Abstract
Thermal acid-catalyzed liquid-phase dehydration of 1-(4-aminophenyl)ethanol at 250–260°C and 30–100 mm Hg was studied. In the presence of KHSO4 a 2:1 mixture of 1-amino-4-ethylbenzene with 4-aminostyrene is formed, the use of KHSO4/KH2PO4 causes the formation of polymers, and the use of H3BO3 (≤ 0.26 wt %) in a mixture with KHSO4 allows the preparation of pure 4-aminostyrene. The structure of the reaction products was confirmed by NMR spectroscopy and by authentic synthesis.
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