TBR ochem book question

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mzblue

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I'm a little confused. In example 3.3 in chapter 3, the arrow goes from priority #1 to 3 and since #4 is in the back why is it an S stereocenter? why didn't the arrow go from priority 1 to priority #2 when #4 is already in the back? I'm talking about the third 2nd chiral center. why is it not 3R?
btw, it's on page 189.
thanks for your help.

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