Question
Nomenclature of these compounds usually involves the terms “syn” and “anti” that are preserved by rotation around a single bond. For 10 points each:
[10m] Name these organic compounds that have multiple chiral centers, but unlike meso compounds, are not superimposable on their mirror images.
ANSWER: diastereomers [or diastereoisomers; prompt on stereoisomers; reject “enantiomers”]
[10e] The diastereomer nomenclature terms “threo” and “erythro” come from examples of these compounds called threose and erythrose. Dextrose is an alternate name for right-handed glucose, which is one of these biomolecules.
ANSWER: sugars [or saccharides]
[10h] Diastereoselective reactions are governed by this phenomenon, observed in chiral ketones by Donald Cram. Nguyễn Trọng Anh incorporated the Burgi–Dunitz angle to Hugh Felkin’s model of this phenomenon.
ANSWER: asymmetric induction
<MY, Chemistry>
Summary
| California | 2025-02-01 | Y | 3 | 16.67 | 100% | 67% | 0% |
| Florida | 2025-02-01 | Y | 3 | 3.33 | 33% | 0% | 0% |
| Great Lakes | 2025-02-01 | Y | 6 | 10.00 | 50% | 50% | 0% |
| Lower Mid-Atlantic | 2025-02-01 | Y | 6 | 8.33 | 83% | 0% | 0% |
| Midwest | 2025-02-01 | Y | 6 | 11.67 | 83% | 17% | 17% |
| North | 2025-02-01 | Y | 3 | 10.00 | 67% | 33% | 0% |
| Northeast | 2025-02-01 | Y | 5 | 12.00 | 100% | 20% | 0% |
| Pacific Northwest | 2025-02-01 | Y | 2 | 5.00 | 50% | 0% | 0% |
| South Central | 2025-02-01 | Y | 2 | 15.00 | 100% | 50% | 0% |
| Southeast | 2025-02-01 | Y | 4 | 7.50 | 75% | 0% | 0% |
| Upper Mid-Atlantic | 2025-02-01 | Y | 9 | 10.00 | 67% | 33% | 0% |
| Upstate NY | 2025-02-01 | Y | 3 | 3.33 | 33% | 0% | 0% |
Data
| Vassar A | John Jay College | 0 | 10 | 0 | 10 |
| Yale A | Maryland A | 10 | 10 | 0 | 20 |
| Rutgers A | Maryland B | 10 | 0 | 0 | 10 |
| Johns Hopkins A | NYU A | 0 | 10 | 0 | 10 |
| Haverford B | NYU B | 0 | 10 | 0 | 10 |
| Penn A | Columbia C | 10 | 10 | 0 | 20 |
| Penn B | George Washington A | 0 | 0 | 0 | 0 |
| Columbia B | Cornell B | 0 | 10 | 0 | 10 |
| George Washington B | Haverford A | 0 | 0 | 0 | 0 |