Bohn, Rene

Bacque, Henry, 46 Beck, Christoph, 99 Beijerinck, Martinus, 15 Bergius, Friedrich, 85, 224 Bernthsen, August, 76, 80 Berthelot, Marceline, 13 Berthollet, Claude-Louis, 3, 5, 61 Birkeland, Kristian, 53 Bohn, Rene, 75 Borchardt, Philipp, 102 Borlaug, Norman, 139 Bosch, Carl, 64, 75... 

Nevertheless, with the arrival of synthetic indigo in the 20th century, more beautiful and water-fast cotton dyes than ever before could be produced, e.g. Indanthrene Blue. Arising out of the chemistry of alizarin, work began on an-thraquinone dyestuffs. In 1901, Rene Bohn at BASF made a remarkable dis-... 

Chloroanthraquinone is especially useful as a base material for the production of 2-aminoanthraquinone, from which the vat dye indanthrene (Vat Blue 4) is produced by a method discovered by Rene Bohn in 1901, involving a reaction in alkaline solution with atmospheric oxygen in the presence of potassium nitrate at 150 to 200 °C. At higher temperatures and using antimony-(V)-chloride or aluminum chloride, flavanthrone (Vat Yellow 1) is obtained this is nowadays produced from l-chloro-2-aminoanthraquinone and PA. 

It is a blue vat dye discovered in 1901 by Rene Bohn. There are several commercial pigment grades, such as the usual Indanthrene Blue R, and a purer grade called Indanthrene Brilliant Blue FF (de Keijzer, 1990 Merckindex, 1996). 

---