Abstract
Nuclear Overhauser enhancement experiments show that migratory aptitudes of alkyl groups in various vis-dihydroxybacteriopurpurins are different for individual stereoisomers. Long wavelength absorption maxima of ketobacteriopurpurins obtained from pinacol-pinacolone rearrangements of the corresponding diols are influenced by the position of the keto group in the macrocycle; differences in these maxima are diminished by introduction of electron-withdrawing substituents.
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