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394467

Sigma-Aldrich

Morpholine

purified by redistillation, ≥99.5%

Synonym(s):

Tetrahydro-1,4-oxazine

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About This Item

Empirical Formula (Hill Notation):
C4H9NO
CAS Number:
Molecular Weight:
87.12
Beilstein:
102549
EC Number:
MDL number:
UNSPSC Code:
12352100
PubChem Substance ID:
NACRES:
NA.22

vapor density

3 (vs air)

Quality Level

vapor pressure

31 mmHg ( 38 °C)
7 mmHg ( 20 °C)

Assay

≥99.5%

form

liquid

autoignition temp.

590 °F

purified by

redistillation

expl. lim.

10.8 %

refractive index

n20/D 1.454 (lit.)

bp

129 °C (lit.)
129 °C

mp

−7-−5 °C (lit.)

solubility

water: miscible

density

0.996 g/mL at 25 °C (lit.)

SMILES string

C1COCCN1

InChI

1S/C4H9NO/c1-3-6-4-2-5-1/h5H,1-4H2

InChI key

YNAVUWVOSKDBBP-UHFFFAOYSA-N

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General description

Morpholine is a heterocyclic secondary amine. It is formed by the condensation of diethanolamine and sulfuric acid. Its IR spectra and Raman spectra at -180°C has been recorded. The crystal structure of morpholine has been determined at 150K. The microwave spectra of morpholine within the 8 to 40GHz region have been investigated. Ascorbate anion and glutathione have been reported to inhibit the aqueous reaction between nitrogen dioxide and morpholine. Conformational studies by Raman spectroscopy and theoretical calculations suggest that equatorial chair conformation of morpholine predominates in the pure liquid state. Degradation of morpholine using Mycobacterium sp. strain RP1 has been proposed.

Application

Morpholine is suitable for use as a test compound in the study of morpholine biodegradation by Mycobacterium strains.
It may be used in the following studies:
  • As a reactant in the synthesis of 1,3-dihydro-1-hydroxy-3-morpholin-4-yl-2,1-benzoxaborole by reacting with o-formylphenylboronic acid.
  • As a corrosion inhibitor and to maintain basic pH in boiler feed water.
  • As a reactant in the bis(β-ketoenolates)nickel(II) adducts of morpholine.
  • As one of the reagent used in the colorimetric quantitative determination of C-2 unsubstituted phenothiazine derivatives.
  • As a reactant in the quantitative determination of α,β-unsaturated compounds.

Signal Word

Danger

Hazard Classifications

Acute Tox. 3 Dermal - Acute Tox. 3 Inhalation - Acute Tox. 4 Oral - Eye Dam. 1 - Flam. Liq. 3 - Repr. 2 - Skin Corr. 1B

Storage Class Code

3 - Flammable liquids

WGK

WGK 1

Flash Point(F)

87.8 °F - closed cup

Flash Point(C)

31 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Morpholine and its derivatives as vapour phase corrosion inhibitors for mild steel.
Subramanian A, et al.
Bulletin of Electrochemistry, 14(10), 289-290 (1998)
R V Cooney et al.
Cancer letters, 32(1), 83-90 (1986-07-01)
Ascorbate anion and glutathione were found to inhibit the aqueous reaction between nitrogen dioxide (NO2) and morpholine (MOR) and thereby prevented the formation of N-nitrosomorpholine (NMOR) and N-nitromorpholine (NTMOR) at both pH 7.4 and 12.5. These antioxidants are approximately 3
Conformational analysis of morpholine studied using Raman spectroscopy and density functional theoretical calculations.
SenGupta S, et al.
Chemical Physics Letters, 639, 1-6 (2015)
Microwave spectrum of morpholine.
Sloan JJ and Kewley R.
Canadian Journal of Chemistry, 47(18), 3453-3462 (1969)
Adducts of Piperidine, Piperazine, Methylpiperazine, and Morpholine with Bis (β-Ketoenolates) of Nickel (II).
Marcotrigiano G,et al.
Canadian Journal of Chemistry, 50(16), 2557-2560 (1972)

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