meso-Octamethylporphyrinogen, usually referred to simply as octamethylporphyrinogen, is an organic compound with the formula (Me2C-C4H2NH)4 (Me = CH3. It is one of the simplest porphyrinogens, a family of compounds that occur as intermediates in the biosynthesis of hemes and chlorophylls. In contrast to those rings, porphyrinogens are colorless since they lack extended conjugation. The prefix meso-octamethyl indicates that the eight methyl groups are located on the carbon centers that interconnect the four pyrrole rings. Also unlike porphyrins, the porphyrinogens are highly ruffled.[1]
Preparation
The compound was first reported by Adolph Bayer.[2] It is made by condensation of pyrrole with acetone.[3]
The pyrrolic N-H centers of ctamethylporphyrinogen can be deprotonated, and the resulting tetraanion functions as a tetradentate ligand for a variety of metal ions.[5]
References
^Gale, Philip A.; Sessler, Jonathan L.; Král, Vladimír (1998). "Calixpyrroles". Chemical Communications: 1–8. doi:10.1039/A706280J.
^Sobral, Abilio J.F.N. (2005). "Synthesis of Meso-Octamethylporphyrinogen: An Undergraduate Laboratory Mini-Scale Experiment in Organic Heterocyclic Chemistry". Journal of Chemical Education. 82 (4): 618. Bibcode:2005JChEd..82..618S. doi:10.1021/ed082p618.
^Allen, William E.; Gale, Philip A.; Brown, Christopher T.; Lynch, Vincent M.; Sessler, Jonathan L. (1996). "Binding of Neutral Substrates by Calix[4]pyrroles". Journal of the American Chemical Society. 118 (49): 12471–12472. doi:10.1021/ja9632217.
^Bachmann, Julien; Hodgkiss, Justin M.; Young, Elizabeth R.; Nocera, Daniel G. (2007). "Ground- and Excited-State Reactivity of Iron Porphyrinogens". Inorganic Chemistry. 46 (3): 607–609. doi:10.1021/ic0616636. PMID17256999.
