Abstract
A systematic and general account of the literature data on the methods of synthesising tetracarboxylic acids capable of forming internal cyclic dianhydrides is given for the first time in the present review. These products have found extensive applications as starting materials for the synthesis of heterocyclic polymers, dyes, plasticisers, hardening agents for epoxy-resins, etc. Particular attention has been devoted to methods of synthesising aromatic tetracarboxylic acids and also products of greatest practical importance.
The bibliography includes 214 references.