Syntheses and characterisation of chloro(h3-allyl) dicarbonylmolybdenum(II) complexes of chiral and achiral ditertiaryphosphines
Bibliographic record
Abstract
Abstract A series of the complexes of the general formula [ClMo(CO)2(η 3-C3H5)(P-P)], [where (P-P) = (m-CH3C6H4)2P(CH2)2PPh2 (m-t-dppe); cis-Ph2PCH=CHPPh2 (cis-diphos); Ph2PCH2CH2AsPh2 (arsaphos); Ph2P(CH2)4PPh2 (dppb); (±)-1,2-C6H4(PMePh)2 (rac-diphos); (2R,3R)Ph2PC*H(Me)C*H(Me)PPh2 (+)-chiraphos; (R,R)-Me2C(O)2{C*HCH2PPh2}2 (-)-diop] were synthesised by the reaction of the precursor complex [ClMo(CO)2(η 3-C3H5)(CH3CN)2] with the corresponding ditertiary phosphine in acetone. The complexes were isolated as yellow to orange air-stable solids and characterised by elemental analyses, FTIR and multinuclear NMR [1H, 31P{1H}] spectroscopic techniques. The carbonyl force constant values were calculated by Cotton and Kraihanzel approximate secular equations using ν C≡O stretching frequencies observed in the FTIR and these were found to be 14.30–14.59 mdyne 0-A−1 and 0.23–0.70 mdyne Å−1 for K1 and Ki respectively. Spectroscopic evidences have confirmed cis-octahedral structures for the synthesized complexes.
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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".