Reliable synthesis of 9-aryl-substituted 2,6,7-trihydroxyxanthen-3-ones.

[摘要]：2,6,7-Trihydroxyxanthen-3-ones are reliably prepd. by a one-pot protocol from 1,2,4-(AcO)3C6H3 and arom. aldehydes using alkali peroxosulfates in the key step. NMR spectra in NaOD confirm the anticipated structures and allow the detn. of the dye contents by an internal std.

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