Question
Reactants in this class of reactions are classified as suprafacial or antarafacial. For 10 points each:
[10m] Name this class of reactions that proceed via a cyclic transition state in a non-ionic and non-radical manner. Electrocyclic reactions and sigmatropic rearrangements are examples of this type of reaction.
ANSWER: pericyclic reactions
[10h] Like the similar Möbius–Hückel concept, these rules governing pericyclic reactions determine whether an interaction is symmetry-allowed. Orbital correlation diagrams aid in deriving these rules, which classify a thermal cyclization of 1,3-butadiene (“one-three b’yoo-tuh-DYE-een”) as conrotatory.
ANSWER: Woodward–Hoffmann rules
[10e] Conversely, the Woodward–Hoffmann rules predict that 1,3-butadiene follows a disrotatory mechanism when treated with this other input. Reactants driven by this stimulus are excited to higher energies by absorbing photons.
ANSWER: light [or UV light; or visible light; prompt on photochemical by asking “what is the stimulus?”]
<Chemistry>
Summary
| 2024 ACF Winter at UC Berkeley | 2024-11-16 | Y | 2 | 20.00 | 100% | 50% | 50% |
| 2024 ACF Winter at Lehigh | 2024-11-16 | Y | 1 | 10.00 | 100% | 0% | 0% |
| 2024 ACF Winter at Northwestern | 2024-11-16 | Y | 9 | 17.78 | 100% | 44% | 33% |
| 2024 ACF Winter at Online | 2024-11-16 | Y | 8 | 8.75 | 88% | 0% | 0% |
| 2024 ACF Winter at UBC | 2024-11-16 | Y | 3 | 13.33 | 100% | 0% | 33% |
| 2024 ACF Winter at Central Florida | 2024-11-16 | Y | 5 | 8.00 | 80% | 0% | 0% |
| 2024 ACF Winter at Oxford | 2024-11-16 | Y | 9 | 16.67 | 100% | 33% | 33% |
Data
| Stanford A | Berkeley B | 0 | 0 | 10 | 10 |
| Stanford L | Stanford M | 10 | 10 | 10 | 30 |