# R and S

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Thread starter 1 month ago
#1
Can someone teach me how they got R and R for first and second stereogenic centre I’m so lost for example 1
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Thread starter 1 month ago
#2
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1 month ago
#3
(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?
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1 month ago
#4
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.

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Thread starter 1 month ago
#5
(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.

I got a for sterogenic centre 2
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Thread starter 1 month ago
#6
(Original post by Jshek)

I got a for sterogenic centre 2
S*
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1 month ago
#7
(Original post by Jshek)

I got a for sterogenic centre 2
Can't you post your images the right way up, it would make life a lot easier!
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1 month ago
#8
(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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