Stereoselective Coordination of Prochiral Olefins to Asymmetric Platinum(II) Complexes and a Diplatinum(II) Complex with a Single Unsupported Halide Bridge
Bibliographic record
Abstract
The chiral complexes [PtMe{ cis -1-(N CHC 6 H 4 )-2-(N CHPh)C 6 H 10 }], 1, and [PtMe{ trans -1-(N CHC 6 H 4 )-2-(N CHPh)C 6 H 10 }], 2, react with protic acids HBF 4 or [H(OEt 2 ) 2 ][BAr 4 ] (Ar = 3,5-(CF 3 ) 2 C 6 H 3 ) in the presence of olefin, with loss of methane, to give complexes of the type [Pt(η 2 -CH 2 CHR){ cis / trans -1-(N CHC 6 H 4 )-2-(N CHPh)C 6 H 10 }][BX 4 ] (R = H, Me, Ph, 4-Me-C 6 H 4; X = F, Ar). For prochiral olefins, R = Me, Ph, and 4-Me-C 6 H 4, highly stereoselective (90−95%) olefin coordination was demonstrated by using 1 H and 13 C NMR spectroscopy, and for the complex [Pt(η 2 -CH 2 CHPh){ cis- 1-(N CHC 6 H 4 )-2-(N CHPh)C 6 H 10 }][BF 4 ] by an X-ray structure determination. Olefin dissociation from [Pt(η 2 -CH 2 CHPh){ trans -1-(N CHC 6 H 4 )-2-(N CHPh)C 6 H 10 }][BAr 4 ] occurred in CD 2 Cl 2 to give the dinuclear complex [Pt 2 (μ-Cl){ trans -1-(N CHC 6 H 4 )-2-(N CHPh)C 6 H 10 } 2 ][BAr 4 ], and hydrolysis of [Pt(h 2 -CH 2 CH−C 6 H 4 -4-Me){ trans -1-(N CHC 6 H 4 )-2-(N CHPh)C 6 H 10 }][BF 4 ] gave PhCH O and [Pt(η 2 -CH 2 CH−C 6 H 4 -4-Me){ trans -1-(N CHC 6 H 4 )-2-(NH 2 )C 6 H 10 }][BF 4 ]. These are useful model compounds for intermediates in stereoselective alkene polymerization since they contain mutually cis alkenes and M−C σ-bonds.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.003 |
| 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) | 0.016 | 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".