Heterocyclic derivatives of naphthalene-1,8-dicarboxylic anhydride. Part I. Nitro-7H-benzimidazo[2,1-a]benz[de]isoquinolin-7-ones

摘要: Condensation of o-phenylenediamine with 2-, 3- and 4-nitronaphthalene-1,8-dicarboxylic anhydrides gives, in each case, an isomer mixture. Separation the mixtures into six isomeric mononitro-7H-benzimidazo[2,1-a]benz[de]isoquinolin-7-ones is described isomers characterised respect previously reported data on some isomers; ir mass spectrum are reported, latter showing fragmentation ions which may be used characterising dyes based this chromophore. Other new derivatives 7H-benzimidazo[2,1-a]benz[de]isoquinolin-7-one also described.