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Chapter 5:
Structure and Preparation of Alkenes.
Elimination Reactions
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Summary:

Alkenes contain the C=C functional group which can be prepared by 1,2-elimination reactions such as:

Zaitsev's rule indicates that the preferred product is the more highly substituted, and therefore more stable alkene. But the rule is not always obeyed and the anti-Zaitsev (or Hofmann) product can dominate.
 

Alkenes:

Preparation of Alkenes: 1,2 Elimination Reactions: Problems