Etioporphyrin

Title: Etioporphyrin
CAS Registry Number: 26608-34-4
CAS Name: 2,7,12,18-Tetraethyl-3,8,13,17-tetramethyl-21H,23H-porphine
Additional Names: 1,3,5,8-tetramethyl-2,4,6,7-tetraethylporphine; etioporphyrin III; mesoetioporphyrin
Molecular Formula: C32H38N4
Molecular Weight: 478.67
Percent Composition: C 80.29%, H 8.00%, N 11.70%
Literature References: Occurs in Bavarian oil shale, crude petr, ozokerite, amber, cannel coal and other hard varieties of bituminous coal: Treibs, Ann. 510, 60 (1934); 517, 184 (1935); Angew. Chem. 49, 682 (1936). Prepd by decarboxylation of mesoporphyrin IX: Fischer, Treibs, Ann. 466, 191, 206 (1928). Synthesis: Fischer, Stangler, Ann. 462, 265 (1928); Johnson et al., J. Chem. Soc. 1959, 3416. Structure: Abraham et al., ibid. 1961, 3468. Review: Rimington, Kennedy, in M. Florkin, H. S. Mason, Comparative Biochemistry (Academic Press, New York, 1962) pp 557-614.
Properties: Long prismatic needles or butterflies from pyridine or from chloroform-petr ether, mp 360-363°. pKa 18. Absorption max: 246, 269, 396, 497, 532, 566, 620, 645 nm (log e 3.90, 3.89, 5.22, 4.13, 3.99, 3.81, 3.65, 2.62).
Melting point: mp 360-363°
pKa: pKa 18
Absorption maximum: Absorption max: 246, 269, 396, 497, 532, 566, 620, 645 nm (log e 3.90, 3.89, 5.22, 4.13, 3.99, 3.81, 3.65, 2.62)
Derivative Type: Copper salt
Molecular Formula: C32H36N4Cu
Molecular Weight: 540.20
Percent Composition: C 71.15%, H 6.72%, N 10.37%, Cu 11.76%
Properties: Red needles from pyridine-acetic acid.
Derivative Type: Magnesium salt
Molecular Formula: C32H36N4Mg
Molecular Weight: 500.96
Percent Composition: C 76.72%, H 7.24%, N 11.18%, Mg 4.85%
Properties: Crystals from methanol.
Etiprednol Dicloacetate Etiproston Etiroxate Etisazol Etizolam