Question

Why is this S, shouldn't it be R? The (O,O,C) is higher priority.

http://www.tiikoni.com/tis/view/?id=32f56d1

Answer 1

you need the C-H bond to face AWAY from you, so switch 1 with 4 first

Answer 2

now the 1,2,3 is decreasing clockwise, so R, BUT we did one switch , so switch back gives S

Answer 3

Thank you

Answer 4

sorry I mean increasing as in 1 to 2 to 3 but you get the idea