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Assignment of the absolute configuration of a secondary alcohol can be carried out by comparison of its proton NMR spectra with that of its ester with 9-anthrylmethoxyacetic acid [(R) or (S)-9AMA]. The esterification shifts observed for the two substituents L 1 /L 2 of the alcohol depend on their spatial location with respect to the anthryl group. Identification of the substituent...
Six new dendrolasin-type hydroxylated sesquiterpenes have been isolated from the cytotoxic extracts of the marine tunicate Ritterella rete. The absolute stereochemistry of the new compounds was determined by a combination of spectroscopic and chemical correlations, including derivatization with a recently introduced NMR reagent. This is the first time furanoterpenes have been isolated from a marine...
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