Elimination Reactions - Organic Chemistry

                                           Elimination Reactions - Organic Chemistry

When two groups or atoms from adjacent carbons are eliminated...


Elimination Reactions
When two groups or atoms from adjacent carbons are eliminated with the formation of unsaturated compounds (alkene or alkyne), the reaction is called elimination reaction.

Huckel's rule: Huckel's rule based on molecular orbital calculations, predicts that electron rings will constitute an aromatic system only if the number of electrons in the ring is of the form, (4n + 2)  electron system, where n is zero or any positive integer. The rule predicts that rings of 2, 6, 10, 14 etc., electrons will be aromatic, while rings of 4, 8, 12, etc., will not be aromatic, while rings of 4, 8, 12, etc., will not be.

Antiaromaticity: Electron rings will constitute an antiaromatic system, if the number of electrons in the ring is of the form, 4n electron system, where n is any positive number.

For aromaticity and antiaromaticity, the molecule must be planar.

e.g.,is an antiaromatic compound.

Cyclooctatetraene is not planar but tub-shaped. Hence, it is neither aromatic nor antiaromatic. The reason for the lack of planarity is that a regular octagon has angles of 135.

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