Stereochemistry of meso compoudnscompounds

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occurred Jun 22, 2014 at 13:54

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asked Jun 19, 2014 at 13:33

Stereochemistry of meso compoudns

I got tripped up by this question; I thought these were all enantiomers when in fact they were all meso compounds.

How can one prevent this from happening?

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How does one rotate the Fischer projection, for example, in the first problem; I understand that one has to hold one group in place, but then what?

stereochemistry