# transannulation

> English word · Noun

## Definitions
1. Any reaction in which one type of ring system (especially a heterocycle) is converted into a different one, normally via an acyclic intermediate

## Etymology
From trans- + annulation.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/transannulation