Gensler, Walter J. Formerly, Department of Chemistry, Boston University, Boston, Massachusetts.
- Additional Reading
One of a group of organic compounds containing a doubly unsaturated five-membered ring in which nitrogen occupies one of the ring positions. Pyrrole (1) is a representative compound. The pyrrole system is found in the green leaf pigment, chlorophyll, in the red blood pigment, hemoglobin, and in the blue dye, indigo. Interest in these colored bodies has been largely responsible for the intensive study of pyrroles. Tetrahydropyrrole, or pyrrolidine (2), is part of the structures of two protein amino acids, proline (3) and hydroxyproline, and of hygrine (4),
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