Stereochemistry Answers – Flashcards
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| What is a chiral center? |
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| A carbon atom with four different (unique) attached atoms or groups. |
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| Cahn-Ingold-Prelog rules for assigning priority |
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| Use to assign R or S configuration. Prioritize using numbers 1-4. Highest priority goes to the group whose first atom has the highest atomic number. Double and triple bonds expanded into equivalent number of single bonds (C tripled bonded to N counts as C connected to three N). |
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| Assigning R and S configurations to chiral centers |
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| 1) Rotate the molecule so the fourth-priority substituent is in the back (on a dashed bond sticking back into the paper). 2) Draw a curve from the first- to second - to third-priority substituent: is clockwise, R, if counterclockwise, S. |
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