Formation of cyclic anhydride

[oceanblue5841]

Hey guys, I ran into a problem on destroyer, were a cyclicanhydride is formed, I know a carboxylic acid under heat can form anhydride, but the reagent on this problem was just labeled as D does D stand for heat?

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[invictusx]

Hey guys, I ran into a problem on destroyer, were a cyclicanhydride is formed, I know a carboxylic acid under heat can form anhydride, but the reagent on this problem was just labeled as D does D stand for heat?

Can you link us a picture?