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Chapter 1 - R/S – absolute configuration o Assign...

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Chapter 5 – Stereochemistry Chirality o For a carbon to be chiral, it must have four different groups bonded to it Must be tetrahedral, but that’s necessary for the above to be true anyway. chiral achiral C C CH 3 CH 3 Cl Br H H Br H Thus, CH 3 or CH 2 will never be chiral The groups do not have to be different atoms C This means that if a carbon has a methyl, ethyl, propyl, and butyl group coming off it, then it is chiral, even though it has four carbons attached to it.
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Unformatted text preview: R/S – absolute configuration o Assign priorities to all the atoms coming off the chiral carbon one atom at a time o 1 2 3 4 H Br Based on Mass, not electronegativity • The heaviest atom is given priority #1 o If there’s a tie, go out one more atom o Then, make sure your lowest priority atom is facing away from you o Make a circle from 1 to 2 to 3...
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