Oxadiazoles, aromaticity ring syntheses

In this connection, employment of 4-chloroformyl(naphthalic anhydride) in synthesis of bis(naphthalic anhydrides) containing various aromatic heterocycles seems to be more preferable. In particular, bisfnaphthalic anhydrides) with 1,3,4-oxadiazole and benzoxazole rings were synthesized within the framework of investigation [123], Scheme 29. 

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