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The 100-year-old Bredt’s rule — which was proposed in 1924 by organic chemist Julius Bredt — states that, in small molecules made up of two rings that share atoms, such as some types of alkene, double bonds between two carbon atoms cannot occur where the rings join together, called the bridgehead position.
Chemists make ‘impossible’ molecules that break 100-year-old bonding rule Gemma Conroy 2024
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