“…In the case of compound 1b, it seems that the axial disposition of the hydroxyl, anticlinal to the oxygen of the carbonyl group, makes impossible the complex formation. Compounds 2a and 4a were compared with those previously obtained by the osmium tetroxide dihydroxylation procedure 4,6 , the 1 H NMR data as well as NOESY experiments confirmed the 2α,3α stereochemistry of the diol in compounds 2b, 4b and 6.…”