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Reactions of Alkenes/ ynes

greater reactivity than alkanes undergo addition reaction – across the dbl bond so no H needs to be removed !!! ENE/YNE has no SUB RXN!!!!. Reactions of Alkenes/ ynes. Types of Addition. 1) Halogenation (Br 2 Cl 2 …) - room temperature (unlike alkanes). 2) Hydrogenation (H 2 )

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Reactions of Alkenes/ ynes

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  1. greater reactivitythan alkanes • undergo addition reaction – across the dblbond so no H needs to be removed • !!!ENE/YNE has no SUB RXN!!!! Reactions of Alkenes/ynes

  2. Types of Addition 1) Halogenation (Br2Cl2 …) - room temperature (unlike alkanes) 2) Hydrogenation (H2) - catalyst (Pt), heat, pressure) **3) Hydrohalogenation (HBr, HCl) - room temperature • **4) Hydration (H2O) • conc. acid catalyst (H2SO4) • **Markovnikov’s Rule for unsymmetrical additions (p26): • the H will be added to the C with the most H’s to begin with

  3. 1) Halogenation (________) - room temperature (unlike alkanes) rm. Temp. + Br2 (g) 1-propene 1,2-dibromopropane NOTE: ONLY 1 PRODUCT – like a synthesis reaction!!!!!!!!!!

  4. 2) Hydrogenation (_____) - catalyst (Pt), heat, pressure) Pt cat. Heat pressure +H2(g) propane

  5. **3) Hydrohalogenation(______) - room temperature rm. Temp. + HBr(g) 2-bromopropane + **Markovnikov’s Rule for unsymmetrical additions (p26): the H will be added to the C with the most H’s to begin with 1-bromopropane

  6. **4) Hydration (______) • conc. acid catalyst (H2SO4) conc. H2SO4 2-propanol + + H2O 1-propanol

  7. CAUTION WITH TPL BONDS! - cis/trans products are possible if only reducing to a dbl bond Pt cat. heat pressure + H2 cis-2-butene + trans-2-butene

  8. XS with TPL BONDS! Pt cat. heat pressure + H2 (xs) butane

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