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These previously uncharacterized acid sulfuric anhydride products are almost certainly key contributors to atmospheric new particle formation and a way to efficiently incorporate carboxylic acids into atmospheric nanoparticles.

The connection can be made because compounds known as anhydrides and esters serve as electronically favourable dienophiles in Diels–Alder reactions, and can then be converted into acids to take part in various RCC reactions.

Gradually, water vapour from the air hydrolysed the polymer’s anhydride groups, causing decomposition of the film.

In the old chemistry the name acid was applied to the oxides of the negative or nonmetallic elements, now sometimes called anhydrides.

By long heating the acid is converted into its anhydride, which, however, is obtained more readily by heating the silver salt of the acid with acetyl chloride.