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Answer “Provide the alkyne starting material A, intermediate organic product B, and identify the reagents”

Concepts and reason

The given product and the set of reagents can be used to predict the intermediate organic product B. The set of reagents can also be used to predict the starting material that will allow B to be formed.

Fundamentals

Retrosynthesis is the art of anticipating the reactants to a reaction with the given products.

Chemical reactions involve the breaking down of bonds and creating new bonds. Retrosynthesis involves the removal of bonds from the product to make stable reactants. If the product is a Cyclopropane Ring, it can have been made from an α, β unsaturated compound by ylide reactions, or an alkene-by Simmons-Smith reaction.

A lactone can also be made by intramolecular condensation between an acid group and an aldeh group, or Baeyer-Villiger oxygenation of a ketones.

Answer:

Cyclopropane ring can be formed from an alkene by the Simmons-Smith reaction as follows:

An E alkene can easily be formed by reduction of an alkyne as follows:

Last words

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