Condensation of 4‐bromo‐ (4) and 4‐nilro‐l,8‐naphthalimides (5) with 2‐aminobenzenethiol gave 4‐(2‐aminoulicnylthio)‐1,8‐naphthalimides (7). Cyclisalion of 7 by the: Pschorr reaction afforded benzo[k,l] thioxanthene‐3,4‐dicarboximides (8), also obtained by reaction ol amities with benzo[k,l] thioxanthene‐3,4‐dicarboxylie anhydride (11).

No abstract

The effect on colour resulting from substitution in the phenyl and naphthyl rings of 7H‐benzimidazo [2,1‐a]benz[de]isoquinolin‐7‐one (I) is discussed; dycing and fastness properties of these dyes on synthetic fibres are described and the synthesis of some new 1,8‐naphthalimides and derivatives of I recorded.

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