following diazotisation and loss of nitrogen is determined by the nature of the intermediates formed. Where aryl radical intermediates are formed, the selectivity parallels that found in intermolecular competition by phenyl radicals, whereas copper-catalysed decomposition of the diazonium ion leads to intermediates which seem, from their selectivity, to possess considerable cationic nature. The slower thermal
合成了六种新的2-
氨基
三苯基甲醇(1)的不对称取代衍
生物。重
氮化和
氮损失后的闭环方向取决于所形成的
中间体的性质。在形成芳基自由基
中间体的情况下,选择性与在
苯基分子间竞争中发现的平行,而
铜催化的重
氮离子的分解导致
中间体从其选择性看来似乎具有相当大的阳离子性质。重
氮离子的较慢的热分解出乎意料地显示出很小的选择性,表明静电相互作用在决定关键
中间体的非常短的寿命中占主导地位。