## Abstract Acylation of allyl alcohols induces strong carbon shifts, shielding γ and deshielding δ effects. These shifts are a consequence of through‐bond polarization of the olefinic carbons. Allyl ethers show similar, but milder perturbations. The olefinic carbon shifts reveal a strong concentra
Substituent effects in the 13C NMR spectra of 17α-ethinyl-19-nortestosterone derivatives
✍ Scribed by Peter E. Hammann; Elke Wöbbecke; Hans-Otto Hoppen
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 247 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The ^13^C NMR spectra of eight norethisterone derivatives are presented. Substituent chemical shifts for the methyl group at C‐18, the methylene group at C‐11 and the Δ^15^ double bond are evaluated and discussed.
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A systematic study has been made of the effects of substituent induced chemical shifts in [($-C,H,)(CO),Mo(CH,Cd€,R)] compounds. Both 9sM0 and "C NMR shifts in the aromatic ring are reported. The (q'-C5H,)(CO)&loCH2-group is a reasonably strong resonance donor (aR0=-0.21) and weak inductive donor (
## Abstract A general equation describing the effect of substituents on α‐carbons in a saturated framework was developed from ^13^C chemical shifts obtained under uniform conditions for selected aliphatic compounds. Experimental correlations for β‐ and γ‐carbons and a discussion of the results are
## Abstract ^13^C chemical shifts obtained under uniform conditions for selected compounds containing secondary aliphatic fragments were employed in a linear regression analysis. Two‐parameter relationships describing the substituent effects in the saturated framework were calculated, and the usefu
Ab initio IGLO (individual gauge for localized molecular orbital) methods of SCF-MO theory were used to extend studies of the conformational dependences of isotropic 13C NMR chemical shifts to n-hexane and three 1-substituted pentanes (X \ CN, OH, F). Isotropic shifts were obtained as a func-XCH 2 C