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ΔΔδ increased from 9.8 to 64.2 Hz for C-5-H and from 2.9 to 14.4 Hz for OAc on increasing the mole ratio Yb(HFBC)3/2 from 0.08 to 0.30. Under such conditions, all other proton signals were also splitted, each into two groups of ill-defined, broad patterns.
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We cannot overlook the fact that Verongida, to which our sponge belongs, contain large amounts of bacteria; cf. Bertrand, J.C., Vacelet, J.: C.R. Hebd. Séanc. Acad. Sci. Paris 34, 299 (1971)
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We thank MPI, CNR, and the Provincia Autonoma Trento (project control of phytopathogenesis) for financial support.
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Guerriero, A., D'Ambrosio, M., Traldi, P. et al. On the first marine natural product having low enantiomeric purity. Naturwissenschaften 71, 425–426 (1984). https://doi.org/10.1007/BF00365892
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DOI: https://doi.org/10.1007/BF00365892