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14.4.10.2.2 Method 2: Oxidation of 1,2,3,4-Tetrahydro-9H-xanthen-9-ones Using Sulfur

DOI: 10.1055/sos-SD-014-00294

Williams, A. C.; Camp, N.Science of Synthesis, (200314607.

Dehydrogenation of 2-methoxy-1,2,3,4-tetrahydro-9H-xanthen-9-one is also achieved using elemental sulfur at 210240°C (Scheme 274). In this case, no solvent is used and the brown reaction mixture is purified by chromatography with alumina to give 2-methoxy-9H-xanthen-9-one (692) in 58% yield.[‌1046‌]

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