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Why is sodamide used in dehydrohalogenation of vicinal dihalides to remove HX from alkenyl halide in place of alcoholic KOH?

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Why is sodamide used in dehydrohalogenation of vicinal dihalides to remove HX from alkenyl halide in place of alcoholic KOH?

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  • Sodamide (NaNH2) is a strong base and hence, helps in complete conversion of alkenyl halide formed in the first step to form alkynes.
  • The base (KOH or NaOH) used in first step gives alkynes in poor yield and hence, stronger bases such as NaNH2 on KNH2 are used in second step.
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