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Tetramethoxy-3-phenylcoumarin

The combination of the fragments A-C completes the structure and shows the compound to be 3, 4, 7,8-tetramethoxyisoflavone, D. [Pg.217]

Isoflavones 3 that are unsubstituted in the 2-position are characterised in their H and C NMR spectra by two features  [Pg.217]

The NMR spectra of the product do not show these features. The highest C shift value is Sc = 160.9 and indicates a conjugated carboxy-C atom instead of the keto carbonyl function of an isoflavone (5c =175). On the other hand, a deshielded CH fragment at 5c/ 5 = 138.7/7.i52 appears in the C NMR spectrum, which belongs to a CC double bond polarised by a -A/effect. The two together point to a coumarin 4 with the substitution pattern defined by the reagents. [Pg.217]

Partial Proton carbon atom carbon atoms [Pg.218]

Structure Sh attached Sc in two or three (or four) bonds distance Sc [Pg.218]

See other pages where Tetramethoxy-3-phenylcoumarin is mentioned: [Pg.217]    [Pg.217]    [Pg.217]    [Pg.217]    [Pg.217]    [Pg.139]    [Pg.172]    [Pg.217]    [Pg.217]    [Pg.217]    [Pg.217]    [Pg.217]    [Pg.217]    [Pg.217]    [Pg.217]    [Pg.217]    [Pg.139]    [Pg.172]    [Pg.217]    [Pg.217]    [Pg.217]    [Pg.217]   


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4- phenylcoumarin

Tetramethoxy

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