Question

Question: What dicarbonyl compound is needed to prepare each compound by an intramolecular aldol reaction?

Short answer

Answer

Step-by-step solution

Detect the α and β carbons

The $\alpha and\beta$ carbon bond is cleaved to open the ring.

Addition to the α and β-carbons

Upon cleavage, the $\mathit{\alpha }$-carbon is added with a hydrogen atom. However, the $\mathit{\beta }$-carbon is converted into a carbonyl group$\left(C=O\right)$ , and the tetravalency of the carbon is satisfied with the hydrogen atom.

Product of the given reaction

a. The starting materials of the product are detected hereunder.

Starting materials of a.

b. The starting materials of the product are detected hereunder.

Starting materials of b.

c. The starting materials of the product are detected hereunder.

Starting materials of c.

d. The starting materials of the product are detected hereunder.

Starting materials of d.