## Abstract ^13^C NMR chemical shifts and ^13^Cο£Ώ^31^P couplings are reported for triphenyl phosphate and 13 alkyl derivatives. In __ortho__βalkylated materials, it is found that the upfield Ξ³ shielding effect is only operative when the carbon atom, situated Ξ³ to the exocyclic oxygen, bears at least
β¦ LIBER β¦
Carbon-13 nuclear magnetic resonance of the group V triphenyls and of triphenylphosphinemolybdenum pentacarbonyl
β Scribed by Gansow, O. A.; Kimura, Bert Y.
- Book ID
- 120252230
- Publisher
- Royal Society of Chemistry
- Year
- 1970
- Weight
- 182 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0577-6171
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The =C chemical shifts of a series of isoflavones having hydroxy, acetoxy, methoxy and methylenedioxy substituents are compared. Some general relationships between substitution patterns and chemical shifts, useful for the identitication of naturally occurring isoflavones, are outlined.