Synthesis of 2,3,6,7-Tetramethylnaphthalene from 2,3-Dimethylsuccinic Anhydride and<i>o</i>-Xylene
作者:Yasuhiko Dozen、Masato Hatta
DOI:10.1246/bcsj.48.2842
日期:1975.10
2,3,6,7-Tetramethylnaphthalene (7b) was prepared from 2,3-dimethylsuccinic anhydride (1) and o-xylene in five steps, and the configurations of their intermediates were studied. The higher-melting isomer (threo form) of 1 gave higher-melting products in each step, while the lower-melting isomer (erythro form) of 1 gave lowermelting ones. The configurations of the intermediates were confirmed by the
以2,3-二甲基琥珀酸酐(1)和邻二甲苯为原料,分五步制备2,3,6,7-四甲基萘(7b),并对其中间体的构型进行了研究。1 的高熔点异构体(苏式形式)在每个步骤中产生高熔点产物,而 1 的低熔点异构体(赤型)产生低熔点产物。四甲基四氢化萘 (6b) 的 MNR 光谱数据证实了中间体的构型。用 3-苯甲酰基-2,3-二甲基丙酸 (2a) 进行了类似的反应,以了解中间体的构型。3-芳酰基-2,3-二甲基丙酸(2)在与盐酸一起加热后得到2,3-二甲基-4-芳基-3-丁烯-4-油化物(3)。