imidazo (1.5 a) pyridyl methane and imidazo (1.5 - (b) pyridazinyl methane derivatives, their production and aufzeichnungsmaterialien containing.

摘要

Hetarylmethane leuco dyestuffs of the formula IMAGE (I) wherein R denotes halogen, alkyl, alkoxy, aryl or aryloxy, A denotes an aromatic-carbocyclic or -hetero-cyclic radical, B denotes hydrogen, halogen, alkyl, aryl, alkylcarbonyl, arylcarbonyl, amino, monoalkylamino, dialkylamino, arylamino, aralkylamino or acylamino, X denotes CH or N, Y denotes IMAGE +TR IMAGE R6 denotes hydrogen or alkyl, m denotes 4-6 and n denotes O and 1-4 and wherein the cyclic and acyclic radicals in turn can be substituted by nonionic radicals, are used as color formers in pressure-copyable and thermoreactive recording materials.