The SN1 reaction takes place in two steps:
An example reaction:
This gives the overall reaction:
SN1 occurs where the central carbon atom is surrounded by bulky groups. The rate depends only on the concentration of the substrate.
Nucleophilicity is irrelevant in the determining step's rate, in which only the substrate is crucial.
Because the intermediate cation, R+, is planar, an optically active[?] substrate gives a racemic mixture because nucleophilic attack[?] can occur from either side.
... the blood to the right side of the heart.
There is one exception to this general picture: the capillaries in the intestines lead to the portal vein which, instead of ...
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