Bis-Phenoxide Salts

The bis-phenoxide salts were prepared In anhydrous form by azeotropic drying, starting with the bis-phenol and an alkali hydroxide. They were polymerized by displacement... 

However, nitro-N-alkylphthalimides, 7 ("protected" nitro-phthalic anhydrides), when treated with bis-phenoxide salts, 2, underwent smoothe displacement to produce bis ether-bis-imides, 8. These can be readily purified to remove all of the tyT>es of impurities which, in the prior method,... 

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