Preparation of Tyrian Purple (6,6′-Dibromoindigo): Past and Present
Abstract
:1. Introduction
2. Preparation Tyrian Purple from 4-Bromo-2-nitrobenzaldehyde
2.1. The original synthesis and its elaborations
2.2. Alternative preparations of 4-bromo-2-nitrotoluene (12)
2.3. Alternative preparations of 4-bromo-2-nitrobenzaldehyde (8)
3. Preparation of Tyrian Purple from 4-Bromo-2-aminobenzoic Acid or Its Derivatives
3.1. Friedländer synthesis of Tyrian purple
3.2. Alternative syntheses of 4-bromo-2-aminobenzoic acid (43) and its derivatives
4. Other Syntheses
4.1. From 6,6′-diaminoindigo
4.2. Dibromoindigo (1) from indoles
4.3. Dibromoindigo (1) from 6-bromoindole
5. Recent Convenient Low-Cost Synthesis of Tyrian Purple
References
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Wolk, J.L.; Frimer, A.A. Preparation of Tyrian Purple (6,6′-Dibromoindigo): Past and Present. Molecules 2010, 15, 5473-5508. https://doi.org/10.3390/molecules15085473
Wolk JL, Frimer AA. Preparation of Tyrian Purple (6,6′-Dibromoindigo): Past and Present. Molecules. 2010; 15(8):5473-5508. https://doi.org/10.3390/molecules15085473
Chicago/Turabian StyleWolk, Joel L., and Aryeh A. Frimer. 2010. "Preparation of Tyrian Purple (6,6′-Dibromoindigo): Past and Present" Molecules 15, no. 8: 5473-5508. https://doi.org/10.3390/molecules15085473