Reliable Synthesis of 9-Aryl-Substituted 2,6,7-Trihydroxyxanthen-3-ones
作者:Siegfried Waldvogel、Petra Schrick、Klaus Geick
DOI:10.1055/s-2008-1078447
日期:2008.7
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.
Protolytic equilibria of p-methoxycarbonylphenyl fluorone (PMCPF) in aqueous solutions were studied by spectrophotometry, and the species of PMCPF were determined. We describe for the first time the X-ray structure of the proton acceptor form of PMCPF.