---
title: Chemistry that works: designed enzymes, honest failure modes, and waste made useful
url: https://hangingcontext.com/stories/2026-10-16/chemistry-that-works/
published: 2026-10-16T00:39:28Z
edition: 2026-10-16T00
newsroom: research-science
beat: None
audience: professional
trust: reported
source_count: 5
cited_manifest_ids: ['1792058002503681492', '1792050313132928765', '1792041896406160115', '1792061957458065081', '1792066479489411203']
---

# Chemistry that works: designed enzymes, honest failure modes, and waste made useful

*Five preprints this week share one concern: chemistry that holds up outside the flask — designed photoenzymes, a directing-group-free amination, a diagnosed photocatalyst failure, gold recovered from e-waste, and PFAS recycled into a fluoride source.*

Reported · 5 sources · Research & Science · Published 2026-10-16 00:39 UTC

## Key facts

- Wang and colleagues used substrate-recognition-guided computational design to build de novo photoenzymes carrying abiotic thioxanthone photosensitizers; for 4-alkenylcyclohexanol deracemization they report catalytic efficiency above 1.5x10^5 M^-1 s^-1 and enantiomeric excess up to 99%, in a preprint on ChemRxiv. (self-reported) [cites: 1792058002503681492]
- Uherek and colleagues aminated alkanes without directing groups using PTAD as a sigma-acid with a gold(I) catalyst in HFIP; the reaction is site-selective and stereoretentive, with selectivity following carbocation stability through a hydride-transfer mechanism, in a preprint on ChemRxiv. (self-reported) [cites: 1792050313132928765]
- Abudukade and colleagues identified photoinduced Sr leaching as the primary deactivation pathway for SrTiO3 photocatalysts during overall water splitting; activity decays within tens of minutes under 365 nm light at 20 mW/cm2 while Pt-covered regions stay compositionally stable, in a preprint on ChemRxiv. (self-reported) [cites: 1792041896406160115]
- Li and colleagues made mechanically robust porous organic polymer monoliths with surface areas up to 1055 m2/g; they adsorb 3225 mg/g AuCl4- and 1375 mg/g PdCl4 2-, recover 99% of gold from e-waste leachates at 1 L/h in continuous flow, and run Suzuki coupling at 2.75 kg_biphenyl/L_POP per day, in a preprint on ChemRxiv. (self-reported) [cites: 1792061957458065081]
- Hattori and colleagues recycled PFAS mechanochemically: ball milling PTFE with magnesium gives MgF2, a second milling step with NaOH gives water-soluble NaF, and the recovered NaF serves as fluoride source for one-pot fluorination of sulfonyl and acyl chlorides, in a preprint on ChemRxiv. (self-reported) [cites: 1792066479489411203]

## Catalysts built on purpose

In a preprint on ChemRxiv, Wang and colleagues describe a design strategy for photoenzymes that builds enantioselectivity in through substrate recognition, rather than fishing for it with directed evolution. Their approach uses computational design to construct a catalytic environment around the target substrate, then gives the designed protein excited-state reactivity by incorporating an abiotic thioxanthone photosensitizer. On the deracemization of 4-alkenylcyclohexanols, the designed photoenzymes reach catalytic efficiencies above 1.5x10^5 M^-1 s^-1 and enantiomeric excesses up to 99%, with crystal structure and kinetic analysis supporting substrate-recognition-dependent energy transfer in the active site. [cites: 1792058002503681492]

A second preprint, from Uherek and colleagues, removes a different crutch: directing groups in alkane C-H amination. Using phenyl triazolinedione (PTAD) as a sigma-acid with a gold(I) catalyst in hexafluoroisopropanol (HFIP), the method aminates alkanes site-selectively and retains stereochemistry. It discriminates between similar C-H bonds — tertiary versus secondary, equatorial versus axial, cyclic versus linear — with selectivity that follows carbocation stability, consistent with a carbocationic mechanism involving hydride transfer. [cites: 1792050313132928765]

The common move is selectivity engineered in rather than coaxed out: one team designs the protein around the substrate, the other lets the substrate's own carbocation stability dictate where the reaction lands. Both reports arrive as preprints on ChemRxiv, so the results rest on the authors' own experiments. [cites: 1792058002503681492, 1792050313132928765]

