Stereochemistry Answers – Flashcards
Unlock all answers in this set
Unlock answersquestion
| If molecules have different stereochemistry, this means... |
answer
| that they have the same connections of atoms, but differ from one another by the orientation of those atoms in three-dimensional space. |
question
| Left |
answer
| S, sinister |
question
| Right |
answer
| R, rectus |
question
| Molecules with different stereochemistry are ___________ of each other. |
answer
| stereoisomers |
question
| What is a chiral center? |
answer
| A carbon atom with four different (unique) attached atoms or groups. |
question
| Cahn-Ingold-Prelog rules for assigning priority |
answer
| 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). |
question
| Assigning R and S configurations to chiral centers |
answer
| 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. |
