Dicarboxylic anhydrides are chemical compounds formed from dicarboxylic acids by the removal of water between two carboxyl groups. They typically have a cyclic structure and are used in various industrial applications, including the production of polymers and resins. Common examples include phthalic anhydride and maleic anhydride. These anhydrides are reactive and can undergo hydrolysis to regenerate the corresponding dicarboxylic acids. They are important intermediates in organic synthesis and can participate in reactions with alcohols, amines, and other nucleophiles, making them valuable in the manufacture of dyes, coatings, and pharmaceuticals.