Update on Martius Yellow- Don’t mix with acetone!

As it turns out, the crystals of "Martius yellow" that I recovered from the acetone washings are truthfully not Martius yellow. Unfortunately, I failed to realize this until after I recrystallized my entire supply. The compound, while also an intensely colored yellow-orange dye, is much darker in the solid form than Martius yellow acid. It … Continue reading Update on Martius Yellow- Don’t mix with acetone!

Failed synthesis of Martius yellow

I attempted to synthesize Martius yellow (2,4-dinitro-1-naphthol) today using the procedure from Fieser's Experiments in Organic Chemistry, which may be found in the Sciencemadness library. Unfortunately, I did not get the expected results. Procedure: 10 mL of 95% ACS grade sulfuric acid was added swiftly to a 50 mL Erlenmeyer flask containing 5 grams of … Continue reading Failed synthesis of Martius yellow