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Cage-shaped cyclobutanoic dianhydrides and process for production thereof
A process which comprises reacting a 1,2,3,4-cyclobutanetetracarboxylic-1,2:3,4-dianhydride  with an alcohol  in the presence of an acid catalyst to obtain a compound , isomerizing the compound  with a base catalyst into a compound , reacting the compound  with an organic acid to obtain a compound , and reacting the compound  with a dehydrating agent to obtain a 1,2,3,4-cyclobutanetetracarboxylic-1,3:2,4-dianhydride: wherein R1 and R2 are each independently hydrogen, halogeno, alkyl of 1 to 10 carbon atoms, halogenated alkyl of 1 to 10 carbon atoms, cycloalkyl of 3 to 8 carbon atoms, phenyl, or cyano; and R3 is alkyl of 1 to 10 carbon atoms.
Filed on: 2005-10-18; Application Number: 11665024