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- W2023744543 abstract "The high-resolution 13C solid-state NMR spectra of naphthazarin polymorphs and some of its derivatives having methyl substituents are discussed. Differences observed between the spectra of the A and B forms and that of the C modification of naphthazarin are explained by invoking hydrogen-bonding effects. The 2-methyl and 2,3-dimethyl derivatives show spectra consistent with their x-ray-determined structure as being mainly composed of the tautomer bearing the substituents on the quinonoid ring. The 2,7-dimethyl-substituted compound undergoes a fast intramolecular proton migration at room temperature between tautomers present in nearly equal amounts." @default.
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- W2023744543 date "1990-02-01" @default.
- W2023744543 modified "2023-10-16" @default.
- W2023744543 title "13C CP-MAS study of the polymorphs of naphthazarin and of some methyl derivatives" @default.
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- W2023744543 doi "https://doi.org/10.1002/mrc.1260280206" @default.
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