Single Molecule Absolute Chirality Determination, Isomerization, and Asymmetric Induction at a Silicon Surface
Bibliographic record
Abstract
STM is used to identify and discriminate between adsorbed molecules differing only in the geometric configuration of methyl groups. The absolute configuration (either R or S) for each newly formed asymmetric centre is identified. The degree of stereoselectivity of the reaction of 2-butene with the Si(100) surface is also been studied. A small degree of isomerization is observed, indicating that the reaction, although 98% stereoselective, is not stereospecific. This implies that the [2+2] cycloaddition reactions of alkenes on this surface proceed in a step-wise manner with the time scale between formation of the two Si-C bonds on the order of a few picoseconds. We show the first example of an enantiospecific reaction with a silicon surface. 1S(+)-3-carene adsorption on the Si(100) surface results in the formation of a chiral surface.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 teacher head, 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".