Question

What starting material gives 5-and 6-membered rings through aldol cyclizations?

• A. Alpha, beta-unsaturated aldehydes
• B. 1,4- and 1,5- diketones
• C. Diamides of dicarboxylic acid
• D. Esters of dicarboxylic acid

Answer 1

The correct option is B 1,4- and 1,5- diketones

$\begin{array}{c}\text{so,}1,4\text{and}1,5\text{-diketones give}5\text{and}6-\text{membered rings}\\ \text{through aldol cyclizations.}\\ \text{This, option (B) is correct.}\end{array}$