Zaitsev Rule

the principle governing the separation of the elements of a hydrogen halide from alkyl halides. According to the rule, when an HX molecule (X is a halogen atom) is separated from an alkyl halide, the hydrogen is lost from the carbon atom with the least number of hydrogen atoms, that is, from the least hydrogenated one. For example, when (CH₃)₂ CHCHICH₃ is treated with an alcohol solution of KOH, the main product that forms is trimethylethylene (CH₃)₂C═CHCH₃; only an insignificant amount of (CH₃)₂CH—CH═CH₂ forms. The Zaitsev rule was formulated by A. M. Zaitsev in 1875.

单词	zaitsev rule
释义	Zaitsev Rule Zaitsev Rule the principle governing the separation of the elements of a hydrogen halide from alkyl halides. According to the rule, when an HX molecule (X is a halogen atom) is separated from an alkyl halide, the hydrogen is lost from the carbon atom with the least number of hydrogen atoms, that is, from the least hydrogenated one. For example, when (CH₃)₂ CHCHICH₃ is treated with an alcohol solution of KOH, the main product that forms is trimethylethylene (CH₃)₂C═CHCH₃; only an insignificant amount of (CH₃)₂CH—CH═CH₂ forms. The Zaitsev rule was formulated by A. M. Zaitsev in 1875.
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