5-Chloro-1-aza-5-stannabicyclo[3.3.3]undecane
Why this work is in the frame
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Bibliographic record
Abstract
(5-Chloro-1-aza-5-stannabicyclo[3.3.3]undecane) [93253-73-7] C9H18ClNSn (MW 294.41) InChI = 1S/C9H18N.ClH.Sn/c1-4-7-10(8-5-2)9-6-3;;/h1-9H2;1H;/q;;+1/p-1 InChIKey = BRPCJQRIZVVNKX-UHFFFAOYSA-M (precursor to organostannatranes that enable facile transfer of apical group due to intramolecular activation; selective alkyl transfer agent precursor) Alternate Name: 1-aza-5-chloro-5-stannabicyclo[3.3.3]undecane. Physical Data: mp 236–238 °C (EtOH),1 222–224 °C (MeOH).2 Solubility: soluble in Et2O, THF, EtOAc, CH2Cl2, and hexanes; slightly soluble in MeCN, MeOH, and i-PrOH; insoluble in H2O and aq. HCl. Form Supplied in: commercially available solid. Analysis of Reagent Purity: 13C and 119Sn NMR.3 Preparative Methods: initially prepared by transmetalation of N(CH2CH2CH2MgCl)34, 5 with SnCl4 in 12–15% yield. Subsequently, hydrozirconation of N(CH2CH–CH2)3 with Cp2ZrHCl followed by transmetalation with SnCl4 furnished 5-chloro-1-aza-5-stannabicyclo[3.3.3]undecane in 50% yield.2 Alternatively, 5-chloro-1-aza-5-stannabicyclo[3.3.3]undecane is prepared in 40% yield from N(CH2CH2CH2SnMe3)3 by thermal redistribution with Me2SnCl2.1, 5 N(CH2CH2CH2SnMe3)3 is synthesized by reacting N(CH2CH2CH2Cl)3 with Me3SnNa in liquid ammonia at −78 °C. Drawbacks to the preparation of chlorostannatrane by these routes are low yields, handling of volatile methyltin derivatives, harsh conditions, and/or expensive reagents. A scalable, two-step synthesis that remedies the former issues consists of the thermal redistribution of N(CH2CH2CH2SnBu3)3 with SnCl4 (eq 1). The tributylstannane N(CH2CH2CH2SnBu3)3 is accessible in 66% yield by the Pd/Al2O3-catalyzed hydrostannation of N(CH2CHCH2)3 with Bu3SnH, or alternatively, by the substitution of N(CH2CH2CH2Cl)3 with Bu3SnLi in 78% yield.6 (1) Purification: acid/base extraction6 or recrystallization from MeOH.2 Handling, Storage, and Precautions: toxic by ingestion and is a skin, eye, and respiratory tract irritant.7
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.075 | 0.001 |
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