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Consider this hypothetical molecule. Assign the priorities, rotate into the correct orientation and decide if it is R or S.
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Step 1
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Assign the atoms numbers 1 to 4 based on highest atomic number. In this example chlorine has the highest atomic number and is assigned 1 whereas hydrogen has the lowest atomic number and is assigned 4 |
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Step 2
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Arrange the molecule so that the lowest priority substituent faces backwards in this case number 4 |
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Step 3
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Mentally move from substituent 1 to 2 to 3. If you are moving clockwise assign the label R. If anticlockwise assign the label S |
R as clockwise
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