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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. Syn reduction of Alkynes to Alkenes

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Alkene Preparation Reactions

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  1. Alkene Preparation Reactions • Alkyne reductions • Syn orientation • Anti orientation • Elimination reactions • Alcohol dehydration • Alkyl halide dehydrohalogenation • Vicinal dihalide dehalogenation

  2. 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

  3. Alkenes via Alkyne Reduction

  4. Alcohol Elimination • E-1 • Unimolecular kinetics • Carbocation intermediates • Skeletal rearrangements possible

  5. Alkenes via Alcohol Dehydration

  6. Dehydrohalogenation of Alkyl Halides Unimolecular versus Bimolecular elimination

  7. BimolecularDehydrohalogenation of Alkyl Halides Periplanar anti-elimination

  8. Dehalogenation of Vicinal Dihalides • E-2 • Bimolecular kinetics • Periplanar Anti-orientation • No skeletal rearrangements possible

  9. E-2 Dehalogenation of Vicinal Dihalides Periplanar anti-elimination

  10. Alkyne Preparation Reactions • Elimination • Vicinal tetrahalide dehalogenation • Vicinal dihalide dehydrohalogenation • Substitution • Alkynyl anion synthesis

  11. Vicinal Tetrahalide Dehalogenation

  12. Vicinal Dihalide Dehydrohalogenation

  13. Substitution Alkynyl Anion Synthesis of Alkynes via Bimolecular Nucleophilic Substitution

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