Taming Sulfate Radical for Anti-Markovnikov Alkene Hydrosulfation

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Radical Chemistry

Background:

• Sulfate radicals (SO₄^•-) are potent oxidants underutilized in alkene functionalization.
• Their high redox potential typically favors electron transfer over addition reactions.
• Organosulfates are valuable compounds found in biomolecules, pharmaceuticals, and detergents.

Purpose of the Study:

• To develop a strategy for harnessing sulfate radicals for anti-Markovnikov hydrosulfation of alkenes.
• To control the reactivity of sulfate radicals for selective synthesis.
• To enable the synthesis of diverse organosulfates and related compounds.

Main Methods:

• Utilizing a synergistic "redox-recognition" and polar effects strategy.
• Employing a hydrogen donor with a tailored redox potential to control sulfate radical generation.
• Controlling reductive liberation of sulfate radicals from persulfates.

Main Results:

• Successful anti-Markovnikov hydrosulfation of alkenes using sulfate radicals.
• Synthesis of structurally diverse organosulfates and anti-Markovnikov hydration products.
• Demonstrated switchable pathways for selective alkene hydrosulfation or alcohol O-sulfurylation.

Conclusions:

• The developed protocol provides a powerful tool for synthesizing valuable organosulfates.
• Precise modulation of sulfate radical reactivity allows for control over reaction pathways.
• This method expands the utility of sulfate radicals in organic synthesis.