Synthesis of certain bis(phthalic anhydrides)

Details Synthesis of certain bis(phthalic anhydrides) Synthesis of certain bis(phthalic anhydrides)

1971-02-08

1976-06-22

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260251R, 260152, 260287R, C07D30789

Patent

active

039651258

ABSTRACT:
Monomeric high molecular weight dianhydrides or tetraacids can be produced by the nucleophilic coupling of a halo substituted phthalimides acid and an aliphatic or aromatic compound having polyfunctional groups capable of reacting with the halo moiety of the phthalinide followed by hydrolysis and dehydration. Specifically, 4-chlorophthalate sodium salt is converted to an imide to reduce side reactions with the carboxylic acid groups prior to reaction with 4,4'-disodiumdiphenylene oxide sulfone or 2,2-di (4-sodium phenoxide) propane. After the reaction of the imide and the sulfone or propane compounds, the diimide formed is converted to the corresponding dianhydride.

REFERENCES:
patent: 3431240 (1969-03-01), Vogel et al.

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