6,6′-Dibromoindigo

6,6'-Dibromoindigo is an organic compound with the formula (BrC6H3C(O)CNH)2. A deep purple solid, the compound is also known as Tyrian purple, a dye of historic significance. Presently, it is only a curiosity, although the related derivative indigo is of industrial significance. The molecule consists of a pair of monobrominated indole rings linked by a carbon-carbon double bond. It is produced by molluscs of the Muricidae species.[1]

6,6′-Dibromoindigo
Names
Other names
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
KEGG
UNII
  • InChI=1S/C16H8Br2N2O2/c17-7-1-3-9-11(5-7)19-13(15(9)21)14-16(22)10-4-2-8(18)6-12(10)20-14/h1-6,19,21H
  • Key: UOZOCOQLYQNHII-UHFFFAOYSA-N
  • C1=CC2=C(C=C1Br)NC(=C2O)C3=NC4=C(C3=O)C=CC(=C4)Br
Properties
C16H8Br2N2O2
Molar mass 420.060 g·mol−1
Appearance purple solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Biosynthesis

The biosynthesis proceeds by the intermediacy of tyrindoxyl sulphate.[2]

6BrIG can also be produced enzymatically in vitro from the amino acid tryptophan. The sequence begins with bromination of the benzo ring followed by conversion to 6-bromoindole. Flavin-containing monooxygenase then couples two of these indole units to give the dye.

Chemical synthesis

The main chemical constituent of the Tyrian dye was discovered by Paul Friedländer in 1909 to be 6,6′-dibromoindigo, derivative of indigo dye, which had been synthesized in 1903.[3][4] Although the first chemical synthesis was reported in 1914, unlike indigo, it has never been synthesized at commercial level.[5][6] An efficient protocol for laboratory synthesis of dibromoindigo was developed in 2010.[7]

References
  1. McGovern, Patrick E.; Michel, R. H. (1990). "Royal Purple dye: The chemical reconstruction of the ancient Mediterranean industry". Accounts of Chemical Research. 23 (5): 152–158. doi:10.1021/ar00173a006.
  2. Valles-Regino, Roselyn; Mouatt, Peter; Rudd, David; Yee, Lachlan; Benkendorff, Kirsten (2016). "Extraction and Quantification of Bioactive Tyrian Purple Precursors: A Comparative and Validation Study from the Hypobranchial Gland of a Muricid Dicathais orbita". Molecules. 21 (12): 1672. doi:10.3390/molecules21121672. PMID 27929402.
  3. Friedlaender, P. (1909). "Zur Kenntnis des Farbstoffes des antiken Purpurs aus Murex brandaris" [Towards understanding the ancient purple dye from Murex brandaris]. Monatshefte für Chemie. 30 (3): 247–253. doi:10.1007/BF01519682. S2CID 97865025.
  4. Sachs, Franz; Kempf, Richard (1903). "Über p-Halogen-o-nitrobenzaldehyde". Berichte der Deutschen Chemischen Gesellschaft. 36 (3): 3299–3303. doi:10.1002/cber.190303603113.
  5. "Indigo". Encyclopædia Britannica. Vol. V (15th ed.). Chicago, IL: Encyclopædia Britannica, Inc. 1981. p. 338. ISBN 0-85229-378-X.
  6. Cooksey, C.J. (2001). "Tyrian purple: 6,6'-dibromoindigo and related compounds" (PDF). Molecules. 6 (9): 736–769. doi:10.3390/60900736. S2CID 5592747.
  7. Wolk JL, Frimer AA (August 2010). "A simple, safe and efficient synthesis of Tyrian purple (6,6'-dibromoindigo)". Molecules. 15 (8): 5561–5580. doi:10.3390/molecules15085561. PMC 6257764. PMID 20714313.
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