Abstract
Condensation of 4-( 4-methoxyphenyl)-5H- pyran-2,6-dione ( 1) and 1,2-diaminobenzene ( 2) gave 3-( 4-methoxyphenyl)- 1-oxo-1H, 5H- pyrido [ 1,2-a] benzimidazole ( 3). When 3 was coupled with an aryldiazonium salt two isomeric dyes were obtained in equal proportions. These dyes were characterised as 3-( 4-methoxyphenyl)- 4-( arylthydrazono)- 1-oxo-1H- pyrido-[ 1,2-a] benzimidazole ( 4) and 2-( arylhydrazono)- 3-( 4-methoxyphenyl)- 1-oxo-1H- pyrido[ 1,2-a] benzimidazole ( 5) on the basis of spectral data. Their structures were confirmed also by an alternative synthetic route.
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