# Bredt's rule

> Empirical observation that states that a double bond cannot be placed at the bridgehead of a bridged ring system

**Wikidata**: [Q900838](https://www.wikidata.org/wiki/Q900838)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Bredt's_rule)  
**Source**: https://4ort.xyz/entity/bredt-s-rule


## References

1. [Ueber isomere Dehydrocamphersäuren, Lauronolsäuren und Bihydrolauro-Lactone. 1902](https://zenodo.org/records/1426048)
2. Freebase Data Dumps. 2013