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(5) Free-radical addition of hydrogen halides to alkenes - Anti- - page 8 / 13

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The Preparation of Alkynes:

Remember how we generated carbon-carbon double bonds by -elimination of HX from an alkyl halide:

A similar double -elimination of HX from a 1,2- or vicinial alkyl dihalide generates a triple bond:

If we remember that 1,2-dihalides are themselves prepared by the electrophilic addition of a halogen to an alkene we have a sequence of reactions for converting double to triple bonds:

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