A Systematic Investigation of Long-Range Couplings in the1H NMR Spectra of Dimeric Indanones
β Scribed by Susanne Felsinger; Hermann Kalchhauser; Horst Neudeck
- Publisher
- Springer Vienna
- Year
- 2001
- Tongue
- English
- Weight
- 143 KB
- Volume
- 132
- Category
- Article
- ISSN
- 0026-9247
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π SIMILAR VOLUMES
Long-range couplings were observed between protons attached to c-2 and c-5 of the 4-imidazolidinone ring. Smce 45(25) has a measurable value only for a trans arrangement of H-2 and H-5, this coupling can be utilized as an easy method of identification of 4-imidazolidinone stereoisomers.
## Abstract Unresolvable long range spinβspin coupling which is not explicitly taken into account in total NMR bandshape analysis is demonstrated to be a potentially important source of systematic error, leading to Ξ__H__^β ^ and Ξ΄__S__^β ^ values incorrect by __c__. 1 kcal/mol and 2 to 4 cal/(mol K)