桑塔格一直是那种兼具美貌与智慧的人中龙凤。Sontag has always been that rarity, a glamorous intellectual.国际象棋长久以来被认为是智慧的体现。Chess has long been regarded as a measure of intellect.诸葛亮在民间传说中成了智慧的代名词.Zhuge Liang is a synonym for wisdom in folklore...
方法: 用溴代及胺化反应合成了四甲基吡嗪衍生物.METHODS: The target compound was prepared by the bromination and amination reaction.用溴—甲醇溶解Al_2O_3, 其回收率在91%以上.If Al 2 O 3 is dissolved by Br 2 - CH 3 OH, its Recovery rate is above 91 %.用溴比用氯时产出率...