

The overlap of p-orbitals in alternating double and single bonds, allowing for delocalization of electrons.

Diels-Alder Reaction

A chemical reaction between a diene and a dienophile to form a cyclic product, typically in a concerted mechanism.

Electrophilic addition

A reaction where an electrophile reacts with a nucleophile to add across a double bond.

HOMO

Highest Occupied Molecular Orbital, the orbital with the highest energy that contains electrons.

LUMO

Lowest Unoccupied Molecular Orbital, the orbital with the lowest energy that does not contain electrons.

Bond length

The distance between the nuclei of two bonded atoms, which can change based on the type and number of bonds.

Stability of Conjugated Systems

More conjugation leads to increased stability due to delocalization of electrons and lowering of potential energy.

cis and trans products

The stereochemistry of the product in a Diels-Alder reaction depends on the geometry of the dienophile.

Anti-bonding Molecular Orbital

A molecular orbital that is higher in energy than the atomic orbitals that combined to form it, often leading to destabilization.

Hybridization

The concept of mixing atomic orbitals to form new hybrid orbitals, such as sp2 hybridization in conjugated systems.