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Nucleophilic Substitution

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Winga:
Why weaker the base, better the leaving group?

Donaldson Tan:
i would tend to think weaker base in the sense that it would be less reactive, thus indicate higher stability to act as a leaving group

dexangeles:
less basic --> less nucleophilic --> better leaving group

Winga:
But, less basic doesn't mean that it must be less nucleophilic, right?

Mitch:
Maybe its because you don't want to encourage the competitive reaction of elimination.

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