Author:
Culvenor CCJ,Heffernen ML,Woods WG
Abstract
The chemical shifts and coupling constants
of the protons in retronecine and heliotridine are derived by detailed analysis
of the nuclear magnetic resonance spectra of these compounds. The factors which
influence the appearance and ease of interpretation of spectra of pyrrolizidine
derivatives, principally the chemical shift difference of the H 6 protons and
conformational averaging, are discussed.
The conformations of retronecine and
heliotridine are discussed in relation to their coupling constants; the former
compound is exo-buckled whereas the latter is a mixture of rapidly
interconverting exo- and endo-buckled forms.
Cited by
59 articles.
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