Synthesis and thermal reactivity of organoscandium and yttrium complexes of sterically less bulky salicylaldiminato ligandsElectronic supplementary information (ESI) available: Further experimental details. See http://www.rsc.org/suppdata/dt/b3/b303097k/
Bibliographic record
Abstract
Scandium and yttrium bis(ligand) mono(alkyl) complexes, of N-phenyl (L1) N-2-isopropylphenyl (L2) and N-mesityl (L3) substituted ortho-tert-butylsalicylaldiminato ligands were prepared by alkane elimination from [M(CH2SiMe2R)3(THF)2] (R = Me, Ph) and two equivalents of proteo ligand (HL). The resulting [L2M(THF)n(CH2SiMe2R)] (n = 0–2, L = L1 (1), L2 (2), L3 (3)) complexes are thermally unstable, decomposing rapidly between −20 and 20 °C. In order to gain insight in to ligand features necessary to impart thermal stability in early transition metal organometallic chemistry, the decomposition pathways of 1–3 have been investigated and compared with more sterically congested N-2,6-diisopropylphenyl substituted analogues. Compounds 1 and 2 decompose rapidly and cleanly at room temperature by 1,3-migration of the entire CH2SiMe2R group to the aldimine carbon. By contrast, L3 mono(alkyls) 3 decompose cleanly by metallation of an ortho-C6H2Me3 group. In the case of yttrium, the metallated alkyl undergoes subsequent 1,3-migration to the aldimine carbon, forming a five-membered C4N-ring.
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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".