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24
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13444258858
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note
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1H NMR spectra. The IR and mass spectral data also agreed well with the structures.
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25
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13444278053
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note
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Examples of preparing 6H-pyran-3-ones from aldehydes and ketones are scarce. In one example, a pyranone having the same skeleton as the ones reported in this work has been synthesized from a methyl ketone via a multistep sequence (ref 4b).
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26
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13444284243
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note
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Capture of the electrophilic vinyl carbonium ion formed after complexation with Hg(II) by a neighboring sulfur (ref 2a) as well as oxygen atoms (refs 1, 2a, 2b, and 2g) is well precedented. In some of these instances, a substituent attached to the heteroatom is cleaved in the next step, affording sulfur and oxygen heterocycles.
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