Nitration of Pentamethylnitrobenzene, Pentamethylbenzoic Acid and Its Methyl Ester, Pentamethylacetanilide, and Pentamethylphenol and Its Methyl Ether. Orienting Effect of the Substituents for the Side-chain Nitrooxylation
作者:Hitomi Suzuki、Kiyomi Nakamura
DOI:10.1246/bcsj.44.227
日期:1971.1
The nitration of a series of the titled pentamethylbenzene derivatives has been investigated in order to know the orienting effect of substituent groups for the side-chain nitrooxylation. The nitrooxylation was found to occur almost exclusively at the methyl groups adjacent to the electron-withdrawing substituents (NO2, COOH, and COOCH3), while with the compounds containing electron-donating groups (OH and OCH3) the main reaction led to the conversion into cyclohexadienone, with the concomitant formation of small amounts of meta-nitrooxylated product. Pentamethylacetanilide underwent side-chain nitrooxylation along with some deacetylation. The location of the nitrooxymethyl group seems to be most likely ortho and meta, the latter being predominant.
对一系列命名为五甲基苯衍生物的硝基化反应进行了研究,以了解取代基对侧链硝氧基化的取向效应。研究发现,硝氧基化几乎专门发生在与电子吸引取代基(NO2、COOH和COOCH3)相邻的甲基上,而含有电子供给基团(OH和OCH3)的化合物主要反应转化为环己二烯酮,同时生成少量的间硝氧化产品。五甲基乙酰苯胺发生了侧链硝氧基化,同时伴随一些去乙酰化反应。硝氧基甲基的位置似乎最有可能是邻位和间位,后者占主导。