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17O NMR spectroscopic study of substituted 9-fluorenones

✍ Scribed by D. W. Boykin; Barbara Nowak-Wydra

Publisher: John Wiley and Sons
Year: 1991
Tongue: English
Weight: 372 KB
Volume: 29
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260290211

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✦ Synopsis

The '"0 NMR chemical shift data for 23 9-fluorenones in acetonitrile at 75OC are reported. '"0 NMR data for the kubstituted 9-fluorenones are correlated with '"0 NMR data for 4-substituted acetophenones. Chemical shift data for 1-halogen*9-fluorenones are deshielded relative to the fisomers, suggesting important repulsive van der Waals interactions. The keto carbonyl signal for 9-fluorenone-lcarboxylic acid is substantially shielded, as expected, from intramolecular hydrogen bonding. The data for several multi-substituted 9-fluorenones demonstrate that substituent effects are additive for the 9-fluorenones.

KJY WORDS

' 0 NMR chemical shifts 9-Fluorenones

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