Singlet carbenes are not always isolable and often even elude direct detection. When they escape observation, their formation can sometimes be evidenced by in-situ trapping experiments. However, is carbene-like reactivity genuine evidence of carbene formation? Herein, using the first example of a spectroscopically characterized cyclic (amino)(aryl)carbene (CAArC), we cast doubt on the most common carbene trapping reactions as sufficient proof of carbene formation.

中文翻译：

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真正的卡宾与类卡宾反应性

单线态卡宾并不总是可分离的，甚至常常无法直接检测。当它们逃避观察时，它们的形成有时可以通过原位捕获实验来证明。然而，类卡宾反应性是卡宾形成的真正证据吗？在此，使用光谱表征的环状（氨基）（芳基）卡宾（CAArC）的第一个例子，我们对最常见的卡宾捕获反应作为卡宾形成的充分证据表示怀疑。