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Kapitel 9

Alkine

Struktur und physikalische Eigenschaften von Alkinen
Struktur und physikalische Eigenschaften von Alkinen
Introduction: In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose ...
Nomenklatur der Alkine
Nomenklatur der Alkine
Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of ...
Säuregehalt von 1-Alkinen
Säuregehalt von 1-Alkinen
The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa ...
Herstellung von Alkinen: Alkylierungsreaktion
Herstellung von Alkinen: Alkylierungsreaktion
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 ...
Herstellung von Alkinen: Dehydrohalogenierung
Herstellung von Alkinen: Dehydrohalogenierung
Introduction Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ...
Elektrophile Zugabe zu Alkinen: Halogenierung
Elektrophile Zugabe zu Alkinen: Halogenierung
Introduction Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the ...
Elektrophile Zugabe zu Alkinen: Hydrohalogenierung
Elektrophile Zugabe zu Alkinen: Hydrohalogenierung
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 ...
Alkine zu Aldehyden und Ketonen: Säurekatalysierte Hydratation
Alkine zu Aldehyden und Ketonen: Säurekatalysierte Hydratation
Introduction Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of ...
Alkine zu Aldehyden und Ketonen: Hydroborierung-Oxidation
Alkine zu Aldehyden und Ketonen: Hydroborierung-Oxidation
Introduction One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is ...
Alkine zu Carbonsäuren: Oxidative Spaltung
Alkine zu Carbonsäuren: Oxidative Spaltung
Alkynes undergo oxidative cleavage in the presence of oxidizing reagents like potassium permanganate and ozone. The triple bond — one σ bond ...
Reduktion von Alkinen zu cis-Alkenen: Katalytische Hydrierung <em></em>
Reduktion von Alkinen zu cis-Alkenen: Katalytische Hydrierung
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 ...
Reduktion von Alkinen zu trans-Alkenen: Natrium in flüssigem Ammoniak <em></em>
Reduktion von Alkinen zu trans-Alkenen: Natrium in flüssigem Ammoniak
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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