Solvent effect in NMR spectroscopy: Methoxyl resonance shifts induced by trifluoroacetic acid in isoflavones
β Scribed by Hirday N. Jha; Sudershan K. Sanduja; Radhika Sanduja; Virinder S. Parmar
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 122 KB
- Volume
- 38
- Category
- Article
- ISSN
- 1386-1425
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π SIMILAR VOLUMES
We have observed that the benzene-induced solvent shifts ofcertain methoxyl groups in the NMR spectra of isoflavones are appreciably changed by the addition of a small amount of trifluoroacetic acid to the solution of the isoflavones in a 1: 1 mixture of chloroform and benzene. The methoxyl group at
Wnivereity of Salford, galford, Lance.) (Received in UK 27 July 1967) It is now ~011 known1 that benzene ooueee coneiderable Bolvent shifte of pi-&m reacnauoea (A-TC6D6 -fCCla) with respect to IYI 'inert' solvent in WWD spectra. The origin of suoh solvent shifts ie believed to lie in the ability of
## Abstract Chemical shifts of siliconβ29 in 39 trimethylsiloxy derivatives of 5Ξ±β and 5Ξ²βandrostanes reported here satisfy an empirical linear correlation with terms describing molecular geometry. The steric ^29^Si chemical shifts are controlled by association of the silyl ethers with the hydrogen