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Chapter 9

Alkynes

Structure and Physical Properties of Alkynes
Structure and Physical Properties of Alkynes
Introduction: In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose ...
Nomenclature of Alkynes
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 ...
Acidity of 1-Alkynes
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 ...
Preparation of Alkynes: Alkylation Reaction
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 ...
Preparation of Alkynes: Dehydrohalogenation
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 ...
Electrophilic Addition to Alkynes: Halogenation
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 ...
Electrophilic Addition to Alkynes: Hydrohalogenation
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 ...
Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration
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 ...
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
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 ...
Alkynes to Carboxylic Acids: Oxidative Cleavage
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 ...
Reduction of Alkynes to <em>cis</em>-Alkenes: Catalytic Hydrogenation
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 ...
Reduction of Alkynes to <em>trans</em>-Alkenes: Sodium in Liquid Ammonia
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 ...
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