Diethyl Malonate
Diethyl Malonate - Related Videos
01:14
Alkylation of β-Diester Enolates: Malonic Ester Synthesis
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2023
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides. The reaction proceeds via abstraction of the acidic α hydrogen from a ꞵ-diester to produce a doubly stabilized enolate ion. The nucleophilic enolate attacks the alkyl halide in an SN2 manner to form an alkylated malonic ester intermediate with a new C–C bond. Further treating the intermediate with aqueous acid or base results in the hydrolysis of the two...
01:35
Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives
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2025
Just like β-keto acids—which upon thermal decarboxylation form ketones—β-dicarboxylic acids undergo decarboxylation to generate monocarboxylic acids with the liberation of carbon dioxide. The mechanism initiates with an internal electronic redistribution, resulting in a cyclic six-membered transition state. This is followed by a C–C bond cleavage to produce an enol by releasing carbon dioxide gas. Next, the enol rapidly tautomerizes under the acidic conditions to yield a more stable...
09:45
Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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2017
Reliable, intermediate scale preparation of 1,2,3,4,5-pentamethylcyclopentadiene (Cp*H) is presented. The revised protocol for the synthesis and purification of the ligand minimizes the need for specialized laboratory equipment while simplifying reaction workups and product purification. Use of Cp*H in the synthesis of [Cp*MCl2]2 complexes (M = Ru, Ir) is also described.
07:44
Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
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Cited by 5 •
2016
Photostable cyanine dyes are attached to oligonucleotides to monitor hybridization by energy transfer.
07:46
On-site DNA Detection of Trypanosomatid Parasites and Nosema ceranae Through Alkaline Lysis Coupled to RPA/CRISPR/Cas12a System
0 Views •
2025
Here, we describe a simple and quick procedure for detecting DNA from bee pathogens, such as Lotmaria passim and Nosema ceranae, using an amplification-ready cell lysis, recombinase polymerase amplification, and CRISPR/Cas12a assays.
FAQs
The methylene group between the two ester groups contains relatively acidic hydrogens. A strong base can remove one of these hydrogens, producing an enolate whose negative charge is stabilized by resonance involving the neighboring ester groups. This stabilization makes the enolate sufficiently reactive toward suitable electrophiles, enabling carbon-carbon bond formation during synthesis.
The two ester groups flank the methylene group and influence its acidity and subsequent reactivity. Their arrangement allows base treatment to generate a resonance-stabilized enolate rather than an unstabilized carbon-centered species. As a result, the molecule can serve as a controlled platform for introducing substituents before later conversion into a functionalized acid.
The enolate acts as the carbon-based reactive intermediate formed after strong-base treatment. It reacts with a suitable electrophile to create a new carbon-carbon bond, thereby attaching an additional group to the malonate framework. This step is central to building substituted structures that can later undergo hydrolysis and decarboxylation.
After alkylation, the ester groups undergo hydrolysis, followed by decarboxylation. This sequence removes the malonate-derived ester functionality and produces a substituted acetic acid. The order of operations is important because alkylation first establishes the carbon skeleton, while hydrolysis and decarboxylation transform that skeleton into the targeted acid product.
A typical sequence begins with strong-base treatment to form the enolate, followed by reaction with a suitable electrophile. The resulting alkylated material is then subjected to hydrolysis and decarboxylation. Together, these stages provide a route from the malonate starting material to a substituted acetic acid with a newly formed carbon-carbon bond.
Its value comes from combining a reactive central methylene group with ester functionality that supports later structural conversion. This makes it useful for constructing carbon-carbon bonds and preparing functionalized molecules. The resulting chemistry has applications in preparing pharmaceuticals, agrochemicals, dyes, and other valuable organic intermediates.