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C–C Bond Formation: Aldol Condensation Overview

C–C Bond Formation: Aldol Condensation Overview

Aldol condensation is an important route in synthetic organic chemistry used to generate a new carbon–carbon bond under basic or acidic conditions. The aldol condensation reaction presented in Figure 1 constitutes an aldol addition reaction followed by the dehydration process.

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

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Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.

Alcohols from Carbonyl Compounds: Reduction

Alcohols from Carbonyl Compounds: Reduction

Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...

Preparation of Aldehydes and Ketones from Carboxylic Acid Derivatives

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Aldehydes are more reactive than carboxylic acids and hence, can get over-reduced to alcohol in the presence of strong reducing agents. Therefore, carboxylic acids are inefficient in preparing aldehydes using LAH.
Carboxylic acid derivatives like acid chlorides and esters are more easily reducible than the corresponding acids. The derivatives reduce in the presence of mild reducing agents to give aldehydes. Aldehydes can also be prepared by Rosenmund reduction, that is, the reduction of...

Ketones with Nonenolizable Aromatic Aldehydes: Claisen–Schmidt Condensation

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Benzaldehyde, like formaldehyde, lacks an α hydrogen and cannot enolize to form an enolate. Hence, the reaction of benzaldehyde with a ketone in the presence of an aqueous base forms a single crossed product. This reaction is referred to as Claisen–Schmidt condensation.
As the self-condensation of ketones is generally not favored in basic conditions, the self-condensed products do not form in the reaction between ketones and benzaldehyde. The general reaction of Claisen–Schmidt...

Protecting Groups for Aldehydes and Ketones: Introduction

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Protecting groups are compounds that can bind to a specific functional group in the presence of other functional groups to protect them from undesired chemical reactions. These compounds can selectively bind to particular functional groups and advance chemoselective reactions in polyfunctional systems (Figure 1). After the functional group has served its purpose, it is removed by reacting it with specific compounds.

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

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Selective Reductive Coupling of Formaldehyde into Carbohydrate Precursors.

Hui Cao^1,2, Zongxi Zhang^1,2, Jiancheng Zhao^1,2

¹Institute of Coal Chemistry, Chinese Academy of Sciences, 27 South Taoyuan Road, Taiyuan 030001, China.

Journal of Agricultural and Food Chemistry

|June 26, 2025

Summary

This summary is machine-generated.

This study introduces a novel base-free method using ionic liquids to convert formaldehyde into valuable carbohydrate precursors like glycolaldehyde. This efficient process offers a new route for synthesizing C3-C4 products from C1 building blocks.

Keywords:

NMR carbohydrate precursors formaldehyde hydrogen bonds imidazolium-based ionic liquids

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Published on: October 24, 2016

Area of Science:

Organic Chemistry
Catalysis
Green Chemistry

Background:

Synthesizing multicarbon products from formaldehyde is crucial for carbohydrate precursor production.
Developing selective and efficient formaldehyde conversion methods remains a significant challenge.

Purpose of the Study:

To investigate the use of imidazolium-based ionic liquids (ILs) with N-heterocyclic carbenes (NHCs) for base-free formaldehyde coupling.
To achieve selective conversion of formaldehyde into glycolaldehyde precursor (GP) and dihydroxyacetone precursor.

Main Methods:

A one-pot, two-step reaction process utilizing [BHMIm][OAc] as a key intermediate.
Optimization of reaction conditions to maximize product yield.
Characterization using 1H-1H NOESY NMR, DFT calculations, NMR, and mass spectrometry.

Main Results:

Achieved highly selective conversion of formaldehyde into GP and dihydroxyacetone precursor.
Maximum total yield of carbohydrate precursors reached 67.2% under optimized conditions.
Identified hydrogen bonding between the acetate anion and intermediates as critical for activation and conversion.

Conclusions:

A novel, appealing route for stepwise construction of C3-C4 products from C1 building blocks (formaldehyde) was established.
The use of ILs-NHC offers an environmentally friendly and efficient approach to formaldehyde conversion.
Understanding the reaction mechanism through computational and spectroscopic analyses provides a foundation for further development.