Propylene Glycol

An alcohol, C3H8O2, 76.095 g/mol. Boiling point 187.6 °C, melting point -60 °C, as published.

verified recordOrganic — alcohol9 measured properties

Identifiers

Molecular formula: C₃H₈O₂
Molecular weight: 76.095 g/mol
Exact mass: 76.052429 g/mol
IUPAC name: propane-1,2-diol
SMILES: CC(O)CO
InChI: InChI=1S/C3H8O2/c1-3(5)2-4/h3-5H,2H2,1H3
InChIKey: DNIAPMSPPWPWGF-UHFFFAOYSA-N

Open in ReactionLens Use in reaction prediction

Measured properties

Published measurements, each with its source. Two readings of one property are both shown, in the units each used.

Boiling Point: 370.8 °F at 760 mmHg (NTP, 1992)measured · CAMEO Chemicals; 187.6 °Cmeasured · DrugBank
Melting Point: -76 °F (NTP, 1992)measured · CAMEO Chemicals; -60 °Cmeasured · DrugBank
Density: 1.04 at 68 °F (USCG, 1999) - Denser than water; will sinkmeasured · CAMEO Chemicals; 1.0361 g/cu cm at 20 °Cmeasured · Hazardous Substances Data Bank (HSDB)
Solubility: greater than or equal to 100 mg/mL at 70 °F (NTP, 1992)measured · CAMEO Chemicals; 1000000 mg/L (at 20 °C)measured · DrugBank
Vapor Pressure: 0.08 mmHg at 68 °F ; 0.13 mmHg at 77 °F (NTP, 1992)measured · CAMEO Chemicals; 0.13 [mmHg]measured · Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
LogP: -0.92measured · DrugBank; log Kow = -0.92measured · Hazardous Substances Data Bank (HSDB)
Flash Point: 210 °F (NTP, 1992)measured · CAMEO Chemicals; 99 °Cmeasured · Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Viscosity: 0.581 cP at 20 °Cmeasured · Lewis, R.J. Sr.; Hawley's Condensed Chemical Dictionary 15th Edition. John Wiley & Sons, Inc. New York, NY 2007., p. 1050
Refractive Index: [n]D/20: 1,431-1,433measured · reference compound database; Index of refraction: 1.4324 at 20 °C/Dmeasured · Lide, D.R. CRC Handbook of Chemistry and Physics 88TH Edition 2007-2008. CRC Press, Taylor & Francis, Boca Raton, FL 2007, p. 3-444

Calculated properties

Derived from the structure, not from a sample; kept apart from the measurements above.

Molecular weight: 76.09 g/molcalculated · reference compound database; Average mass of one molecule, from reference compound database.
Exact mass: 76.052429494 Dacalculated · reference compound database; Mass of the most common isotopic form.
XLogP3: -0.9calculated · reference compound database; Estimated oil/water partition, computed by reference compound database.
Polar surface area: 40.5 Å²calculated · reference compound database; Polar surface area as computed by reference compound database.
Complexity: 20calculated · reference compound database; A rough measure of how intricate the structure is.
H-bond donors: 2calculated · reference compound database
H-bond acceptors: 2calculated · reference compound database
logP: -0.6405calculated · chemistry engine; Estimated preference for oil over water. Higher means more oil-like.
Topological polar surface area: 40.46 Å²calculated · chemistry engine; Surface area from polar atoms; relates to how easily a molecule crosses membranes.
H-bond donors: 2calculated · chemistry engine; Atoms that can donate a hydrogen bond.
H-bond acceptors: 2calculated · chemistry engine; Atoms that can accept a hydrogen bond.
Rotatable bonds: 1calculated · chemistry engine; Single bonds the molecule can freely twist around.
Molar refractivity: 18.7666 cm³/molcalculated · chemistry engine; Relates to the molecule's polarisability.
Fraction sp³ carbons: 1calculated · chemistry engine; Share of carbon atoms with tetrahedral bonding.
QED drug-likeness: 0.4358calculated · chemistry engine; Quantitative estimate of drug-likeness (0–1).

What it is made of

Elements

C Carbon3 atoms · 47.4% by mass
O Oxygen2 atoms · 42.1% by mass
H Hydrogen8 atoms · 10.6% by mass

Percentages are of the molecular weight above, worked out the same way the molar mass calculator does it.

Structure

Heavy atoms, hydrogen excluded: 5
Total atoms, hydrogen included: 13
Rings: 0
Aromatic rings: 0
Stereocentres: 1
Formal charge: 0

Functional groups

Alcohol
An –OH group on a saturated carbon.

Matched by structural pattern, not by a measurement.

The molecule in three dimensions

Rotate and inspect the atoms. Loaded only when you ask, so the page stays light.

The drawing above is a diagram of what is bonded to what. A molecule is not flat, and the model here is one low-energy shape generated from the connectivity — useful for seeing which groups can reach each other, and not a measured structure. A real sample is a population of conformations, interconverting.

Reactions it appears in

No documented reaction with a written procedure and a source involves Propylene Glycol yet.

Other names for it

The systematic name on this record is propane-1,2-diol.

The sources also call it 1,2-propanediol, propane-1,2-diol, 1,2-Propylene glycol, 1,2-dihydroxypropane, 2-Hydroxypropanol, Isopropylene glycol, Dowfrost, Sirlene, Methylethyl glycol, Methylethylene glycol, Monopropylene glycol.

Structurally related

Molecules sharing this formula, or whose fingerprint is at least 40% similar to this one. Similarity is Tanimoto on Morgan fingerprints over this library only — it is a measure of structural overlap, not of how alike they behave.

1,3-Propanediol

C3H8O2

(+-)-2-Butanol

C4H10O

1,3-Butanediol

C4H10O2

(R)-(-)-2-Amino-1-propanol

C3H9NO

(2R)-1-aminopropan-2-ol

C3H9NO

Seen alongside it in reaction records

Molecules that appear in the same recorded reactions as Propylene Glycol. This says nothing about structure: most of them are the bases, solvents, ligands and catalysts the chemistry needed, and they are here because somebody put them in the same flask.

1,1'-(Chlorophenylmethylene)bis(4-methoxybenzene)

used as a reactant

C₂₁H₁₉ClO₂, 338.834 g/mol.

1,3-Dioxolane, 2,4-dimethyl-2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthalenyl)-

formed as a product

C₁₉H₂₈O₂, 288.431 g/mol.

Where these values came from

reference compound database1030
compound record
chemistry engine
structure perception

compound record.

What this page does not claim

Identifiers are copied from the source record, measured values are reported as published, and calculated values are marked as calculated. Nothing here is a hazard, purity or handling assessment — how the library is checked.