Vinylidene, allenylidene, cyclic oxycarbene, and η<sup>2</sup>-alkyne complexes from reactions of (η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)OsCl(PPh<sub>3</sub>)<sub>2</sub> with alkynes and alkynols
Bibliographic record
Abstract
Reactions of Cp*OsCl(PPh 3 ) 2 (Cp* = pentamethylcyclopentadienyl) with alkynes and alkynols are described. Treatment of Cp*OsCl(PPh 3 ) 2 with phenylacetylene and trimethylsilylacetylene gave the vinylidene complexes Cp*OsCl(=C=CHPh)(PPh 3 ) and Cp*OsCl(=C=CH 2 )(PPh 3 ), respectively. Treatment of Cp*OsCl(PPh 3 ) 2 with the internal alkyne dimethyl acetylenedicarboxylate produced the η 2 -alkyne complex Cp*OsCl(η 2 -MeO 2 C≡CCO 2 Me)(PPh 3 ). Treatment of Cp*OsCl(PPh 3 ) 2 with the propargylic alcohol HC≡CC(OH)Ph 2 gave the osmium allenylidene complex Cp*OsCl(=C = C=CPh 2 )(PPh 3 ). The outcomes of the reactions of Cp*OsCl(PPh 3 ) 2 with ω-alkynols HC≡C(CH 2 ) n OH are dependent on the length of the -(CH 2 ) n - linker. The reaction with 3-butyn-1-ol produced the cyclic oxycarbene complex Cp*OsCl{=C(CH 2 ) 3 O}(PPh 3 ) exclusively. The reactions with 4-pentyn-1-ol produced a mixture of the hydroxyalkyl vinylidene complex Cp*OsCl{=C=CH(CH 2 ) 3 OH}(PPh 3 ) and the cyclic oxycarbene complex Cp*OsCl{=C(CH 2 ) 4 O}(PPh 3 ) in about 10:1 molar ratio. The reaction with 5-hexyn-1-ol gave exclusively the hydroxyalkyl vinylidene complex Cp*OsCl{=C=CH(CH 2 ) 4 OH}(PPh 3 ).
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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.002 | 0.003 |
| 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 itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
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".