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R and S

Can someone teach me how they got R and R for first and second stereogenic centre I’m so lost for example 1
Reply 1
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Jshek
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8A58AD2D-9637-455C-A9EF-E7A6F509B3D8.jpeg
Original post by Jshek
Can someone teach me how they got R and R for first and second stereogenic centre I’m so lost for example 1

Can someone teach me how to rotate images through 90º so that they are readable without neck injury?
Position the stereo-centre so that the lowest priority group is at the back.

The other three groups now form a circle. Order them in terms of priority. If the order of decreasing priority is clockwise the chiral centre is "R" (rectus = right handed).

If the order shows an anticlockwise rotation it is designated "S" for sinister = left handed.

RS1.png
RS2.png
RS3.png
RS4.png
Reply 4
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Jshek
OP
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Original post by charco
Position the stereo-centre so that the lowest priority group is at the back.

The other three groups now form a circle. Order them in terms of priority. If the order of decreasing priority is clockwise the chiral centre is "R" (rectus = right handed).

If the order shows an anticlockwise rotation it is designated "S" for sinister = left handed.

RS1.png
RS2.png
RS3.png
RS4.png

image.jpg
I got a for sterogenic centre 2
Reply 5
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Jshek
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Original post by Jshek
image.jpg
I got a for sterogenic centre 2

S*
Original post by Jshek
image.jpg
I got a for sterogenic centre 2

Can't you post your images the right way up, it would make life a lot easier!
Original post by Jshek
S*

Actually, I just noticed that there are 2 typos in the images. I have put anticlockwise = R, when it should be "S".
Updated here:

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