Hydroselenation of olefins: elucidating the β-selenium effect
Gabriel S Phun1, Hannah S Slocumb1, Kirsten J Ruud1
1Department of Chemistry, University of California Irvine California 92697 USA filipp.furche@uci.edu dongv@uci.edu.
Blue light triggers alkene hydroselenation, yielding linear selenides with high anti-Markovnikov selectivity. A novel beta-selenium effect guides this radical addition process.
Area of Science:
- Organic Chemistry
- Photochemistry
- Radical Reactions
Background:
- Hydroselenation of alkenes is a crucial synthetic transformation.
- Achieving high regioselectivity, particularly anti-Markovnikov addition, remains a challenge.
- Radical-mediated pathways offer alternative routes to functionalized organic molecules.
Purpose of the Study:
- To develop a light-promoted method for alkene hydroselenation.
- To achieve high anti-Markovnikov selectivity in the formation of beta-seleno carbon radicals.
- To elucidate the mechanism and the role of the beta-selenium effect in directing selectivity.
Main Methods:
- Photocatalysis using blue light.
- Reaction of alkenes with aryl diselenides.
- Radical trapping and mechanistic studies.
Main Results:
- Successful light-promoted hydroselenation of alkenes was achieved.
- High anti-Markovnikov selectivity was observed, favoring linear selenide products.
- A unique beta-selenium effect was identified, stabilizing the radical intermediate and directing selectivity.
Conclusions:
- Blue light activation of aryl diselenides provides an efficient route to hydroselenation.
- The observed anti-Markovnikov selectivity is attributed to a beta-selenium effect.
- This work offers a novel strategy for synthesizing linear selenides with high selectivity.
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