20. Carboxylic Acid Derivatives:NAS - 4! 3부

22. Carboxylic Acid Derivatives: NAS / Lactones, Lactams and Cyclization Reactions / 문제 6

문제 6

5-hydroxy-3-methylpentanoic acid forms a cyclic ester (lactone) when it is mixed with a trace amount of acid.

(i) Write the structure of the lactone.
(ii) Suggest a plausible mechanism for its formation.

Mechanism illustrating the formation of a lactone from a cyclic structure.

Alternative mechanism for lactone formation with different reaction steps.

Another mechanism diagram showing lactone formation with detailed steps.

Final mechanism diagram for lactone formation with reaction intermediates.

5-hydroxy-3-methylpentanoic acid forms a cyclic ester (lactone) when it is mixed with a trace amount of acid.(i) Write the structure of the lactone.(ii) Suggest a plausible mechanism for its formation.