Answer :
A method of for preparing this alkene using a Grignard reagent OR a Wittig reagent, you would start with a compound containing a halogen (such as bromine or iodine) attached to a carbon atom.
The Grignard reagent, which is an organomagnesium compound, is prepared by reacting magnesium metal with an alkyl or aryl halide, this forms a nucleophilic carbon-metal bond. Once you have the Grignard reagent, you can add it to a carbonyl compound, such as an aldehyde or ketone, in a reaction known as the Grignard reaction. The carbon atom of the carbonyl compound forms a new bond with the carbon atom of the Grignard reagent, displacing the oxygen atom. This results in the formation of the desired alkene.
On the other hand, to prepare the alkene using a Wittig reagent, you would start with a compound containing a carbonyl group, such as an aldehyde or ketone. The Wittig reagent, which is an ylide, is prepared by reacting a phosphonium salt with a strong base, such as sodium hydride. When the Wittig reagent is added to the carbonyl compound in a Wittig reaction, a new carbon-carbon double bond is formed between the carbon atom of the carbonyl group and the carbon atom of the Wittig reagent. This results in the formation of the desired alkene.
In summary, the Grignard reagent and Wittig reagent are both useful methods for preparing alkenes from different starting compounds. The Grignard reagent reacts with a halogenated compound, while the Wittig reagent reacts with a carbonyl compound. These reactions allow for the formation of new carbon-carbon double bonds and the synthesis of alkenes.
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