yel lfts(from ale), mp 157-8°(expl violently at higher temps); apparent d 0.27, cryst d at 25° 1.65, pressed d 0.86 at 3400psi(239kg/cm2)(Refs 9 & 10), pressed d 1.14 at 3000psi(Ref 25). Solubilities in g per lOOg solvent at 50°: 2.45 in ethyl acetate, 2.43 ethanol, 1.25 methanol, 0.73 ethylene dichloride, 0.23 benz, 0.15 toluene & 0.11 chlf; 0.08g in ether at 30°(Refs 9 & 25); mod sol in glac AcOH; nearly insol in w, CC14, CS2 & petr ether. Was first prepd by Griess(Ref 3) by diazotization of 4,6-dinitro-2-aminophenol(pic-ramic acid) with Na nitrite in dil hydrochloric or sulfuric acid. Other methods of prepn are listed in Ref 1. Davis(Ref 9) described a lab method. Patents for industrial prepns were granted to Hancock & Pritchett(Ref 6), Alexander(Ref 7), and Babock(Ref 8)
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