Stability of Alkenes

 Stability of Alkenes

There are two factors for determining the stability of alkenes

Preparation of Alkene Part 4

 Wittig Reaction

The Wittig Reaction is a very useful method for the synthesis of alkenes. In this reaction, aldehydes and ketones react with phosphorus ylides to form alkenes.

Preparation of Alkene part 3

 Cope Reaction

When tertiary amine oxides are heated to about 150°C, they undergo thermal elimination to form alkenes. This reaction is known as the Cope Reaction.

Preparation of Alkenes Part 2

 Pyrolytic Eliminations

Pyrolytic elimination reactions are those in which the elimination occurs through heating and involves a cyclic transition state. These reactions occur without requiring the addition of external reagents like acids or bases. Instead, the heat provides the necessary energy to facilitate the elimination.

Preparation of Alkenes

Preparation of Alkenes

1. Dehydrohalogenation of alkyl halides:

Alkenes can be prepared by the elimination of hydrogen halide from an alkyl halide. Hydrogen and halogen are removed from adjacent carbon atoms, resulting in the introduction of a carbon-carbon double bond in the molecule.

Nomenclature of Alkenes

 Nomenclature of Alkenes

Introduction to Alkenes

 Alkenes

Introduction

Alkenes are hydrocarbons that contain at least one carbon-carbon double bond. They follow the general formula C_nH_2n. A double bond makes them unsaturated and more reactive than alkanes.

Olefins is another name for alkenes, derived from "olefiant gas" (oil-forming gas). This term historically referred to ethene () because it reacts with chlorine to form an oily liquid.