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Solvent shifts of proton resonances induced by benzene and pyridine in epoxides and ethers. An aid to structure elucidation

✍ Scribed by Williams, Dudley Howard; Ronayne, J.; Moore, Harold Wesley; Shelden, H. Raymond

Book ID: 126077095
Publisher: American Chemical Society
Year: 1968
Tongue: English
Weight: 608 KB
Volume: 33
Category: Article
ISSN: 0022-3263
DOI: 10.1021/jo01267a012

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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