| 摘要 |
Mixtures of isomers of benzoxanthene and benzothioxanthene dyestuffs of the formulae <IMAGE> +TR <IMAGE> wherein X is oxygen or sulfur, R optionally substituted alkyl, acyl or arylsulfonyl, R1 and R2 are hydrogen or halogen, alkyl, aryl, acyl, acyloxy, carbalkoxy, alkoxy, nitro, alkylthio or alkylsulfonyl or they form together a condensed benzene ring, R3 and R4 are hydrogen or halogen, alkyl, alkoxy, aryl, carbalkoxy or nitrile, R5 and R6 are hydrogen or optionally substituted alkoxy, are obtained by condensing the corresponding benzoxanthene or benzothioxanthene-3,4-carboxylic acid anhydrides or esters with phenyl acetic acid anhydrides or esters in the presence of alkali at a temperature of about 150 DEG to 260 DEG C. and alkylating or acylating the so-obtained hydroxy intermediates without previous isolation thereof when condensation and alkylation or acylation are performed in a polar organic solvent.
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