Synthesis, Structure, and Reactivity of an Unusual Platinum Olefin Carbene Complex, [(η<sup>4</sup>-cod)Pt{C(Ph<sub>2</sub>PNSiMe<sub>3</sub>)<sub>2</sub>-κ<i>C</i>,κ<i>N</i>}]
Why this work is in the frame
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Bibliographic record
Abstract
The organolithium dimer [Li 2 C(Ph 2 P NSiMe 3 ) 2 ] 2 ([Li 2 - 1 ] 2 ) reacts with 2 equiv of [PtCl 2 (cod)] (cod = 1,5-cyclooctadiene) in Et 2 O solution to give the novel Pt−carbene complex [(η 4 -cod)Pt{ C(Ph 2 P NSiMe 3 ) 2 -κ C,κ N }] ( 2 ), which is characterized by a relatively long Pt−C(carbene) bond and relatively short Pt−C(olefin) interactions indicative of an electron-rich Pt center. Under oxygen- and moisture-free conditions, 2 is remarkably inert; the cod ligand is not displaced by either monodentate or bidentate phosphines, phosphine sulfide, phosphite, or pyridine at room temperature, nor is the four-membered C,N-chelate ring opened by these reagents. However, 2 reacts with the electrophiles MeOTf (OTf = trifluoromethanesulfonate) and CO 2 . In the former case, the uncoordinated N atom of 2 is methylated to form [(η 4 -cod)Pt{ C(Ph 2 P NSiMe 3 )(Ph 2 P N(Me)SiMe 3 -κ C,κ N }][OTf] ( 3 ). In the latter, initial nucleophilic attack by the uncoordinated N atom on CO 2, followed by trimethylsilyl group migration from N to O, gives [(η 4 -cod)Pt{ C(Ph 2 P NSiMe 3 )(Ph 2 P NC(O)OSiMe 3 -κ C,κ N }] ( 4 ). Heating a benzene solution of 2 to 100 °C in a sealed tube for several hours, or to 60 °C for 10 min in the presence of H 2 O, yields the ortho-metalated complex [(η 4 -cod)Pt{CH(Ph(C 6 H 4 )P NSiMe 3 )(Ph 2 P NSiMe 3 )-κ C,κ C ‘ }] ( 5 ), which is characterized by Pt−C distances that are in the typical range for Pt−C(alkyl) and Pt−C(arene) interactions. The diastereoselectivity of the ortho metalation is consistent with an oxidative addition (nucleophilic) reaction mechanism for the ortho metalation. In contrast to 2, 5 displays typical cod substitution reactivity with chelating phosphines. The reaction between [Li 2 - 1 ] 2 and [PtCl 2 (cod)] in C 6 H 6 solution proceeds only very slowly and gives [Li][Pt{CH(Ph(C 6 H 4 )P NSiMe 3 )(Ph 2 P NSiMe 3 )-κ C,κ C ‘ }{CH(Ph 2 P NSiMe 3 ) 2 -κ C,κ N }] ( 7 ) in low yield.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it