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Core - Organic Chemistry

    Chapter 9

    Alkynes

    9.1 : Structure and Physical Properties of Alkynes02:37

    9.1 : Structure and Physical Properties of Alkynes

    Introduction: In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose ...

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    9.2 : Nomenclature of Alkynes02:39

    9.2 : Nomenclature of Alkynes

    Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of ...

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    9.3 : Acidity of 1-Alkynes02:42

    9.3 : Acidity of 1-Alkynes

    The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa ...

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    9.4 : Preparation of Alkynes: Alkylation Reaction02:27

    9.4 : Preparation of Alkynes: Alkylation Reaction

    Introduction Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for ...

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    9.5 : Preparation of Alkynes: Dehydrohalogenation02:34

    9.5 : Preparation of Alkynes: Dehydrohalogenation

    Introduction Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ...

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    9.6 : Electrophilic Addition to Alkynes: Halogenation02:38

    9.6 : Electrophilic Addition to Alkynes: Halogenation

    Introduction Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the ...

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    9.7 : Electrophilic Addition to Alkynes: Hydrohalogenation02:35

    9.7 : Electrophilic Addition to Alkynes: Hydrohalogenation

    Electrophilic addition of hydrogen halides, HX (X = Cl, Br or I) to alkenes forms alkyl halides as per Markovnikov's rule, where the hydrogen gets ...

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    9.8 : Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration02:40

    9.8 : Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration

    Introduction Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of ...

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    9.9 : Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

    9.9 : Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

    Introduction One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is ...

    17.8K views
    9.10 : Alkynes to Carboxylic Acids: Oxidative Cleavage02:01

    9.10 : Alkynes to Carboxylic Acids: Oxidative Cleavage

    Alkynes undergo oxidative cleavage in the presence of oxidizing reagents like potassium permanganate and ozone. The triple bond — one σ bond ...

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    9.11 : Reduction of Alkynes to <em>cis</em>-Alkenes: Catalytic Hydrogenation02:24

    9.11 : Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

    Introduction Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves ...

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    9.12 : Reduction of Alkynes to <em>trans</em>-Alkenes: Sodium in Liquid Ammonia02:10

    9.12 : Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia

    Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an ...

    9.1K views
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