Direct Observation of Phenoxy as the Key and Common Intermediate for the Decomposition of Lignin Fragments Containing the β-O-4 Linkage
Bibliographic record
Abstract
The decomposition of phenol, anisole, and 2-phenoxyethanol on Pt(111) in ultrahigh vacuum is studied as a model to understand the reactivity of the β-O-4 linkage in lignin. Desorption of the multilayer and monolayer is observed as well as the generation of decomposition products. Using RAIRS to monitor the vibrational signatures of all the species, we observed the appearance of the characteristic 1480 cm –1 vibration for the phenoxy group. This, in conjunction with changes in other bands, is used to identify the phenoxy species (as opposed to the oxocyclohexadienyl moiety) as the common key intermediate in the decomposition of the three molecules. The nature of the phenoxy species is discussed in comparison with previous literature and may lead to insight into the reaction–product selectivity of the decomposition.
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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 | 0.000 | 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) | 0.002 | 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 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".