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Octaethylporphyrin

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Octaethylporphyrin
Names
Other names 2,3,7,8,12,13,17,18-Octaethyl-21H,23H-porphine
Identifiers
CAS Number
3D model (JSmol)
Beilstein Reference 379798
ChEBI
ChemSpider
EC Number
  • 220-243-8
PubChem CID
UNII
CompTox Dashboard (EPA)
InChI
  • InChI=1S/C36H46N4/c1-9-21-22(10-2)30-18-32-25(13-5)26(14-6)34(39-32)20-36-28(16-8)27(15-7)35(40-36)19-33-24(12-4)23(11-3)31(38-33)17-29(21)37-30/h17-20,37,40H,9-16H2,1-8H3/b29-17-,30-18-,31-17-,32-18-,33-19-,34-20-,35-19-,36-20-Key: HCIIFBHDBOCSAF-MUZKIALCSA-N
SMILES
  • CCC1=C(C2=CC3=NC(=CC4=C(C(=C(N4)C=C5C(=C(C(=N5)C=C1N2)CC)CC)CC)CC)C(=C3CC)CC)CC
Properties
Chemical formula C36H46N4
Molar mass 534.792 g·mol
Appearance purple solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references
Chemical compound

Octaethylporphyrin (H2OEP) is an organic compound that is a relative of naturally occurring heme pigments. The compound is used in the preparation of models for the prosthetic group in heme proteins. It is a dark purple solid that is soluble in organic solvents. As its conjugate base OEP, it forms a range of transition metal porphyrin complexes. When treated with ferric chloride in hot acetic acid solution, it gives the square pyramidal complex Fe(OEP)Cl. It also forms the square planar complexes Ni(OEP) and Cu(OEP).

Saturated solution of H2OEP in dichloromethane.

Contrast with other porphyrins

Unlike complexes of the naturally occurring porphyrins, OEP complexes have four-fold symmetry, which simplifies spectroscopic analysis. In contrast to tetraphenylporphyrin and related analogues, H2OEP features unprotected meso positions. In this way, it is a more accurate model for naturally occurring porphyrins.

Synthesis

H2OEP is prepared by condensation of 3,4-diethylpyrrole with formaldehyde.

References

  1. Chang, C. K.; DiNello, R. K.; Dolphin, D. (1980). "Iron Porphines". Inorg. Synth. 20: 147. doi:10.1002/9780470132517.ch35.
  2. Sessler, Jonathan L.; Mozaffari, Azadeh; Johnson, Martin R. (1992). "3,4-Diethylpyrrole and 2,3,7,8,12,13,17,18-Octaethylporphyrin". Org. Synth. 70: 68. doi:10.15227/orgsyn.070.0068.
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