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Possible directions for extradiol ring cleavage of 3-chlorocatechol and conversion of the ring fission products. Compounds: I, 3-chloro-2-hydroxymuconic semialdehyde; II, 3-chloro-2-methoxymuconic semialdehyde methyl ester; III, 3-chloropicolinic acid; IV, 2-hydroxymuconic acid chloride; V, 6-chloropicolinic acid; VI, 2-hydroxymuconic acid.
