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One exception in organic nomenclature

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The priority of amine is higher than alkene still the compound above uses hexene as suffix name? What are then priority used for? And how does one determine the rank of the suffix ending? Do you have a general table or explanation?

(see attached table)

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Determining the primary functional group:

When there is more than one functional group present in a molecule, the group with the highest priority (usually the most oxidized one) is determined from your given table.

For example,
(see attached file ...

Solution Summary

This solution points out a specific exception to the general rule in organic nomenclature and explains why this exception occurs, in order to help enhance the student's understanding of the concept.