Question

Which of the follwing would help accomplish the following conversion in a single step:

• A. Dissolved metal reduction
• B. Catalytic hydrogenation with Pt
• C. Catalytic hydrogenation with Lindlar Pd/C
• D. Catalytic hydrogenation with Raney Nickel

Answer 1

Answer: (C)

Catalytic hydrogenation with Lindlar Pd/C

Observe that the substrate has a triple bond between carbons 2 and 3 which becomes a cis configuration double bond in the product.
Also, there is the small aspect of a hydroxyl acid becoming a lactone.