In 1953, theoretical physicist Charles Frank published a paper laying out three conditions required for a chemical system to spontaneously produce an excess of one mirror-image molecule: a chiral catalyst driving an asymmetric reaction, a mechanism where formation of one mirror image is enhanced while the other is inhibited, and autocatalysis, where the reaction product feeds back to make more of the catalyst, creating a runaway effect. The hosts explain that by the early 2000s chemists had already satisfied the first condition through asymmetric catalysis, but the inhibition and autocatalysis conditions remained unfulfilled until the discoveries honored by the 2026 Nobel Prize.
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Frank's paper was written in response to a colleague asking for a mathematical roadmap to explain chemistry's inability to account for life's molecular handedness.
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The hosts note Frank's dismissive, theorist's tone, including his remark that a laboratory demonstration 'may not be impossible.'
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Willy Markwald is credited with achieving Frank's first condition (chiral catalyst, asymmetric reaction) at the start of the 20th century.
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The 2001 Nobel Prize (Knowles, Noyori, Sharpless) and 2021 Nobel Prize (List, MacMillan) are cited as prior recognition of asymmetric catalysis, including its industrial use in making L-DOPA.
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Frank's paper became a widely circulated open problem that university lecturers posed to students.
665 words · auto-generated from the episode video
24:35This brings us to 1953. There's an article by Charles Frank from the University of Bristol. I should say Sir Charles Frank because he was knighted. He's a fellow of the Royal Society. And he is a theoretical physicist who a colleague describes to him the fact that chemistry and chemists can't really understand why life's asymmetry arose. And maybe a mathematical solution or at least a roadmap to understanding this problem would be nice. And so Charles Frank writes this paper and it's kind of a, it's a classic theoretical physicist paper of this is trivial. He's the kind of theoretical physicist that everyone hates, especially the experimentalist.
25:20Okay, like in his introduction, he talks about how like, you know, this is guys. Why are you wasting my time? Yeah yeah. And he responds with three categories that we need to establish in order to make something like an asymmetry like this happen. The first one is that there is a chiral catalyst and an asymmetric reaction. That's the kind that was, that we had just discussed from Willie Markwald. The second stipulation is that the formation of one of the mirror images is somehow enhanced and the other is dampened. This means that there's an inhibition of types.
26:03Okay, you're not just making both. Somehow the presence of one is making the other one worse. Okay, and the third is that the chemical reaction has to form the catalyst itself. You need a runaway reaction. You need the product itself to go back into the reaction and feed in so you get this nonlinear effect. So he's putting out a roadmap, okay? That last part is called autocatalysis and that's the self-reinforcing effect. And Frank concludes his report by just laconically noting that a laboratory demonstration may not be impossible. Like really? Yeah yeah. This is something that classic theoretical physicists do. It's like, oh, why don't you just
26:45figure it out? Just go do it. Yeah. Like, what are you asking me for? Yeah, it's like, oh really? Okay nice. Well, his paper does make waves because now we've got kind of a roadmap on how to get there, right? And it's spread widely among chemists. It becomes kind of a chemical puzzle that university lecturers present to their students. Like this is an open problem. Let's see if you guys can figure it out. Now Markwald, as I said, had already succeeded at the start of the 20th century. And autocatalysis, asymmetric catalysis, is also something that has been figured out. The 2001 Nobel Prize in chemistry recognized William Nol's Rio G.
27:26Noyori and Barry Sharpless for important chiral catalytic reactions. This is the autocatalysis that we're talking about. And that led to the industrial route to L-DOPA, which is a pharmaceutical that's used pretty widely. And in 2021, the Nobel Prize recognized Benjamin List and our favorite chemist on the podcast, David Macmillan from Princeton University. Go Tigers. They created asymmetric organocatalysis. So organic chemistry that preferred one way or the other, right? All of that is fine.
28:06The Nobel Prize in chemistry this year recognizes the fulfillment of the remaining two conditions, meaning you need inhibition, and you need that inhibition paired with catalysis, this runaway reaction, okay? We big, so, and just so, in nature, there's this 50-50 thing, where it happens naturally where it's not asymmetric. And through 2021, we had all of these different ways to artificially create an asymmetry. But the thing was, to fulfill sort of the ultimate vision, we still had two missing variables. Yeah. And those specifically are the difference between the past Nobel Prizes and this Nobel Prize.
28:48Exactly. In this particular Nobel Prize, we are establishing the nonlinear effect, which is this sort of property that like, I can get more asymmetry from underlying asymmetry, and the fact that we can have a runaway reaction. That autocatalysis part, okay? So, to make that question measurable, there's one scientific sort of,
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