Abstract
Natural chlorins containing a residue of the nonesterified propionic acid in the pyrrole ring D were oxidized with 2,3-dichloro-5,6-dicyanobenzoquinone at C18 to yield exocyclic delta-lactones. The opening of the lactones in alkaline medium resulted in the corresponding 18-hydroxychlorins.
MeSH terms
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Chlorophyll / analogs & derivatives*
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Chlorophyll / chemistry
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Chlorophyll A
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Lactones / chemical synthesis
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Magnetic Resonance Spectroscopy
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Oxidation-Reduction
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Photosensitizing Agents / chemical synthesis*
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Porphyrins / chemistry*
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Pyrroles / chemistry*
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Spectrophotometry, Infrared
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Stereoisomerism
Substances
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Lactones
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Photosensitizing Agents
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Porphyrins
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Pyrroles
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Chlorophyll
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pyropheophorbide a
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chlorin
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pheophorbide a
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Chlorophyll A