Products Obtained by the Reaction of Trichlorotrimethylbenzenes with Fuming Nitric Acid. Side-chain Nitrooxylation<i>versus</i>Oxidation to Unsaturated Cyclic Ketones
作者:Hitomi Suzuki、Shigeru Maruyama、Terukiyo Hanafusa
DOI:10.1246/bcsj.47.876
日期:1974.4
The reaction of trichlorotrimethylbenzenes with fuming nitric acid has been investigated. Trichloropseudocumene underwent both side-chain nitrooxylation and nuclear oxidation to give 2,5,6-trichloro-3,4-dimethylbenzyl nitrate, 3,5,6-trichloro-2,4-dimethylbenzyl nitrate, and 3,6-dichloro-4-nitro-2,4,5-trimethylcyclohexa-2,5-dienone. Trichloromesitylene yielded a mixture of several carbonyl compounds, from which 3,5-dichloro-4-hydroxy-2,4,6-trimethylcyclohexa-2,5-dienone and two nitro-ketones, tentatively formulated as 2,4,6-trichloro-5-hydroxy-6-nitro-2,3,5-trimethylcyclohex-3-enone and 3,5-dichloro-2-hydroxy-6,6-dinitro-2,4,5-trimethylcyclohex-3-enone, were obtained as crystalline products by chromatography and fractional extraction. Trichlorohemimellitene behaved similarly towards the nitrating agent to give 2,6-dichloro-4-hydroxy-3,4,5-trimethylcyclohexa-2,5-dienone as the major product. The competitive modes of side-chain nitrooxylation and formation of cyclic ketones have been described.
研究了三氯三甲基苯与发烟硝酸的反应。三氯伪二苯经过侧链硝氧基化和核氧化反应,生成了 2,5,6- 三氯-3,4-二甲基苄基硝酸盐、3,5,6-三氯-2,4-二甲基苄基硝酸盐和 3,6- 二氯-4-硝基-2,4,5-三甲基环己-2,5-二烯酮。三氯甲基产生了几种羰基化合物的混合物,其中有 3,5-二氯-4-羟基-2,4,6-三甲基环己-2,5-二烯酮和两个硝基酮,暂定为 2,4,6-三氯-5-羟基-2,4,6-三甲基环己-2,5-二烯酮、通过色谱法和分馏萃取法获得了结晶产品--6-三氯-5-羟基-6-硝基-2,3,5-三甲基环己-3-烯酮和 3,5-二氯-2-羟基-6,6-二硝基-2,4,5-三甲基环己-3-烯酮。三氯亚甲基对硝化剂的作用类似,主要产物为 2,6-二氯-4-羟基-3,4,5-三甲基环己-2,5-二烯酮。侧链硝酰氧基化和环酮形成的竞争模式已被描述。