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Dependence of 1H NMR chemical shifts of geminal protons of glycosyloxy methylene (H2-26) on the orientation of the 27-methyl group of furostane-type steroidal saponins

โœ Scribed by Pawan K. Agrawal


Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
96 KB
Volume
42
Category
Article
ISSN
0749-1581

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Introduction of a fluorine substituent into an aromatic ring of [2.2]paracyclophane causes distinct shielding and deshielding effects at the anti -and syn-protons, respectively, of the adjacent bridge methylene group. A recent contradictory claim in the literature was disproved by 2D H,H-NOESY, long