## Abstract NMR solvent effects induced by benzene on several __N__‐ and __O__‐alkyl oximes are reported. Both shielding and deshielding effects are observed and are accounted for by the geometry of the solute‐solvent ‘complex’. Good Hammett plots of solvent shifts for various types of protons are
Solvent effects in NMR spectra induced by aromatic solvents in 1,4-dioxanes, 1,3-dioxolanes and in sulphur analogues
✍ Scribed by N. E. Alexandrou; P. M. Hadjimihalakis
- Publisher
- John Wiley and Sons
- Year
- 1969
- Tongue
- English
- Weight
- 206 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
NMR solvent effects induced by aromatic solvents on some 1,4-dioxanes, 1,3-dioxolanes and on some sulphur analogue derivatives are reported. The shielding effect of the aromatic solvents is examined in respect to the structure of the solute.
📜 SIMILAR VOLUMES
Proton chemical shifts as well as solvent shifts induced by benzene in several amidoximes are examined with respect to their configuration and are compared to the solvent shifts induced in benzalanilines. The geometry of the benzene-solute 'collision-complex' is also discussed.
## Abstract Four 3′‐hydroxy‐4′‐methoxy‐isoflavonoids: calycosin‐7‐__O__‐β‐D‐glucopyranoside (1), calycosin (2), pratensein‐7‐__O__‐β‐D‐glucopyranoside (3), and pratensein (4) were isolated from __Astragalus membranaceus__ **var.** __mongholicus__, among which compound 4 was obtained from this plant
## Abstract NMR solvent effects induced by benzene in methyl substituted benzoic esters can be effectively used in the interpretation of complex NMR spectra. A 1:1 collision complex between solvent and solute is proposed, supported by dilution curve experiments and the geometry of the ‘complex’ is