Abstract
Publisher Summary The chemical shift of any proton, or group of equivalent protons, depends on the sum of all remote influences and on the relative position in space of the groups concerned, whether determined by configurational or conformational factors, which are generally not easily separated. A group may influence the chemical shift of a proton via a variety of mechanisms, which are, to a greater or lesser extent, dependent on stereochemical factors and which need not necessarily all act in the same direction, much as the inductive and resonance effects because of a particular group often oppose each other. This chapter focuses on chemical shifts for ring protons and methyl groups in cyclopropanes and hetero-cyclopropanes. As with structures containing double bonds or three-membered rings, the presence of fused rings often implies relative rigidity of the molecular framework and, hence, some likelihood of obtaining useful stereochemical information from chemical shifts. The chapter discusses the nuclear magnetic resonance spectra of substituted norbornanes and related systems.
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