Tetrachloro-p-hydroquinone → 1,4-Bis(3,4-dicyanotrifluorophenoxy)tetrachlorobenzene

Beteiligte Stoffe

Reaktionsschritte

The objective 1,4-bis(3,4-dicarboxytrifluorophenoxy)tetrachlorobenzene dianhydride is produced as an embodiment by reacting tetrafluorophthalonitrile and tetrachlorohydroquinone (or its metal salts such as 2 Na salt; it is summarized as “tetrachlorohydroquinone”) in the presence of a base in a solvent at a temperature of −20° C. to 200° C. for 0.1 to 20 hours to form 1,4-bis(3,4-dicyanotrifluorophenoxy)tetrachlorobenzene (Step 1a); hydrolyzing the resulting 1,4-bis(3,4-dicyanotrifluorophenoxy)tetrachlorobenzene with an acid at a temperature of 50° C. to 300° C. for 0.5 to 20 hours to form 1,4-bis(3,4-dicarboxytrifluorophenoxy)tetrachlorobenzene (Step 1b); dissolving the reaction solution including 1,4-bis(3,4-dicarboxytrifluorophenoxy)tetrachlorobenzene in a medium containing an organic solvent once, purifying and separating the product therefrom (Step 1c); and then dehydrating the separated 1,4-bis(3,4-dicarboxytrifluorophenoxy)tetrachlorobenzene (Step 1d).

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