Bonus
Stephen Buchwald synthesized several widely used dialkylbiaryl variants of these molecules for cross-coupling reactions. For 10 points each:
[10h] Name these functional groups that can drive enantioselective reactions while complexed with ferrocene scaffolds as a part of Josiphos ligands.
ANSWER: phosphines [accept diphosphines or triphosphines]
[10m] Triphenylphosphine is added to a secondary alcohol alongside DEAD and an ester in this SN2 reaction named after a Japanese chemist.
ANSWER: Mitsunobu reaction
[10e] Phosphines are also used to define the Tolman cone angle, which is used to quantify the degree of this effect displayed by a ligand. Bulky groups physically block atoms from interacting in this effect.
ANSWER: steric hindrance [or sterics or steric effects or steric resistance or steric factor or steric strain; prompt on strain]
<Chemistry>
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Conversion
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total | Parts |
|---|---|---|---|---|---|---|
| Chicago A | Stanford | 10 | 10 | 10 | 30 | HME |
| Illinois A | Toronto A | 10 | 10 | 10 | 30 | HME |
| Waterloo A | Georgia Tech | 10 | 10 | 10 | 30 | HME |
Summary
| Tournament | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|
| 2025 ACF Nationals | Yes | 3 | 30.00 | 100% | 100% | 100% |