Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 347, Issue 9, Pages 1235-1241Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.200404364
Keywords
amines; liquid-liquid-liquid PTC; nitroaromatics; phase transfer catalysis; reduction; triphasic catalysis
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The selective reduction of nitroaromatics to the corresponding amines is an important transformation since many aromatic amines exhibit biological activities and find a multitude of industrial applications, being intermediates for the synthesis of dyes, pharmaceuticals and agrochemicals. A variety of nitroaromatics dissolved in organic solvents was reduced by using aqueous sodium sulfide, and tetrabutylammonium bromide (TBAB) as the phase transfer catalyst by choosing appropriate concentrations which resulted in three immiscible liquid phases. Compared to L-L PTC, the L-L-L PTC offers much higher rates of reaction, better selectivities and repeated use of catalyst. The selectivities for the desired products were 100%.
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