Bis-acenaphthyls

Significant shortcomings of such a technique for the preparation of 4,4 -keto-bis(naphthalic anhydride) are low yields of bis-acenaphthyls (4,4 -diacenaphthylmethane-15% 4,4 -diacenaphthyl ketone-5 %) and work with phosgene and carbon disulfide. 

This bisfnaphthalic anhydride) was prepared from acenaphthene derivative-4,4 -diacenaphthyl sulfone, which was synthesized by the interaction of acenaphthene with a mixture of dimethybulfate and sulfuric anhydride [94] or chlorosulfonic acid [95]. Sulfone-bis-(4,5-dicarboxynaphthyl l) dianhydride results from oxidation of bis-acenaphthyl with potassium permanganate in pyridine [94] ... 

Its isomer 2,2 -sulfone-bi naphthalic anhydride) resulted from sulfonation of acenaphthene with chlorosulfonic acid at 125-130 °C and subsequent oxidation of the obtained bis-(acenaphthyl)-sulfone with chromium anhydride [95] ... 

Another important group of bis(naphthalic anhydrides) - the so called bis(ketonaphthalic anhydrides) - was formed by the Fri lel-Crafts reaction between aromatic dicarboxylic acids dichlorides and two-fold molar amounts of acenaphthene and subsequent oxidation of tte obtained bis-acenaphthyls to bis(ketonaphthalic anhydrides) [111-115] according to heme 24. 

Oxidation of bis-acenaphthyls Interaction of bis-fo-phenyl-enediamine) with 4-(phenyl glyoxalyl) naphthalic anhydride... 

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