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[Directed modification of the pyrrole ring D in natural chlorins]
1Lomonosov State Academy of Fine Chemical Technology, pr. Vernadskogo 86, Moscow, 117571 Russia. mironov@httos.mitht.msk.ru
Bioorganicheskaia Khimiia
|May 19, 2001
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.