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This article is about the chemical macrocycle. For the fictional planet
of the same name in Frank Herbert's Dune universe, see Corrin .
A corrin is a macrocycle related to the porphyrin ring in hemoglobin,
consisting of 4 pyrrole subunits, joined on opposite sides by a C-CH3
methylene link, on one side by a C-H methylene link, and with the two of
the pyrroles joined directly. Compared to a porphyrin, it is missing a
bridging methylene group between a pair of pyrroles. Also, the pyrrole
rings in corrin have fully saturated edge-carbons, that is, two hydrogens
attached compared to only one in porphyrins. This ring is central to the
cobalt containing vitamin, vitamin B12, or cobalamin. Corrins have
properties related to porphyrins, but:
· They are more flexible than porphyrins.
· They are not as flat as porphyrins.
· Because of the loss of the bridging methylene, and partly saturated p
