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
concentrated nitricacid 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
Friedel-crafts acetylation of durene,isodurene and prehnitene
作者:A.D. Ahdreou、R.V. Bulbulian、P.H. Gore
DOI:10.1016/0040-4020(80)80098-6
日期:1980.1
Good yields of acetyl- and diacetyl-durene, acetyl- and diacetyl-isodurene, and acetylprehnitene can be obtained by Friedel-Crafts acylations. Products arising from methyl-migration prior to acetylation are also formed. A claim of the formation of diacetylprehnitene is shown to be incorrect.