Violating Bredt's rule: Chemists just broke a 100-year-old rule and say it's time to rewrite the textbooks

According to Bredt's rule, double bonds cannot exist at certain positions on organic molecules if the molecule's geometry deviates too far from what we learn in textbooks. This rule has constrained chemists for a century. Chemists have now shown how to make molecules that violate Bredt's rule, allowing chemists to find practical ways to make and use them in reactions.

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