Friday, 22 February 2013

How to assign R and S configurations when the lowest priority group isn' t facing away?

I can normally assign R and S but I'm having mixed results when I try adn rotate the molecule so that the lowest priority group is facing away from me.
Can anyone help me with a method to help rotate successfully?
I get the substituent priorities correct, it's only trying to arrange it so that the 4th group is away.
Thank you.

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