Structural Diversity of Lithium Sulfenamides: <sup>7</sup>Li NMR Studies in Solution and Crystal Structures of [Li<sub>2</sub>(η<sup>2</sup>-(CH<sub>3</sub>)<sub>3</sub>C−NS−C<sub>6</sub>H<sub>4</sub>CH<sub>3</sub>-4)<sub>2</sub>(THF)<sub>2</sub>] and [Li<sub>2</sub>(η<sup>1</sup>-4-CH<sub>3</sub>C<sub>6</sub>H<sub>4</sub>−NS−C<sub>6</sub>H<sub>4</sub>CH<sub>3</sub>-4)<sub>2</sub>(THF)<sub>4</sub>]
Bibliographic record
Abstract
Two lithium sulfenamides were prepared by reaction of (CH(3))(3)C-N(H)-S-C(6)H(4)CH(3)-4 (1) and 4-CH(3)C(6)H(4)-N(H)-S-C(6)H(4)CH(3)-4 (2) with an alkyllithium. The unsolvated sulfenamide Li[(CH(3))(3)C-NS-C(6)H(4)CH(3)-4] (3) was soluble enough for variable-temperature (VT) (7)Li NMR to provide evidence of a dynamic exchange of oligomers in solution. The crystal structures of the solvated sulfenamides of [Li(2)(eta(2)-(CH(3))(3)C-NS-C(6)H(4)CH(3)-4)(2)(THF)(2)] (4) and of [Li(2)(eta(1)-4-CH(3)C(6)H(4)-NS-C(6)H(4)CH(3)-4)(2)(THF)(4)] (6) consisted of dimers in which the anions display different hapticities. The VT (7)Li NMR spectra of 4 suggest that the two different structures exist in equilibrium in toluene-THF mixtures. These compounds are easily oxidized to the neutral thioaminyl radicals as identified by EPR spectroscopy.
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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 | 0.018 | 0.017 |
| Meta-epidemiology (narrow) | 0.037 | 0.044 |
| Meta-epidemiology (broad) | 0.033 | 0.018 |
| Bibliometrics | 0.013 | 0.029 |
| Science and technology studies | 0.018 | 0.023 |
| Scholarly communication | 0.009 | 0.018 |
| Open science | 0.023 | 0.023 |
| Research integrity | 0.028 | 0.036 |
| Insufficient payload (model declined to judge) | 0.001 | 0.004 |
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".