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Confusing characteristic of a good leaving group?

 
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Nov3-12, 08:41 AM   #1
 

Confusing characteristic of a good leaving group?

I've read that a good leaving group should have the following two characteristics:

1) It should have a low energy α (i.e. empty) orbital

2) It should have a high energy σ (sigma) orbital

I get the first point but why the second?
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