Carbon-13 nuclear magnetic resonance spectra of divinyl ethers
β Scribed by Taskinen, Esko
- Book ID
- 126067708
- Publisher
- American Chemical Society
- Year
- 1978
- Tongue
- English
- Weight
- 618 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0022-3263
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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.
## Abstract Carbonβ13 n.m.r. chemical shifts are reported for diphenyl ether and several of its chlorinated analogs. Carbon shieldings were found to be dependent on the degree of steric interference to conjugative release by the oxygen atom. Substituent effects due to attached chlorine atoms seem t