M

Morpholine

IUPAC: morpholine

C4H9NO Bases & Alkalis CAS 110-91-8
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Quick Reference
Formula / NotationC4H9NO
CAS Number110-91-8
Molecular Weight87.12
Melting Point23.2 °F (NTP, 1992)
Boiling Point264 °F at 760 mmHg (NTP, 1992)
Density1 at 68 °F (USCG, 1999)
SolubilitySoluble (NTP, 1992)
AppearanceMorpholine appears as a colorless liquid with a fishlike odor. Flash point 100 °F. Corrosive to tissue. Less dense than water and soluble in water. Vapors heavier than air. Used to make other chem...
Also Known As110-91-8; 1-Oxa-4-azacyclohexane; Diethylene oximide; Tetrahydro-1,4-oxazine; Diethylenimide oxide; Diethyleneimide oxide; Diethylene imidoxide; Drewamine; Tetrahydro-2H-1,4-oxazine; Tetrahydro-p-oxazine
CategoryBases & Alkalis

What is Morpholine?

Morpholine is an organic heteromonocyclic compound whose six-membered ring contains four carbon atoms and one nitrogen atom and one oxygen atom that lies opposite to each other; the parent compound of the morpholine family. It is a saturated organic heteromonocyclic parent and a member of morpholines. It is a conjugate base of a morpholinium.

Formula & Notation

C4H9NO

IUPAC Name: morpholine

Other Names / Synonyms: 110-91-8; 1-Oxa-4-azacyclohexane; Diethylene oximide; Tetrahydro-1,4-oxazine; Diethylenimide oxide; Diethyleneimide oxide; Diethylene imidoxide; Drewamine; Tetrahydro-2H-1,4-oxazine; Tetrahydro-p-oxazine

Properties & Characteristics

Appearance: Morpholine appears as a colorless liquid with a fishlike odor. Flash point 100 °F. Corrosive to tissue. Less dense than water and soluble in water. Vapors heavier than air. Used to make other chem.... Molecular formula: C4H9NO. Molecular weight: 87.12 g/mol. Boiling point: 264 °F at 760 mmHg (NTP, 1992). Melting point: 23.2 °F (NTP, 1992). Density: 1 at 68 °F (USCG, 1999). Solubility: Soluble (NTP, 1992). Vapor pressure: 6.6 mmHg at 68 °F (NTP, 1992). LogP: -0.9.

Physical Data

PropertyValue
Melting Point23.2 °F (NTP, 1992)
Boiling Point264 °F at 760 mmHg (NTP, 1992)
Density1 at 68 °F (USCG, 1999)
Molecular Weight87.12
SolubilitySoluble (NTP, 1992)
AppearanceMorpholine appears as a colorless liquid with a fishlike odor. Flash point 100 °F. Corrosive to tissue. Less dense than water and soluble in water. Vapors heavier than air. Used to make other chem...

Uses & Applications

Used in chemical manufacturing, pH adjustment, saponification, water treatment, and as a laboratory reagent.

Safety Information

Corrosive or irritant. Causes burns to skin and eyes. Store away from acids. Wear protective gloves and goggles. Consult SDS before use.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Morpholine
Formula C4H9NO
CAS Number 110-91-8
Molecular Weight 87.12
Category Bases & Alkalis
Synonyms 110-91-8; 1-Oxa-4-azacyclohexane; Diethylene oximide; Tetrahydro-1,4-oxazine; Diethylenimide oxide; Diethyleneimide oxide; Diethylene imidoxide; Drewamine; Tetrahydro-2H-1,4-oxazine; Tetrahydro-p-oxazine

Frequently Asked Questions

Morpholine is an organic heteromonocyclic compound whose six-membered ring contains four carbon atoms and one nitrogen atom and one oxygen atom that lies opposite to each other; the parent compound of the morpholine family. It is a saturated organic heteromonocyclic parent and a member of morpholines. It is a conjugate base of a morpholinium.

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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.