Process for the preparation of high-purity 5,5'-[2,2,2,-...

Details Process for the preparation of high-purity 5,5'-[2,2,2,-... Process for the preparation of high-purity 5,5'-[2,2,2,-...

C - Chemistry, Metallurgy

07

D

402/221, 260/364

C07D 307/89 (2006.01) C07C 63/72 (2006.01) C08G 73/10 (2006.01)

Patent

CA 1339574

Process for the preparation of high-purity 5,5'-[2,2,2- trifluoro-1-(trifluoromethyl)ethylidene]bis-1,3-isobenzofurandione A process for the preparation of high-purity perfluorinated compounds, specifically of an aromatic tetracarboxylic acid and its anhydride, 5,5'-[2,2,2-trifluoro- 1-(trifluoromethyl)ethylidene] bis-1,3-isobenzofurandione, by a multi-step treatment of the crude compounds. The metal ion content of the compounds treated is reduced considerably. After polymerization with an aromatic diamine, the anhydride is used in microelectronics.

607510

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