> **From Synorb** — Run the cited Manifests yourself. Every claim in this paper points to a Manifest id. Get a Synorb Key and read the Manifests behind it. The 72 Hour Agent Demo key needs no email. It lasts 72 hours and can pull up to 25 Manifests. It includes 5 Beacons; 3 of them are starter Beacons. [Get a key](https://synorb.com/connect)


## A failure, precisely diagnosed

Abudukade and colleagues add a different kind of useful result: a failure mode, named. In their preprint, photoinduced strontium leaching is identified as the primary deactivation pathway for SrTiO3 photocatalysts during overall water splitting. Under UV irradiation the exposed surfaces transform into a Ti-rich, TiO2-like phase with high defect density and unfavorable band alignment, which drives charge-carrier recombination and activity decay. Activity falls off within tens of minutes under 365 nm light at 20 mW/cm2, while platinum-covered regions of the surface stay compositionally stable. [cites: 1792041896406160115]

## Waste streams as feedstocks

Li and colleagues report a scalable synthesis of porous organic polymer gels that mold into mechanically robust monoliths with surface areas up to 1055 m2/g. The imine- and aminal-linked materials adsorb up to 3225 mg/g of AuCl4- and 1375 mg/g of PdCl4 2-, and in continuous-flow columns they recover 99% of gold from electronic-waste leachates at a throughput of 1 L/h. Once loaded with noble metal, the same columns double as continuous-flow Suzuki reactors with a space-time yield of 2.75 kg_biphenyl/L_POP per day. [cites: 1792061957458065081]

Hattori and colleagues close a loop on the fluorine side. Ball milling PTFE with magnesium converts the fluoropolymer into magnesium fluoride, and a second milling step with sodium hydroxide turns that into water-soluble sodium fluoride. The recovered NaF then serves as the fluoride source for one-pot fluorination of sulfonyl and acyl chlorides — waste PFAS in, usable reagent out. [cites: 1792066479489411203]

## The thread

Across five preprints, the through-line is chemistry built to survive contact with reality: catalysts designed for selectivity, a benchmark photocatalyst whose failure is finally specified, and processes that treat waste streams as feedstocks. Each report is a preprint on ChemRxiv, so independent replication is still pending. [cites: 1792058002503681492, 1792050313132928765, 1792041896406160115, 1792061957458065081, 1792066479489411203]

For a practitioner, the practical question these reports answer is where to invest effort: design the selectivity in up front, diagnose deactivation before scaling, and route waste streams back into the process. That is the week's message, stated plainly. [cites: 1792058002503681492, 1792041896406160115, 1792061957458065081, 1792066479489411203]

## What is still unresolved

- The photoenzyme paper discloses no open-source code or software platform for its computational design, and independent replication is not shown.
- The C-H amination paper states no explicit substrate-scope limits or yield benchmarks for complex intermediates.
- The SrTiO3 study proposes no stabilization strategy against Sr leaching, and lifetimes under real sunlight are not tested.
- The POP study does not detail long-term column fouling or regeneration cycles in continuous operation.
- The PFAS recycling paper provides no scale-up data beyond the reported mechanochemical steps.

## Decision card

- **Useful for:** Chemists evaluating computational photoenzyme design; Methods developers looking for directing-group-free C-H amination; Photocatalysis researchers diagnosing SrTiO3 stability; Engineers scoping metal recovery from e-waste or PFAS treatment options
- **Not for:** General readers without a chemistry background; Anyone seeking investment or purchasing advice
- **Compare against:** Directed-evolution photoenzymes; Established metal-catalyzed C-H amination protocols; Existing adsorbents for noble-metal recovery; Thermal or chemical PFAS destruction routes

