N,N-Diethylethylenediamine: Properties, Uses & Lab Guide

N,N-Diethylethylenediamine is a bifunctional aliphatic diamine featuring both a tertiary and a primary amine group, making it a versatile building block in organic synthesis, ligand design, and pharmaceutical research.

Molecular Formula

C6H16N2

Molecular Weight

116.21 g/mol

CAS Number

100-36-7

Appearance

Colorless to pale yellow liquid

Primary Functional Groups

Primary amine (-NH2) and tertiary amine (-N(C2H5)2)

Solubility

Miscible with water and common organic solvents

Chemical Identity and Physical Properties

N,N-Diethylethylenediamine (CAS 100-36-7), also known as N,N-diethyl-1,2-ethanediamine or diethylaminoethylamine, is an aliphatic diamine with the molecular formula C₆H₁₆N₂ and a molecular weight of approximately 116.21 g/mol. The compound contains two distinct nitrogen centers: a primary amine at one terminus of the ethylene bridge and a tertiary amine bearing two ethyl substituents at the other. This asymmetry is the key to its chemical utility, allowing selective reactions at the more nucleophilic primary amine while the tertiary amine can serve as an internal base or coordination site.

The compound is typically encountered as a colorless to pale yellow liquid with a characteristic amine odor. It is miscible with water and most polar organic solvents, including ethanol, methanol, and dichloromethane. Its relatively low molecular weight and dual amine functionality make it highly reactive toward electrophiles such as acyl chlorides, isocyanates, aldehydes, and activated esters.

Applications in Organic Synthesis and Drug Discovery

N,N-Diethylethylenediamine serves as a versatile building block across several domains of synthetic chemistry. In medicinal chemistry, the compound is widely used to introduce a basic, lipophilic diamine side chain into drug candidates, a motif commonly associated with improved membrane permeability and modulation of pharmacokinetic properties. The tertiary amine nitrogen can be protonated under physiological pH to enhance aqueous solubility, while the ethyl groups impart lipophilicity.

In coordination chemistry and materials science, the bifunctional nature of the molecule allows it to act as a bidentate or bridging ligand for transition metals. It can coordinate through both nitrogen atoms to form stable five-membered chelate rings with metal ions such as copper, nickel, and palladium, making it valuable in catalysis research.

Additionally, the primary amine group reacts readily with carbonyl compounds to form imines or with activated esters and acid chlorides to yield amides. These transformations are exploited in the synthesis of ureas, thioureas, sulfonamides, and heterocyclic scaffolds, positioning N,N-diethylethylenediamine as an efficient linker or spacer in combinatorial and parallel synthesis workflows.

Safe Handling, Storage, and Regulatory Considerations

As a low-molecular-weight aliphatic amine, N,N-Diethylethylenediamine is corrosive and can cause irritation or burns to skin, eyes, and the respiratory tract upon contact or inhalation of vapors. Laboratory personnel should wear appropriate personal protective equipment (PPE), including chemical-resistant gloves, safety goggles, and lab coats. Work should be performed in a well-ventilated fume hood to minimize inhalation exposure.

The compound should be stored in a tightly sealed container in a cool, dry, and well-ventilated location, away from strong acids, oxidizing agents, and sources of ignition. Proper labeling and secondary containment are recommended to prevent accidental spills. Disposal should follow local regulations for amine-containing chemical waste.

Researchers should consult the Safety Data Sheet (SDS) provided by Aladdin Scientific for the specific product (SKU D742419) before use. All transport and shipping of this reagent must comply with applicable local and international regulations for hazardous chemicals.

Quality, Purity, and Analytical Characterization

For research applications, the purity of N,N-Diethylethylenediamine is a critical parameter that directly affects reaction yields and reproducibility. Aladdin Scientific supplies this compound (SKU D742419) at research-grade purity. Common analytical techniques used to verify the identity and purity of the compound include gas chromatography (GC), nuclear magnetic resonance spectroscopy (NMR — particularly ¹H and ¹³C), and mass spectrometry (MS).

Key spectral markers include characteristic NMR signals for the ethylene bridge protons (–CH₂CH₂–), the N-ethyl methylene and methyl protons, and the primary amine protons. The absence of significant impurity peaks in the GC trace and correct molecular ion in mass spectrometry confirm compound identity.

Procurement teams and lab managers should request a Certificate of Analysis (CoA) when ordering to confirm that lot-specific purity meets the requirements of their experimental protocols.

Frequently asked questions

What is the difference between the primary and tertiary amine in N,N-Diethylethylenediamine, and how does this affect reactivity?

N,N-Diethylethylenediamine contains one primary amine (–NH2) and one tertiary amine (–N(C2H5)2). The primary amine is significantly more nucleophilic and can readily react with electrophiles such as acyl chlorides, isocyanates, and aldehydes, while the tertiary amine lacks an N–H bond and therefore cannot form amides or imines but can act as an internal base or metal coordination site. This functional asymmetry enables selective transformations at the primary amine end.

How should N,N-Diethylethylenediamine be stored to ensure long-term stability?

The compound should be stored in a tightly sealed container under cool, dry, and well-ventilated conditions, away from strong acids, oxidizing agents, and ignition sources. Exposure to air and moisture should be minimized to prevent gradual oxidation or absorption of carbon dioxide, which can form carbonate salts with primary amines. Refrigerated storage is advisable for extended shelf life.

Can N,N-Diethylethylenediamine be used as a ligand in metal-catalyzed reactions?

Yes. The two nitrogen atoms in N,N-Diethylethylenediamine can coordinate to transition metals, forming stable five-membered chelate rings. This bidentate coordination makes the compound useful as a supporting ligand in reactions involving metals such as copper, palladium, and nickel. Researchers should optimize ligand-to-metal ratios and reaction conditions for their specific catalytic application.

What personal protective equipment is recommended when handling N,N-Diethylethylenediamine?

Due to its corrosive and irritating nature, users should wear chemical-resistant gloves (such as nitrile or neoprene), safety goggles or a face shield, and a laboratory coat. All manipulations should be conducted in a well-ventilated fume hood. Refer to the product SDS from Aladdin Scientific (SKU D742419) for complete hazard and first-aid information.

References

1. March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure. Wiley-Interscience. General reference for amine reactivity and synthetic transformations.
2. Aladdin Scientific. Product Page: N,N-Diethylethylenediamine, SKU D742419. Aladdin-e.com.
3. NIST WebBook. N,N-Diethylethylenediamine (CAS 100-36-7). National Institute of Standards and Technology.

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