🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPortuguêsРусскийالعربيةفارسی한국어中文日本語EntityQ900838· pop 16· linked from 245 articlesBredt's ruleEmpirical observation that states that a double bond cannot be placed at the bridgehead of a bridged ring systemConnectionsaromaticityEntityBirch reductionEntityCategoriesEponymous chemical rulesPhysical organic chemistryStereochemistry