Alkene preparation reactions
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Alkene Preparation Reactions. Alkyne reductions Syn orientation Anti orientation Elimination reactions Alcohol dehydration Alkyl halide dehydrohalogenation Vicinal dihalide dehalogenation. Alkenes via Alkyne Reduction. Syn reduction of Alkynes to Alkenes

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Alkene preparation reactions
Alkene Preparation Reactions

  • Alkyne reductions

    • Syn orientation

    • Anti orientation

  • Elimination reactions

    • Alcohol dehydration

    • Alkyl halide dehydrohalogenation

    • Vicinal dihalide dehalogenation


Alkenes via alkyne reduction
Alkenes via Alkyne Reduction

  • Syn reduction of Alkynes to Alkenes

    • Catalytic Hydrogenation using a poisoned catalyst

  • Anti reduction of Alkynes to Alkenes

    • Dissolving Metal reduction



  • Alcohol elimination
    Alcohol Elimination

    • E-1

    • Unimolecular kinetics

    • Carbocation intermediates

    • Skeletal rearrangements possible



    Dehydrohalogenation of alkyl halides

    Dehydrohalogenation of Alkyl Halides

    Unimolecular versus Bimolecular elimination


    Bimolecular dehydrohalogenation of alkyl halides
    BimolecularDehydrohalogenation of Alkyl Halides

    Periplanar anti-elimination


    Dehalogenation of vicinal dihalides
    Dehalogenation of Vicinal Dihalides

    • E-2

    • Bimolecular kinetics

    • Periplanar Anti-orientation

    • No skeletal rearrangements possible


    E 2 dehalogenation of vicinal dihalides
    E-2 Dehalogenation of Vicinal Dihalides

    Periplanar anti-elimination


    Alkyne preparation reactions
    Alkyne Preparation Reactions

    • Elimination

      • Vicinal tetrahalide dehalogenation

      • Vicinal dihalide dehydrohalogenation

    • Substitution

      • Alkynyl anion synthesis




    Substitution

    Substitution

    Alkynyl Anion Synthesis of Alkynes via Bimolecular Nucleophilic Substitution


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