13C Nuclear Magnetic Resonance Spectra of Methoxycyclohexane Derivatives. Rotamer Populations about C-OMe Bonds as indicated by 13C Chemical Shifts of Methoxy- and Ring-carbons and 3JC,H Coupling Constants
Methoxy 13C chemical shifts in methoxycyclohexane derivatives may be rationalized in terms of rotamer populations about the C-OMe bond and δ1-effects caused by steric interaction of the methoxy-group with substituents at the neighbouring 2- and 6-positions.Information on rotamer populations is obtained also from the 13C chemical shifts of C-2 and C-6, and from the three-bond coupling between the proton at C-1 and the methoxy-carbon atom.
Haines, Alan H.,Shandiz, Mohammad Seyedi
p. 1671 - 1678
(2007/10/02)
STEREOCHEMICAL STUDIES-XXV. CONFORMATIONAL EQUILIBRIA OF 2-SUBSTITUTED 1,1-DIALKYLCYCLOHEXANES
The positions of the conformational equilibria in a series of 1,1,2-trisubstituted cyclohexanes have been determined by 1H NMR.The gauche-interaction of substituents in the 1,1-dimethyl series are, in general, very close to those of monosubstituted cycloh
Mursakulov, Ismail G.,Ramazanov, E. A.,Guseinov, M. M.,Zefirov, Nikolai S.,Samoshin, V. V.,Eliel, Ernest L.
p. 1885 - 1890
(2007/10/02)
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