Bredt's rule

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Notion

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Science and technology

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What Wikipedia says

In organic chemistry, Bredt's rule is the empirical observation that bridged molecules tend only to possess a double bond at the bridgehead in large ring systems. The rule is named after Julius Bredt, who first discussed it in 1902 and codified it in 1924.

Excerpt from the Wikipedia article “Bredt's rule”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jeff Dahl at English Wikipedia, Public domain, via Wikimedia Commons.