# photocyclization

> English word · Noun

## Definitions
1. Any intramolecular photochemical process leading to a ring system by formation of one new single bond, either by a concerted process (e.g., electrocyclization) or by multi-step processes such as the Norrish-Yang reaction.

## Etymology
From photo- + cyclization.

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