Abstract
Zinc(II) δ-trifluoroacetoxypheophorbides ( 5, 10) undergo macrocyclic ring cleavage, via zinc(II) oxochlorins after alkaline hydrolysis, to give dihydrobiliverdins ( 7, 11) in which the two lactam oxygen atoms are shown, by 18O 2 labeling experiments, to be derived from two different dioxygen molecules.
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