What is n-Undecane CAS 1120-21-4?

n-Undecane, also called undecane or hendecane, is a linear saturated C11 alkane with the molecular formula C11H24 and molecular weight 156.31 g/mol. It is a colorless clear liquid with a mild hydrocarbon odor, EC number 214-300-6, and is supplied for analytical, laboratory, and industrial use.

What are the main uses of n-Undecane?

It is commonly used as a reference hydrocarbon and internal standard in gas chromatography, a nonpolar specialty solvent in organic synthesis, and a model compound in combustion or fuel research. It can also serve as a carrier fluid, diluent, or intermediate in controlled hydrocarbon formulations.

Why is n-Undecane used as a GC reference standard?

Because its boiling point and retention time are well defined, n-Undecane is useful for retention-time comparison, Kovats index calibration, and hydrocarbon fingerprinting. Its known Kovats retention index around 1100 makes it a convenient marker for alkane analysis.

What is the difference between n-Undecane and branched undecane isomers?

n-Undecane is the straight-chain C11 alkane with a defined boiling point around 195-196 degC and density about 0.74 g/cm3. Branched undecane isomers have different molecular geometry, boiling points, density, combustion behavior, and chromatographic retention, so they are not interchangeable with pure linear n-undecane.

n-Undecane CAS 1120-21-4

n-Undecane, also called undecane or hendecane, CAS 1120-21-4, is a straight-chain C11 alkane supplied as a colorless clear liquid and positioned as a specialty solvent and reference compound rather than a bulk fuel component. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 1120-21-4
Synonyms: Undecane; n-Undecane
Einecs: 214-300-6
Molecular Formula: C11H24
Grade: Industrial / analytical grade
Package: Standard liquid chemical packaging

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Product Description

n-Undecane CAS 1120-21-4 is a linear saturated C11 alkane with EC 214-300-6 and molecular formula C11H24.

Synonyms: Undecane; n-Undecane.

CAS: 1120-21-4.

Molecular formula: C11H24.

It is supplied as a colorless clear liquid with a mild hydrocarbon odor.

It has a molecular weight of about 156.31 g/mol.

It is positioned as a specialty solvent and reference compound for defined hydrocarbon structure and controlled volatility.

It is used as a reference hydrocarbon and internal standard in gas chromatography.

It is used as a nonpolar specialty solvent in organic synthesis and as a model compound in combustion or fuel research.

It can serve as a carrier fluid, diluent, or intermediate in controlled hydrocarbon formulations.

Its well-defined boiling point and retention time make it useful for retention-time comparison and Kovats index calibration around 1100.

Confirm the required industrial or analytical grade, assay, appearance, and related specifications for the chosen grade.

Check compatibility with the target solvent system, formulation, or analytical method.

Store in a cool, well-ventilated area, away from ignition sources and direct sunlight.

Keep containers tightly closed when not in use to reduce evaporation, odor release, and contamination.

Confirm packaging suitable for the liquid form and order quantity, and follow the current SDS.

Confirm grade, packaging, and specification as required.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is n-Undecane CAS 1120-21-4?

A: n-Undecane, also called undecane or hendecane, is a linear saturated C11 alkane with the molecular formula C11H24 and molecular weight 156.31 g/mol. It is a colorless clear liquid with a mild hydrocarbon odor, EC number 214-300-6, and is supplied for analytical, laboratory, and industrial use.
Q:
What are the main uses of n-Undecane?

A: It is commonly used as a reference hydrocarbon and internal standard in gas chromatography, a nonpolar specialty solvent in organic synthesis, and a model compound in combustion or fuel research. It can also serve as a carrier fluid, diluent, or intermediate in controlled hydrocarbon formulations.
Q:
Why is n-Undecane used as a GC reference standard?

A: Because its boiling point and retention time are well defined, n-Undecane is useful for retention-time comparison, Kovats index calibration, and hydrocarbon fingerprinting. Its known Kovats retention index around 1100 makes it a convenient marker for alkane analysis.
Q:
What is the difference between n-Undecane and branched undecane isomers?

A: n-Undecane is the straight-chain C11 alkane with a defined boiling point around 195-196 degC and density about 0.74 g/cm3. Branched undecane isomers have different molecular geometry, boiling points, density, combustion behavior, and chromatographic retention, so they are not interchangeable with pure linear n-undecane.
Q:
How should n-Undecane be handled and stored?

A: Handle it as a flammable hydrocarbon liquid and store it in a cool, well-ventilated area away from ignition sources and direct sunlight. Keep containers tightly closed when not in use to reduce evaporation, odor release, and contamination.

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