ChemInform Abstract: NMR in the Elucidation of Complex Structures. Application to Two Novel Heptanortriterpenoid Derivatives from the Stem Bark of Entandrophragma utile (Meliaceae)

Abstract

[Part of Introduction in lieu of Abstract] I am interested in developing ideas and procedures whereby the process of structural elucidation by means of NMR spectroscopy can be made more free of prejudice, and in this paper I wish to demonstrate how it is possible to construct a structural elucidation argument for a reasonably complex molecule without having to invent 'candidate structures' or refer to a 'working structure'. By proceeding in a logical manner we reach a conclusion knowing clearly what we have had to assume and what we have been able to prove.