Nitration of phenolic compounds by metal salts impregnated Yb-Mo-montmorillonite KSF

Abstract

Metal salts impregnated Yb-Mo-HKSF catalysts show high stabilities and catalytic abilities in nitration of various substituted phenols under mild conditions. In addition, these metal catalysts can be easily recovered and reused in the next batch of nitration of phenolic compounds. The process is convenient and represents a practical method for clean synthesis of nitrated phenols.

Palladium-Catalyzed Aromatic C–H Bond Nitration Using Removable Directing Groups: Regiospecific Synthesis of Substituted o-Nitrophenols from Related Phenols

“…Purified by column chromatography (petroleum ether/EtOAc, 6/1) as a white solid (34.0 mg, 87%); mp 68–70 °C (lit . mp 70–73 °C); IR (KBr): ν = 3298 (OH), 1524 (NO 2 ) cm –1 ; 1 H NMR (CDCl 3 , 500 MHz): δ 10.48 (s, 1H), 8.08 (d, J = 2.5 Hz, 1H), 7.65 (dd, J 1 = 9.0 Hz, J 2 = 2.5 Hz, 1H), 7.11 (d, J = 9.0 Hz, 1H), 1.34 (s, 9H); 13 C NMR (CDCl 3 , 125 MHz): δ 153.1, 143.7, 135.5, 133.1, 120.9, 119.5, 34.4, 31.1; MS (EI, 70 ev): m / z (%) = 195 [M + ].…”