The oxazaborolidine (9)‐catalyzed reduction of acetylporphyrins (4) led to enantiomerically pure hydroxyethylporphyrins (5), which were transformed into optically active chlorin derivatives (7 and 8) upon reaction by N,N‐dimethylacetamide dimethyl acetal followed by hydrogenation. The absolute configuration of the synthesized chlorins was elucidated by means of their CD spectra.
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Kusch et al. (1996) studied this question.
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