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- W1987147404 abstract "Naphtho[1,2-b][1]benzothiophene-6-carboxylic acids, 6H-benzo[b]naphtho[2,3-d]thiopyran-6-ones and 6H-benzo[b]naphtho[2,3-d]pyran-6-ones were synthesized in one step by the photocyclization reaction of 3-aryl-2-([1]benzothien-3-yl)propenoic acids. The photocyclization reaction did not occur when the 3-aryl group contained the electron-withdrawing nitro group. The assignment of the 1H and 13C nmr spectra of 6H-benzo[b]naphtho[2,3-d]thiopyran-6-one and 6H-benzo[b]naphtho[2,3-d]pyran-6-one by two-dimensional nmr methods is described. The difference between the chemical shift values of H12 for these two compounds is attributed to different molecular geometries." @default.
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- W1987147404 date "2000-07-01" @default.
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- W1987147404 title "Syntheses of thiopyrone and pyrone derivatives by photocyclization reaction of 3-aryl-2-( Benzothien-3-yl)propenoic acids" @default.
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- W1987147404 doi "https://doi.org/10.1002/jhet.5570370446" @default.
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