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Alkenes contain the C=C functional group which can be prepared by 1,2-elimination reactions such as:
• dehydration of alcohols (- H2O) or
• dehydrohalogenation of alkyl halides (- HX).
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 dominat