Hexahydroporphine

Hexahydroporphine
Names
	IUPAC name 5,10,15,20,22,24-Hexahydroporphyrin
	Other names Porphyrinogen; Calix[4]pyrrole
Identifiers
CAS Number	4396-11-6;
3D model (JSmol)	Interactive image;
Beilstein Reference	7545460
ChEBI	CHEBI:26213;
ChemSpider	7827582;
PubChem CID	9548659;
	InChI InChI=1S/C20H20N4/c1-2-14-10-16-5-6-18(23-16)12-20-8-7-19(24-20)11-17-4-3-15(22-17)9-13(1)21-14/h1-8,21-24H,9-12H2 Key: VCRBUDCZLSQJPZ-UHFFFAOYSA-N;
	SMILES C1C2=CC=C(N2)CC3=CC=C(N3)CC4=CC=C(N4)CC5=CC=C1N5;
Properties
Chemical formula	C20H20N4
Molar mass	316.408 g·mol−1
Appearance	Colorless solid
Melting point	185 °C (365 °F; 458 K) (decomposes)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Hexahydroporphine is an organic chemical compound with formula C₂₀H₂₀N₄. The molecule consists of four pyrrole rings connected by methylene bridges −CH₂− into a larger (non-aromatic) macrocycle ring, which makes it one of the simplest tetrapyrroles, and the simplest "true" one. As indicated by the name, it may be viewed as derived from porphine by the addition of six hydrogen atoms: four on the methine bridges, and two on the nitrogen atoms.

Hexahydroporphine does not occur in nature, but is the core of porphyrinogens such as uroporphyrinogen III (UROGEN), which are precursors of many porphyrins — derivatives of porphine of great biological importance. The six hydrogens of that core are removed at a later metabolic stage by the enzyme protoporphyrinogen oxidase. Because of this connection, the compound is also called (unsubstituted) porphyrinogen.

The compound is a colorless solid, soluble in dichloromethane, acetone, and diethyl ether. It decomposes at 185°C.

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