Formation of 4-Halo-4-nitrocyclohexa-2,5-dienones on nitration of p-halophenols and p-halophenyl acetates
作者:Robin G. Clewley、Gordon G. Cross、Alfred Fischer、George N. Henderson
DOI:10.1016/0040-4020(89)80128-0
日期:1989.1
Nitration of p-chloro-, p-fluoro-, and p-bromo-phenol or the corresponding p-halophenyl acetates at t-40 °C and below gives the 4-halo-4-nitrocyclohexa-2, 5-dienones in addition to the 4-halo-2-nitrophenols. The dienones isomerize to the nitrophenols at temperatures between −40 °C and 0°C. Nitration of 4-chloro-2-methylphenol or its acetate gives both 4-chloro-2-methyl-4-nitrocyclohexa-2, 5-dienone
的硝化p氯代,p氟- ,和p溴苯酚或相应的p -halophenyl乙酸盐在t-40℃以下给出了4-卤代-4- nitrocyclohexa-2,除了5-二烯酮到4-卤-2-硝基苯酚。在-40℃至0℃之间的温度下,二烯酮异构化为硝基酚。将4-氯-2-甲基苯酚或其乙酸酯硝化,得到4-氯-2-甲基-4-硝基环己-2,5-二烯酮和4-氯-6-甲基-6-硝基环己-2,4-二烯酮。4-氯-3-甲基苯酚及其乙酸酯得到4-氯-3-甲基-4-硝基环己-2,5-二烯酮。