The Nitration of Acylpentamethylbenzenes and 1,3-Diacyltetramethylbenzenes Bearing, as the Acyl Components, Pivaloyl, Trichloroacetyl, and Tribromoacetyl Groups. Exclusive Attack on the Methyl Group at the Most Crowded Site
作者:Hitomi Suzuki、Mitsuyuki Hashihama、Tadashi Mishina
DOI:10.1246/bcsj.54.1186
日期:1981.4
concentrated nitric acid in dichloromethane at room temperature, the title compounds undergo an exclusive attack on the methyl group at the most crowded site, giving 6-acyl-2,3,4,5-tetramethylbenzyl nitrates, and 2,6-diacyl-3,4,5-trimethylbenzyl nitrates and/or (2,6-diacyl-3,4,5-trimethylphenyl)nitromethanes respectively, as the major products. While the predominant mode of the side-chain substitution
当在室温下用浓硝酸在二氯甲烷中处理时,标题化合物在最拥挤的位置对甲基进行独家攻击,得到 6-酰基-2,3,4,5-四甲基苄基硝酸盐和 2,6-主要产品分别为二酰基-3,4,5-三甲基苄基硝酸酯和/或(2,6-二酰基-3,4,5-三甲基苯基)硝基甲烷。虽然侧链取代反应的主要模式是酰基五甲基苯和 1,3-二新戊酰基-2,4,5,6-四甲基苯的硝基酰化,但它转移到 1,3-双(三卤代乙酰基)-2,4 的硝化, 5,6-四甲基苯。新戊酰苯在某种程度上可以看到硝基脱酰化,但三卤代乙酰苯则不然。