Evidence for singlet state β cleavage in the photoreaction of α-(2,6-dimethoxyphenoxy)-acetophenone inferred from time-resolved CIDNP spectroscopy

Research output: Journal contributionsJournal articlesResearchpeer-review

Authors

The photochemistry of α-(2,6-dimethoxyphenoxy)-acetophenone (1) was studied using CIDNP spectroscopy; an XeCl excimer laser (308 nm) and a 250 MHz 1H nuclear magnetic resonance (NMR) spectrometer were employed. The results are compared with the photoreactions of α-hydroxyacetophenone (2) and α-methoxyacetophenone (3). The CIDNP spectra of 1 can be interpreted as a result of a β cleavage from the singlet state. With time-resolved CIDNP spectroscopy it is possible to detect the enol of acetophenone in a second reaction path and to observe the tautomerization to acetophenone. Evidence is presented that this reaction path starts with the photoreduction of 1 from the triplet state. Compound 2 shows α cleavage from the triplet state and no β cleavage. As expected no CIDNP spectra are observed from 3 which is known to react via a Norrish type II mechanism.

Original languageEnglish
JournalJournal of Photochemistry and Photobiology, A: Chemistry
Volume52
Issue number3
Pages (from-to)439-450
Number of pages12
ISSN1010-6030
DOIs
Publication statusPublished - 01.06.1990
Externally publishedYes

Recently viewed

Publications

  1. Cognitive load in reading a foreign language text with multimedia aids and the influence of verbal and spatial abilities
  2. Reducing problematic alcohol use in employees: economic evaluation of guided and unguided web-based interventions alongside a three-arm randomized controlled trial
  3. Simulation of stresses during casting of binary magnesium-aluminum alloys
  4. Diverse values and a common utopia
  5. A Statistical Approach to Estimate Spatial Distributions of Wet Deposition in Germany
  6. Forced exit from the joint-decision trap
  7. Tree cover mediates the effect on rapeseed leaf damage of excluding predatory arthropods, but in an unexpected way
  8. Does Allulose Appeal to Consumers? Results from a Discrete Choice Experiment in Germany
  9. If you call for frameworks in sustainability management... editorial to the special issue
  10. OPERATIONALIZING DIGITAL TRANSFORMATION FROM MULTIPLE PERSPECTIVES
  11. Reading instruction in 5th grade: teachers’ perspectives on promoting self-regulated reading in language and content area teaching
  12. Polarization of Time and Income
  13. Optimisation of root traits to provide enhanced ecosystem services in agricultural systems
  14. How digital reflection and feedback environments contribute to pre-service teachers’ beliefs during a teaching practicum
  15. Käsemann, Ernst
  16. Challenges in political interviews
  17. The theory of human development
  18. How cognitive issue bracketing affects interdependent decision-making in negotiations
  19. Time matters
  20. Integration of material flow management tools in workplace environments
  21. An Ecosystem Architecture Meta-Model for Supporting Ultra-Large Scale Digital Transformations
  22. Exports and productivity: A survey of the evidence from firm-level data
  23. Donor Upgrading Strategies
  24. Das Inverted Classroom Model (ICM) im Kontext kompetenzorientierter Hochschullehre
  25. Teaching Provenance to AI
  26. Effect of ambient conditions in friction surfacing
  27. Article 66 CISG