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A new method for annulation of the ??-pyrone ring
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Chemistry of Heterocyclic Compounds
[DOI: 10.1007/s10593-007-0059-0]
Williams, A. C.; Camp, N., Science of Synthesis, (2003) 14, 441..
Direct Thionation of 2H-1-Benzopyran-2-ones with Phosphorus Pentasulfide
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Science of Synthesis