Solvent-induced shifts in NMR spectrosco
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Hirday N. Jha; Virinder S. Parmar
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Article
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1983
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Elsevier Science
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English
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We have observed that the benzene-induced solvent shifts ofcertain methoxyl groups in the NMR spectra of isoflavones are appreciably changed by the addition of a small amount of trifluoroacetic acid to the solution of the isoflavones in a 1: 1 mixture of chloroform and benzene. The methoxyl group at