4-Chloroformyl naphthalic anhydrides

Chloroformyl(naphthalic anhydride), a derivative of naphthalene-1,4,5-tricarboxylic acid, and the acid itself were involved in preparing bis(naphthalic anhydrides) containing ester and amide groups (Scheme 26) ... 

Thus, condensation of aromatic bis-phenols with two-foid molar amounts of 4-chloroformyl(naphthalic anhydride) in organic solvents in the presence of bases yielded bisfesteranaphthalic anhydrides). Scheme 27 [120]. 

Condensation of 4-chloroformyl (naphthalic anhydride) with resotcine 95 120... 

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. 

Involvement of 4-chloroformyl(naphthalic anhydride) in preparing monomers with phenyl-substituted heterocyclic fragments proves to be correct. Thus, bis[l-phenyI-2(4,5-dicarboxynaphthyl) benzimidazoIe-5-yl]-sulfone dianhydride was obtained by treating bis [(3-amino-4-phenylamino)-phenyl]sulfone -a product based on commercial 4,4 -dichlorodiphenyl-sulfone with a two-fold molar amount of 4-chloroformyl(naphthalic anhydride) and subsequent cyclo-dehydration of the compound prepared [124, 125]. 

Carbon-carbon, free radical initiators 91-94 Cardo amines 210 Cellulosic surfactants 53 4-Chloroformyl(naphthalic anhydrides) 129-132... 

---