Hydroxymethylaniline Photocages for Carboxylic Acids and Alcohols
Bibliographic record
Abstract
ortho -, meta - and para -Hydroxymethylaniline methyl ethers 3–5-OM e and acetyl derivatives 3–5-OAc were investigated as potential photocages for alcohols and carboxylic acids, respectively. The measurements of photohydrolysis efficiency showed that the decaging from ortho - and meta -derivatives takes place efficiently in aqueous solution, but not for the para -derivatives. Contrary to previous reports, we show that the meta -derivatives are better photocages for alcohols, whereas ortho -derivatives are better protective groups for carboxylic acids. The observed differences were fully disclosed by mechanistic studies involving fluorescence measurements and laser flash photolysis (LFP). Photoheterolysis for the para -derivatives does not take place, whereas both meta - and ortho -derivatives undergo heterolysis and afford the corresponding carbocations 3-C and 4-C . The ortho -carbocation 4- o -C was detected by LFP in aqueous solution (λ max = 410 nm, τ ≈ 90 μs). Moreover, spectroscopic measurements for the meta -acetyl derivative 3- m -OAC indicated the formation of cation in the excited state. The application of an ortho- aniline derivative as a protective group was demonstrated by synthesizing several derivatives of carboxylic acids. In all cases, the photochemical deprotection was accomplished in high yields (>80%). This mechanistic study fully rationalized the photochemistry of aniline photocages which is important for the design of new photocages and has potential for synthetic, biological, and medicinal applications.
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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 | 0.000 |
| 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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; a candidate call from one teacher head, 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".