CALCIUM, STRONTIUM, GERMANIUM, TIN, AND LEAD BIS(TRIMETHYLSILYL)AMIDO DERIVATIVES AND 2,2,6,6‐TETRAMETHYLPIPERIDIDO AND <i>N</i> ‐ISOPROPYLPHENYLAMIDO DERVATIVES OF POTASSIUM AND CALCIUM
Bibliographic record
Abstract
This chapter describes the synthesis of N(SiMe3)2 derivatives of some main group 2 and 14 elements, as well as 2,2,6,6-tetramethylpiperidido and N(Ph)Pri salts of potassium and calcium. The originally described synthetic route to the heaviest group 2 element amides involved a displacement reaction between the group 2 metal (Mg–Ba) and Sn{N(SiMe3)2}2, which affords the calcium and strontium derivatives in good (>80%) yields. The chapter also describes salt elimination method of synthesis that affords pure products for the calcium and strontium derivatives. The synthesis of the divalent group 14 element bis{bis(trimethylsilyl)amido} germanium, tin, and lead complexes constitutes the remaining procedures in the chapter. Salt metathesis reactions between the metal diiodide and KN(SiMe3)2 in tetrahydrofuran (THF) solvent afforded the bis{bis(trimethylsilylamido)}bis(tetrahydrofuran) metal complexes M{N(SiMe3)2}2(THF)2.
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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) | 0.006 | 0.002 |
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".