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

Article abstract of DOI:10.1080/10426500500269497

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 ethylenediam