Octanoic Acid

A carboxylic acid, C8H16O2, 144.214 g/mol. Boiling point 239 °C, melting point 16.3 °C, as published.

verified recordOrganic — carboxylic acid9 measured properties

Identifiers

Molecular formula: C₈H₁₆O₂
Molecular weight: 144.214 g/mol
Exact mass: 144.11503 g/mol
IUPAC name: octanoic acid
SMILES: CCCCCCCC(=O)O
InChI: InChI=1S/C8H16O2/c1-2-3-4-5-6-7-8(9)10/h2-7H2,1H3,(H,9,10)
InChIKey: WWZKQHOCKIZLMA-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: 463.5 °F at 760 mmHg (NTP, 1992)measured · CAMEO Chemicals; 239 °Cmeasured · DrugBank
Melting Point: 61 to 62 °F (NTP, 1992)measured · CAMEO Chemicals; 16.3 °Cmeasured · DrugBank
Density: 0.91 (USCG, 1999) - Less dense than water; will floatmeasured · CAMEO Chemicals; 0.910 at 20 °C/4 °Cmeasured · Hazardous Substances Data Bank (HSDB)
Solubility: less than 1 mg/mL at 64 °F (NTP, 1992)measured · CAMEO Chemicals; 789 mg/L (at 30 °C)measured · DrugBank
Vapor Pressure: 1 mmHg at 198.1 °F ; 5 mmHg at 237.4 °F; 760 mmHg at 459.5 °F (NTP, 1992)measured · CAMEO Chemicals; 0.00371 [mmHg]measured · Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
LogP: 3.05measured · DrugBank; log Kow = 3.05measured · Hazardous Substances Data Bank (HSDB)
Flash Point: 230 °F (NTP, 1992)measured · CAMEO Chemicals; 270 °Fmeasured · Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Viscosity: 5.74 mPa.secmeasured · Kirk-Othmer Encyclopedia of Chemical Technology. 4th ed. Volumes 1: New York, NY. John Wiley and Sons, 1991-Present., p. V5: 149 (1993)
Refractive Index: Index of refraction: 1.4285 at 20 °C/Dmeasured · Lide, D.R. CRC Handbook of Chemistry and Physics 86TH Edition 2005-2006. CRC Press, Taylor & Francis, Boca Raton, FL 2005, p. 3-404; 1.423-1.429measured · reference compound database

Calculated properties

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

Molecular weight: 144.21 g/molcalculated · reference compound database; Average mass of one molecule, from reference compound database.
Exact mass: 144.115029749 Dacalculated · reference compound database; Mass of the most common isotopic form.
XLogP3: 3calculated · reference compound database; Estimated oil/water partition, computed by reference compound database.
Polar surface area: 37.3 Å²calculated · reference compound database; Polar surface area as computed by reference compound database.
Complexity: 89calculated · reference compound database; A rough measure of how intricate the structure is.
H-bond donors: 1calculated · reference compound database
H-bond acceptors: 2calculated · reference compound database
logP: 2.4315calculated · chemistry engine; Estimated preference for oil over water. Higher means more oil-like.
Topological polar surface area: 37.3 Å²calculated · chemistry engine; Surface area from polar atoms; relates to how easily a molecule crosses membranes.
H-bond donors: 1calculated · chemistry engine; Atoms that can donate a hydrogen bond.
H-bond acceptors: 1calculated · chemistry engine; Atoms that can accept a hydrogen bond.
Rotatable bonds: 6calculated · chemistry engine; Single bonds the molecule can freely twist around.
Molar refractivity: 41.0118 cm³/molcalculated · chemistry engine; Relates to the molecule's polarisability.
Fraction sp³ carbons: 0.875calculated · chemistry engine; Share of carbon atoms with tetrahedral bonding.
QED drug-likeness: 0.5812calculated · chemistry engine; Quantitative estimate of drug-likeness (0–1).

What it is made of

Elements

C Carbon8 atoms · 66.6% by mass
O Oxygen2 atoms · 22.2% by mass
H Hydrogen16 atoms · 11.2% 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: 10
Total atoms, hydrogen included: 26
Rings: 0
Aromatic rings: 0
Stereocentres: 0
Formal charge: 0

Functional groups

Carboxylic acid
A carbon double-bonded to oxygen and bonded to an –OH group; acidic.

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 Octanoic Acid yet.

Other names for it

The systematic name on this record is octanoic acid.

The sources also call it caprylic acid, n-octanoic acid, n-caprylic acid, Octylic acid, octoic acid, n-octylic acid, 1-heptanecarboxylic acid, n-Octoic acid, Enantic acid, Octic acid, C-8 acid.

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, 2-(4-pentenyl)-

C8H16O2

Seen alongside it in reaction records

Molecules that appear in the same recorded reactions as Octanoic Acid. 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.

1,5-Diacetyl-2-indolinone

used as a reactant

C₁₂H₁₁NO₃, 217.224 g/mol.

Where these values came from

reference compound database379
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.