83990-15-2

Upstream product

• 85-44-9 phthalic anhydride 
• 13755-95-8 2,3-diamino-1,4-naphthoquinone 
• 1074-82-4 potassium phtalimide 
• 5397-78-4 2-acetamido-3-chloro-1,4-naphthoquinone 
• 83990-16-3 2-acetylamino-3-phthalimido-1,4-naphthoquinone 
• 83990-12-9 2-amino-3-phthalimido-1,4-naphthoquinone 
• 83990-13-0 2-(2-carboxyphenyl)-1H-naphtho<2,3-d>imidazole-4,9-dione 

Relevant academic research and scientific papers

INVESTIGATION IN THE REGION OF 1,4-NAPHTHOQUINONE. VII. REACTION OF 2,3-DIAMINO-1,4-NAPHTHOQUINONE WITH PHTHALIC ANHYDRIDE

Depending on the temperature, the reaction of 2,3-diamino-1,4-naphthoquinone with phthalic anhydride leads to the successive formation of 2-amino-3-(2-carboxybenzoylamino)- and 2-amino-3-phthalimido-1,4-naphthoquinone, which are converted in an alcohol-water solution of alkali into 2-(2-carboxyphenyl)-1H-naphthoimidazole-4,9-dione.The latter readily undergoes cyclization to 1,2-benzoylenenaphthoimidazole-4,9-dione.