NMR chemical shift and NMR isotope shift evidence for the influence of nonbonded interactions on charge distribution in. alpha.,. beta.-unsaturated …

…, VM Osterman, JR DeMember

Index: Forsyth,D.A.; Osterman,V.M.; Demember,J.R. Journal of the American Chemical Society, 1985 , vol. 107, p. 818

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Citation Number: 32

Abstract

Abstract: I3C NMR chemical shifts and deuterium isotope effects on chemical shifts in a, &unsaturated methoxycarbenium ions provide evidence regarding the influence of nonbonded interactions on charge distribution. The a,@-unsaturated methoxycarbenium ions exist as Z and E isomers due to restricted rotation about the C1-O bond. A 5-to 7-ppm difference between Z and E isomers at C,, which are sp2 carbons remote from the site of ...