Diels-Alder reaction of methyl-substituted 1, 3-butadienes (1) with 1, 2-dibromoethylene gave dibromomethylcyclo-hexenes (2), which were subjected to epoxidation, followed by dehydrobromination of the resultant dibromo oxides (3) to afford 3-methylbenzene oxide (4a) and 1-methylbenzene oxide (4b). However, 4-methylbenzene oxide (4c) could not be obtained in this way.
甲基取代的
1,3-丁二烯(1)与
1,2-二溴乙烯的Diels-Alder反应生成二
溴甲基环己烯(2),然后对生成的二
溴氧化物(3)进行环氧化,再进行去
溴化反应,得到3-甲基苯氧化物(4a)和1-甲基苯氧化物(4b)。然而,无法通过这种方法获得4-甲基苯氧化物(4c)。