What are the complete, acid-catalyzed hydrolysis products (with application of heat) of diphenyl malonate?
According to me, they are phenol, carbon dioxide, and acetic acid.
The aqueous acid and heat conditions indicate to me that we are returning from the carboxylic acid derivative (ester) to the carboxylic acid. The mechanism involves protonation of the carbonyl oxygen and nucleophilic attack by water. This ejects alcohol (well, in this case, phenol).
The heat induces the malonic acid intermediate to decarboxylate and this results in the production of carbon dioxide and acetic acid.
Is my analysis correct?