There is only one alkyne that forms an aldehyde when it undergoes either acid- or mercuric-ion-c

step 1 In this problem, we're asked to identify the only alkyne that forms an alvehyde that is a termin

There is only one alkyne that forms an aldehyde when it...

Key Concepts

Alkynes

Alkynes are hydrocarbons that contain at least one carbon–carbon triple bond. Their structure leads to unique reactivity patterns, especially in addition reactions where the triple bond can interact with various reagents, making them key substrates in organic synthesis.

Acid?Catalyzed Hydration

Acid?catalyzed hydration is a reaction mechanism in which water is added across a multiple bond in the presence of an acid catalyst. This process typically involves the formation of a protonated intermediate, followed by the addition of water to form an enol, which subsequently tautomerizes into a more stable carbonyl compound.

Markovnikov’s Rule

Markovnikov’s rule is a principle used to predict the regiochemistry of addition reactions. It states that in the addition of a protic acid to an unsymmetrical alkene or alkyne, the hydrogen atom will attach to the carbon with more hydrogen substituents, while the other component (such as –OH) attaches to the more substituted carbon. This rule helps determine the major product in such reactions.

Tautomerization

Tautomerization is the chemical process where a compound, typically an enol, rearranges to form a more stable isomer known as a keto form. This process is crucial in hydration reactions of alkynes, as the initially formed enol intermediate rapidly converts to a carbonyl compound, such as an aldehyde or ketone.

Terminal Alkynes

Terminal alkynes are alkynes in which the triple bond is located at the end of the carbon chain, meaning one of the involved carbons is bonded to a hydrogen atom. Their unique electronic structure impacts the outcome of addition reactions, often leading to different product distributions compared to internal alkynes. In specific hydration reactions, the presence of a terminal hydrogen can favor the formation of aldehydes over ketones.

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