Edulan I and edulan II have been shown by synthesis to be the stereoisomeric 2,3,5,6-tetrahydro-2,5,5,8a-tetramethyl-(8aH)-1-benzopyrans (IVa) and (IVb), the configurations of which are established by the results of microhydrogenation.
D. R. Adams, S. P. Bhatnagar, R. C. Cookson, G. Stanley and F. B. Whitfield, J. Chem. Soc., Chem. Commun., 1974, 469 DOI: 10.1039/C39740000469
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