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Light-driven Enzymatic Decarboxylation

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Harnessing a Continuous-Flow Persulfuric Acid Generator for Direct Oxidative Aldehyde Esterifications.

Bence S Nagy¹, Gang Fu¹, Christopher A Hone^1,2

¹Institute of Chemistry, University of Graz, NAWI Graz, Heinrichstrasse 28, A-8010, Graz, Austria.

|November 15, 2022

Summary

A new continuous flow generator safely produces persulfuric acid for oxidative esterification of aldehydes. This method enhances safety and scalability for organic synthesis, overcoming limitations of traditional batch processing.

Keywords:

aldehydes chemical generators continuous flow esters persulfuric acid

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Area of Science:

Organic Chemistry
Chemical Engineering
Process Safety

Background:

Persulfuric acid is a potent oxidant but its explosive decomposition limits its use in organic synthesis.
Traditional batch methods pose significant safety risks when handling persulfuric acid.

Purpose of the Study:

To develop a continuous in situ persulfuric acid generator for safe and efficient organic synthesis.
To apply the generated persulfuric acid for the oxidative esterification of aldehydes under flow conditions.

Main Methods:

Development of a continuous-flow generator for in situ persulfuric acid production using sulfuric acid as a precursor.
Application of the flow system for the oxidative esterification of various aliphatic and aromatic aldehydes.

Main Results:

The continuous-flow generator significantly reduced safety hazards associated with persulfuric acid.
The method enabled robust and effective direct transformation of aldehydes to valuable esters.
Successful multigram-scale synthesis of a pharmaceutically relevant intermediate was achieved.

Conclusions:

The developed flow protocol offers a safe, sustainable, and scalable method for utilizing persulfuric acid in organic synthesis.
This approach overcomes the limitations of conventional batch processing for reactions involving persulfuric acid.