Preparation of Tyrian Purple (6,6′-Dibromoindigo): Past and Present

Abstract

Over the past century, various synthetic approaches have been suggested to the most famous dye of antiquity, Tyrian purple (6,6′-dibromoindigo). These synthetic routes have been exhaustively surveyed and critically evaluated from the perspective of convenience, cost, safety and yield.

Keywords

• 6,6’-dibromoindigo
• Tyrian purple
• synthesis