A Continuous Manufacturing Line Generating Organozinc Species in Flow: Enhancing the Simmons-Smith Reaction Including Post-Reaction Processing
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide The cyclopropyl fragment is paramount in the pharmaceutical industry, as a wide range of active pharmaceutical ingredients inhere this versatile molecular structure. Recently, even higher importance has been attributed to the cyclopropane ring since many transition drug candidates utilize this carbon–carbon arrangement’s beneficial features. A reliable way to produce cyclopropanes is via the Simmons-Smith reaction, which utilizes a zinc–copper couple to transfer the methylene group of a dihalomethane to the double bond of a target molecule. The whole process involves a quenching and filtration step and is usually completed by a time-consuming extraction of metal salts and other impurities. This work presents a reliable and reproducible method to perform all unit operations continuously. It includes the synthesis step in a packed-bed reactor filled with a zinc–copper couple, activated in flow, eliminating the need for a filtration unit. It is followed by a two-stage cross-flow extraction for simultaneous quenching and removal of zinc salts from the product solution. Finally, the extraction efficiency is monitored atline by an in-house-developed method using chromophoric reagents in continuous flow.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.003 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".