Sn1
Sn1-
Can generate is relatively stable carbon-left groups and the response of vulnerable SN1 , central carbon atom space hampered the response of small-prone SN2 .
能生成相对稳定的正碳离子和离去基团的反应物容易发生SN1，中心碳原子空间阻碍小的反应物容易发生SN2。
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In the reaction mechanism of unimolecular nucleophilic substitution ( SN1 ), it can produce carbocations which can easily lead to the racemization of the products .
由于单分子亲核取代反应（SN1）经过了碳正离子中间体的历程，所以得到的产物是外消旋的。