摘要：

Valuable benzoxanthene and benzothioxanthene dyestuffs of the general formula ##SPC1## In which X represents an oxygen or sulfur atom, Y represents ##SPC2## Groups, wherein R stands for a hydrogen atom or an alkyl, cycloalkyl or aryl group which may be substituted, a heterocyclic radical, a hydroxyl or amino group, R 1 and R 2 each represent hydrogen atoms, halogen atoms, especially chlorine or bromine atoms, alkyl or alkoxy groups, and n stands for a number of 1 to 3, which dyestuffs are suitable for dyeing and printing of plastic materials and excellently suitable as fluorescing dyestuffs in the dyeing of condensation resins which when dyed are distinguished by excellent fastness to bleeding and good fastness to light.

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