I. Attempted synthesis and characterisation of an electron-deficient transition metal complex potentially useful in carbon-hydrogen bond activation. II. Investigations of mesoporous niobium oxide - cobaltocene composites: The first example of superparamagnetism in molecule-based clusters.
Bibliographic record
Abstract
The attempted syntheses of electron deficient transition metal complexes proposed to be useful in C--H bond activation processes are reported. Because tris(trimethylsilyl)methane (HTsi) is sterically demanding but only donates one electron, we were interested in synthesising transition metal complexes with this ligand, under the assumption that these traits would be important in designing an extremely electron deficient transition metal complex for use in C--H bond activation processes. By means of three synthetic approaches, nucleophilic attack, oxidative addition and free radical reactions, the syntheses of several ligand complexes, Ir(Tsi)I(CO)(PPh3) 2, Rh(Tsi)I(CO)(PPh3)2, RhSiTsi(PPh3) 3, Ir(SiTsi)CO(PPh3)2, MnSiTsiCl, NbCl4Tsi, TaCl4Tsi, ZrCl3Tsi and TaMe3ClTsi) were attempted but most products were intractable. The isolation and characterisation via 1H NMR spectroscopy of a Ru--H species, (RuClH(C6H 5Tsi)PPh3), formed from the direct reaction of RuCl(Tsi)(C 6H6)PPh3 with LiTsi, is discussed. The characterisation of, and hypothesised mechanistic pathway towards a novel organic material, benzyl-Tsi, formed during the course of our investigations, is also reported. Source: Masters Abstracts International, Volume: 40-03, page: 0708. Adviser: David Antonelli. Thesis (M.Sc.)--University of Windsor (Canada), 2001.
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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) | 0.001 | 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".