Synthesis and Absorption Properties of Some 4-Mercapto-1,8-naphthalimides, 4-Mercapto-7H-benzimidazo[2,1-a]benz[d,e] Isoquinolin-7-one, and 4-Mercapto-7H-benzimidazo [2,1-a]Benz[d, e]isoquinoline-7-one

The reaction of 4-chloro-1,8-naphthalic anhydride with sulfur and sodium sulfide in boiling ethanol lead to 4-mercapto-1,8-naphthalic anhydride. The condensation of a later compound with amines produced 4-mercapto-1,8-naphthalimides and with ethylenediamine and orthophenylenediamine, respectively, led to 4-mercapto-7H-imidazo[2,1-a]benz[d,e]isoquinoline-7-one and 4-mercapto-7H-imidazo[2,1a]benz[d,e]isoquinoline-7-one in good to fairly high yields.

Keywords:

• 4-Chloro-1,8-naphthalic anhydrides
• 4-mercapto-1,8-naphthalimides
• ethylendiamine
• orthophenylendiamine