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DOI: 10.1055/sos-SD-014-00294

Williams, A. C.; Camp, N.Science of Synthesis, (200314377.

Methanesulfonic acid is used for the formation of 7-hydroxy-2H-1-benzopyran-2-ones 85, trifluoromethanesulfonic acid is used for the formation of 5,7-dihydroxy-4-propyl-2H-1-benzopyran-2-one (86, R1=Pr), and 4-toluenesulfonic acid is used for the formation of 5,7-dihydroxy-4-phenyl-2H-1-benzopyran-2-one (86, R1=Ph) (Scheme 27).

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