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Updated: May 30, 2026

Synthesis of Esters Via a Greener Steglich Esterification in Acetonitrile
Published on: October 30, 2018
Electron transfer reduction of unactivated esters using SmI2-H2O
Michal Szostak1, Malcolm Spain, David J Procter
1School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom.
Samarium diiodide effectively reduces unactivated esters, including primary, secondary, and tertiary alkyl types. This new method offers excellent yields, rivaling traditional metal hydride and alkali metal reductions.
Area of Science:
- Organic Chemistry
- Organometallic Chemistry
Background:
- Ester reduction is a fundamental transformation in organic synthesis.
- Samarium diiodide is a versatile reducing agent, but its application to unactivated esters was previously unexplored.
Purpose of the Study:
- To report the first successful reduction of unactivated esters using samarium diiodide.
- To develop an optimized protocol for this novel transformation.
Main Methods:
- Reaction of various primary, secondary, and tertiary alkyl esters with samarium diiodide under optimized conditions.
- Characterization of the reduction products.
Main Results:
- The optimized protocol achieved excellent yields for the reduction of primary, secondary, and tertiary alkyl esters.
- The efficiency of samarium diiodide reduction is comparable to established methods like metal hydrides and alkali metals.
Conclusions:
- Samarium diiodide provides a new, efficient route for the reduction of unactivated esters.
- This method presents a competitive alternative to existing ester reduction techniques in organic synthesis.
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