Preparation of citraconic anhydride
AssigneeRhone-Poulenc Chimie
InventorsMichel Alas, Alain Sigismondi, Philippe-Jean Tirel
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Abstract
Citraconic anhydride is prepared in a single step by heating itaconic acid, optionally in an inert organic solvent medium, in the presence of a catalytically effective amount of an at least partially organic acid/base catalyst compound having a pKa ranging from 4 to 10, in particular a salt catalyst such as pyridinium tosylate, itaconate or hydrochloride, ammonium itaconate, or phosphinium hydrobromide.
Claims19
A process for the preparation of citraconic anhydride, comprising heating itaconic acid in the presence of a catalytically effective amount of a catalyst compound, which is a product of an acid with a base with at least one of the two being an organic compound, having a pKa ranging from 4 to 10.
Dependencies are inferred from the claim text.