Definition

A type of stereoisomer that differs from another isomer in the arrangement of groups around just one specific carbon atom that has four different groups attached to it.

Example

Glucose and galactose are epimers because they differ in the configuration around one carbon atom.

Conversation

Have you ever heard of the term epimer?

Yeah, I think it refers to sugars that differ at just one carbon atom, right?

Exactly! It's interesting how such a small change can make a big difference.

Totally! Chemistry has so many cool details like that.

Synonyms & Antonyms

Root Explanation

Epimer → It is formed from "epi-" (meaning upon or over) and "meros" (meaning part). An epimer is a type of stereoisomer that differs in configuration at only one specific carbon atom, thus relating to the concept of parts being arranged differently.

Memory Tip

Think of 'epi-' meaning 'upon' and 'meros' meaning 'part' — an epimer is a molecule that has a different arrangement of parts at one specific location.

Visually Confused Words