3,5-Diiodotyrosine
Title: 3,5-Diiodotyrosine
CAS Registry Number: 66-02-4
Additional Names: 3,5-Diiodo-4-hydroxy-b-phenylalanine; iodogorgoic acid
Trademarks: Agontan (Knoll)
Molecular Formula: C9H9I2NO3
Molecular Weight: 432.98
Percent Composition: C 24.97%, H 2.10%, I 58.62%, N 3.23%, O 11.09%
Literature References: Found in the skeletal proteins of corals, sponges, and other marine organisms. Isoln from Gorgonia cavollini as the DL acid: Drechsel, Z. Biol. 33, 99; Jahresber. Tierchemie 1896, 574; Henze, Z. Physiol. Chem. 38, 71 (1903); isoln from the common sponge: Wheeler, Mendel, J. Biol. Chem. 7, 1 (1909-10); Low, J. Mar. Res. 10, 239 (1951); from marine algae: Coulson, Chem. Ind. (London) 1953, 997; prepn from L- or DL-tyrosine: Henze, Z. Physiol. Chem. 51, 67 (1907); Borrows et al., J. Chem. Soc. 1949, Suppl. Issue no. 1, S185; Jurd, J. Am. Chem. Soc. 77, 5747 (1955); Boyle, Zlatkis, US 2835700 (1958 to Basic, Inc.).
 
Derivative Type: L-Form
Properties: Bunches of needles from water or 70% alcohol, dec 213°. [a]D20 +2.89° (0.246 g in 5 g 4% HCl); [a]D20 +2.27° (0.227 g in 5 g 25% NH3). pK1 2.12; pK2 6.48; pK3 7.82. Soly in water (g/l): at 0° = 0.204; at 25° = 0.617; at 50° = 1.862; at 75° = 5.62; at 100° = 17.00. On boiling with dil alc the crystals swell, and after prolonged boiling a gelatinous precipitate is formed.
pKa: pK1 2.12; pK2 6.48; pK3 7.82
Optical Rotation: [a]D20 +2.89° (0.246 g in 5 g 4% HCl); [a]D20 +2.27° (0.227 g in 5 g 25% NH3)
 
Derivative Type: DL-Form
Properties: Double wedge crystals from 70% alc, rectangular plates from water. Dec about 200°. Soly in water (g/l): at 0° = 0.149; at 25° = 0.340; at 50° = 0.773. On cooling a boiled hydroalcoholic soln, no gelatinous precip is formed.
 
Therap-Cat: Thyroid inhibitor.
Keywords: Antihyperthyroid.

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