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Draw the mechanism of the reaction, using bromine (Br2) as your brominating agent rather than pyridinium...

Draw the mechanism of the reaction, using bromine (Br2) as your brominating agent rather than pyridinium bromide perbromide.

There are two possible diastereoisomers of stilbene dibromide. draw both of them, and label each stereocenter (R) or (S)

Why is only one diastereomer formed in this reaction?

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