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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Published on: September 5, 2014

The Formose Reaction with SO₂: A Computational Study.

Emily M Sisson¹, Jeremy Kua¹

¹Department of Chemistry & Biochemistry, University of San Diego, San Diego, CA 92110, USA.

Life (Basel, Switzerland)

|March 28, 2026

Summary

This summary is machine-generated.

Sulfur dioxide (SO2) and sulfurous acid (H2SO3) can catalyze the formose reaction, promoting sugar formation by enhancing key steps and suppressing side reactions. These compounds act as prebiotic analogs, aiding in the synthesis of essential biomolecules.

Keywords:

formose reaction origins of life prebiotic chemistry proto-metabolism sulfur

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Published on: February 1, 2020

Area of Science:

Biochemistry
Astrochemistry
Organic Chemistry

Background:

The formose reaction is a key process in prebiotic chemistry, synthesizing sugars from formaldehyde.
Understanding the factors that control the formose reaction's efficiency and selectivity is crucial for origin-of-life studies.
Autocatalytic cycles are central to the formose reaction's progression.

Purpose of the Study:

To investigate the influence of sulfur dioxide (SO2) and sulfurous acid (H2SO3) on the formose reaction's core autocatalytic cycle.
To explore the potential of SO2 and H2SO3 as prebiotic catalysts for sugar synthesis.

Main Methods:

Computational modeling of reaction thermodynamics and kinetics.
Analysis of the interaction between SO2/H2SO3 and formose intermediates.
Thermodynamic and kinetic evaluation of aldol additions, retroaldol steps, and Cannizzaro side-reactions.

Main Results:

SO2 and H2SO3 condense with aldehyde and alcohol groups, forming bisulfite analogs of formose intermediates.
The bisulfite group enhances intramolecular catalysis for aldol additions and retroaldol reactions.
Bisulfite moiety thermodynamically and kinetically disfavors the Cannizzaro side-reaction, increasing sugar yield.
Bisulfite provides modest thermodynamic stabilization of ribose over other C5 aldose diastereomers, acting as a phosphate analog.

Conclusions:

SO2 and H2SO3 can significantly influence the formose reaction, promoting sugar formation.
Bisulfite functional groups offer catalytic advantages and suppress parasitic reactions in prebiotic sugar synthesis.
These findings highlight the potential role of sulfur compounds in early Earth chemistry and the origin of life.