Synthesis and Olfactory Properties of 2‐Substituted and 2,3‐Annulated 1,4‐Dioxepan‐6‐ones
Bibliographic record
Abstract
Abstract The synthesis and olfactory properties of a series of 2‐substituted and 2,3‐annulated 1,4‐dioxepan‐6‐ones is reported. By Williamson etherification with 3‐chloro‐2‐(chloromethyl)prop‐1‐ene (6) and subsequent Katsuki–Sharpless oxidation, 1,4‐dioxepan‐6‐one (8 a) and its 2‐methyl (8 b), 2‐propyl (8 c), 2‐isobutyl (8 d), and 2,2,3,3‐tetramethyl derivative (8 e), as well as four 2,3‐annulated 1,4‐dioxepan‐6‐ones 8 h, 8 i, 8 j, and 8 k were synthesised. By etherification with ethyl diazoacetate and subsequent Dieckmann cyclisation, (5aS,9aS)‐9‐bromo‐ and 9‐iodo‐5a,6,7,9a‐tetrahydro‐2 H‐benzo[b][1,4]dioxepin‐3(4 H)‐one (8 f/g) as well as a 2,3‐annulated derivative 8 m from (+)‐limonene were prepared. 2‐Propyl‐1,4‐dioxepan‐6‐one (8 c) was discovered to have a green floral odour with anisic and cinnamic nuances, which could be rationalised by a superposition analysis. The olfactory properties of the 1,4‐dioxepan‐6‐ones synthesised underline the crucial importance of a benzenoid ring system for marine odorants.
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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) | 0.002 | 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 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".