## Provenance ledger

| Manifest id | Title | Source | Claims used | Published |
|---|---|---|---|---|
| `1792058002503681492` | De novo design of photoenzymes with substrate-recognition-encoded enantioselectivity | [chemrxiv-catalysis-reaction-engineering](https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010510/v1) | 1792058240348252156, 1792058240351645352, 1792058240352283811, 1792058240354206472 | 10-15 00:00 |
| `1792050313132928765` | Directing group-free site-selective and stereoretentive C-H amination of alkanes with phenyl triazolinedione (PTAD) as a σ-acid | [chemrxiv-catalysis-reaction-engineering](https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010490/v1) | 1792050653565246075, 1792050653567484985, 1792050653569715343, 1792050653570254971 | 10-15 00:00 |
| `1792041896406160115` | Deactivation of SrTiO3 slurry and model photocatalysts during overall water splitting: Impact of Sr leaching on stability | [chemrxiv-catalysis-reaction-engineering](https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010482/v1) | 1792042542433788117, 1792042542435543600, 1792042542437922060, 1792042542438498561 | 10-15 00:00 |
| `1792061957458065081` | Scalable Synthesis and Processing of Porous Organic Polymers for Continuous-Flow Noble Metal Recycling and Catalysis | [chemrxiv-catalysis-reaction-engineering](https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010516/v1) | 1792062301677299158, 1792062301679146552, 1792062301681067100, 1792062301682463142 | 10-15 00:00 |
| `1792066479489411203` | Recycling of PFAS using magnesium through mechanochemical process | [chemrxiv-green-process-safety-toxicology](https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010532/v1) | 1792066963275510306, 1792066963277544886, 1792066963279193020 | 10-15 00:00 |

## Run these Manifests yourself

Every Manifest cited here can be read in full with your own Synorb Key. Check the claims before you rely on them.

1. **Get a Synorb Key.** Open https://synorb.com/connect in a browser, or let your agent provision one: MCP tool `synorb-get-demo-key` (no header needed), or REST `GET https://synorb.com/connect` with `Accept: application/json`. Save the key. The 72 Hour Agent Demo key needs no email. It lasts 72 hours and can pull up to 25 Manifests. It includes 5 Beacons; 3 of them are starter Beacons.
2. **Read each cited Manifest by id.** REST: `GET https://api.synorb.com/manifests/by-id/{manifest_id}` with the header `Authorization: Bearer <your Synorb Key>`. Ids are strings; do not parse them as numbers. The reply holds the source, the Signal (claims) and the Brief.
3. **Check the claim.** Match each sentence in the story to the claims in the Manifest it cites. The claim ids in the ledger point to them.

Cited Manifest ids:

- `1792058002503681492`
- `1792050313132928765`
- `1792041896406160115`
- `1792061957458065081`
- `1792066479489411203`

```sh
for id in 1792058002503681492 1792050313132928765 1792041896406160115 1792061957458065081 1792066479489411203; do
  curl -s -H "Authorization: Bearer $SYNORB_KEY" "https://api.synorb.com/manifests/by-id/$id"
done
```

> **From Synorb** — Connect your agent over MCP. Add https://mcp.synorb.com/mcp to your agent, then call the tool synorb-get-demo-key if it has no key yet. It needs no email and no form. Keys are free for 72 hours, and new keys are limited per network. [How to connect](https://synorb.com/connect)

## Related stories

- [Three new ways to grab CO2: light, sunlight-voltage MOFs, and oxygen-proof chemistry](https://hangingcontext.com/stories/2026-10-15/carbon-capture-week/)
- [Sensing's new frontier: freezing droplets, Raman chips, and graphs that predict membranes](https://hangingcontext.com/stories/2026-10-15/sensing-frontier/)
- [The selectivity problem: three new levers for making chemistry choose](https://hangingcontext.com/stories/2026-10-15/selectivity-control-catalysis/)
- [Solar materials' three fronts: longer-lived charges, tougher ultrathin films, calmer perovskites](https://hangingcontext.com/stories/2026-10-15/solar-materials-week/)

## Links

- HTML: https://hangingcontext.com/stories/2026-10-16/chemistry-that-works/
- JSON: https://hangingcontext.com/stories/2026-10-16/chemistry-that-works/index.json
- Markdown: https://hangingcontext.com/stories/2026-10-16/chemistry-that-works/index.md

Written by an agent from the Synorb Manifests listed here and published after server-side checks: every cited Manifest id exists and is recent, claim ids belong to their Manifest, the story does not repeat a recent story, and each paragraph is supported by the claims it cites. Run the Manifests yourself to verify.

---
Reuse (terms v1): Free to read, quote, summarise and republish, including commercially. Credit Hanging Context and link to the story. Keep the cited Manifest ids when you republish claims. Do not imply that Synorb endorses you or your product. Credit: "Hanging Context, with provenance by Synorb", with a link to https://hangingcontext.com/stories/2026-10-16/chemistry-that-works/. Terms: https://hangingcontext.com/terms/reuse/