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The parent of porphyrins is porphine, a rare chemical compound of exclusively theoretical interest. Substituted porphines are called porphyrins. [ 1 ] With a total of 26 π-electrons, of which 18 π-electrons form a planar, continuous cycle, the porphyrin ring structure is often described as aromatic .
In biochemistry, a porphyrinogen is a member of a class of naturally occurring compounds with a tetrapyrrole core, a macrocycle of four pyrrole rings connected by four methylene bridges. [1] They can be viewed as derived from the parent compound hexahydroporphine by the substitution of various functional groups for hydrogen atoms in the ...
Porphine or porphin is an organic compound of empirical formula C 20 H 14 N 4. It is heterocyclic and aromatic . The molecule is a flat macrocycle , consisting of four pyrrole -like rings joined by four methine bridges, which makes it the simplest of the tetrapyrroles .
The general term protoporphyrin refers to porphine derivatives that have the outer hydrogen atoms in the four pyrrole rings replaced by other functional groups. The prefix proto often means 'first' in science nomenclature (such as carbon protoxide), hence Hans Fischer is thought to have coined the name protoporphyrin as the first class of porphyrins. [3]
Here he detailed the synthesis of porphine, the fundamental ring system in all the porphyrins. He performed the porphin synthesis at a temperature of 90-95 °C and high pressure in sealed pyrex glass tubes, by reacting pyrrole, 2 % formaldehyde and pyridine in methanol for 30 hours. [7]
With 1,838 yards, the seven-year veteran has to average 133.5 yards in those final two games to seize the all-time mark. Barkley has topped that number in six of his 15 games this season.
Here, a four-porphyrin–zinc complex hosts a porphyrin guest. [20] Porphyrins are often used to construct structures in supramolecular chemistry. [21] These systems take advantage of the Lewis acidity of the metal, typically zinc. An example of a host–guest complex that was constructed from a macrocycle composed of four porphyrins. [20]
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