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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 4145413Generated: November 4, 2026

4-Morpholinopyridine

4-(pyridin-4-yl)Morpholine · SKL333 · 4-Morpholinopyridine · 4-(4-PYRIDYL)MORPHOLINE · 4-MORPHOLINOPYRIDINE 97% · 4-(4-Pyridinyl)Morpholine · 4-(4-Pyridyl)morpholine>Morpholine, 4-(4-pyridinyl)- · 4-(4-Morpholinyl)pyridine, 97%

https://huagongshe.com/en/chemical/4145413

4-Morpholinopyridine molecular structure

Identifiers & Physical Properties

CAS No.2767-91-1
Molecular formulaC9H12N2O
Average molar mass164.2 g/mol
Monoisotopic mass164.09496301 g/mol
SMILESc1cc(N2CCOCC2)ccn1
InChIKeyQJWQYVJVCXMTJP-UHFFFAOYSA-N
PubChem CID4145413
ChEMBLCHEMBL1643354
EC No.627-998-6
DTXSIDDTXSID20399887

Chemical & Physical Properties

XLogP0.6
Topological polar surface area25.4
Hydrogen bond donors0
Hydrogen bond acceptors3
Rotatable bonds1
Heavy atoms12
Formal charge0
Complexity128
Melting point102-108 °C (lit.)
Boiling point301.3±32.0 °C(Predicted)
Density1.124±0.06 g/cm3(Predicted)
Storage conditionsSealed in dry,Room Temperature
Solubilitysoluble in Methanol
pKa (acidity coefficient)7.97±0.26(Predicted)
Physical statePowder
ColorYellow to orange
InChIInChI=1S/C9H12N2O/c1-3-10-4-2-9(1)11-5-7-12-8-6-11/h1-4H,5-8H2
InChIKeyQJWQYVJVCXMTJP-UHFFFAOYSA-N
SMILESN1(C2C=CN=CC=2)CCOCC1
UNSPSC Code12352100
NACRESNA.22
GHS pictogramGHS07
Signal wordWarning
GHS hazard statementsH315-H319-H335
GHS precautionary statementsP261-P264-P271-P280-P302+P352-P305+P351+P338
Target organsRespiratory system
Personal protective equipment (PPE)dust mask type N95 (US), Eyeshields, Gloves
Hazard symbolsXi
Risk statements (R)36/37/38
Safety statements (S)26-36
Water hazard class (WGK)3
Customs code2934999090
Storage class11 - Combustible Solids
Hazard classEye Irrit. 2Skin Irrit. 2STOT SE 3

Safety & Regulations

GHS classificationWarningH315 (100%): Causes skin irritation [Warning Skin corrosion/irritation]P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 40 reports by companies from 3 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard Classes and CategoriesSkin Irrit. 2 (100%)
Personal protective equipment (PPE)dust mask type N95 (US), Eyeshields, Gloves
Water hazard class (WGK)3
Customs code2934999090
Risk statements (R)36/37/38
Signal wordWarning
GHS pictogramGHS07
Hazard symbolsXi
Safety statements (S)26-36
Storage class11 - Combustible Solids
Target organsRespiratory system
GHS hazard statementsH315-H319-H335
Hazard classEye Irrit. 2Skin Irrit. 2STOT SE 3
GHS precautionary statementsP261-P264-P271-P280-P302+P352-P305+P351+P338

Applications & Uses

Uses

4-Morpholinopyridine may be used in the synthesis of 1-alkyl-4-morpholinopyridinium halides. It may also be used as a secondary enhancer to improve the chemiluminescence of horseradish peroxidase (HRP) catalyzed oxidation of luminol.

General Description

4-Morpholinopyridine (MORP) can be synthesized by the reduction of its 1-oxide. It undergoes morpholine ring contraction on reacting with trimethylsilylmethyllithium (TMSCH2Li).