Petra Schrick, Klaus Geick, S. Waldvogel
Jul 1, 2008
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Journal
Synthesis
Abstract
2,6,7-Trihydroxyxanthen-3-ones are reliably prepared by a one-pot protocol using alkali peroxosulfates in the key step. NMR spectra in deuterated sodium hydroxide confirm the anticipated structures and allow the determination of the dye contents by an internal standard.