A summary of the most common chemical descriptors (InChI Key and SMILES codes) for Furan are summarized together with 3D and 2D structures and relevant physico-chemical properties.

What is the Furan?

The molecule Furan presents a molecular formula of C4H4O and its IUPAC name is furan.

A furan is a heterocyclic aromatic organic compound consisting of a five-membered ring of four carbon atoms and one oxygen atom. The word "furan" comes from from the Latin furfur, meaning bran. Furans are found in many organic compounds, but they are relatively rare in nature. One of the most notable furans is the heterocyclic aromatic compound furan itself, which is an important starting material for many industrial processes..

Furan is an important starting material for the production of a number of industrially important chemicals. For example, it is used in the production of maleic anhydride, a key ingredient in the production of polyester resins. Furan is also used in the production of fumaric acid, which is used in the food and pharmaceutical industries..

In addition to its use as a starting material for the production of other chemicals, furan is also used as a food additive. It is added to food as a preservative and as a flavor enhancer. Furan is also used in the production of some plastics..

Furan is a colorless, flammable liquid with a sweet, fruity odor. It is soluble in water and insoluble in most organic solvents. Furan is produced commercially by the catalytic dehydrogenation of furfural, which comes from from corn cobs..

Furan is a carcinogen and is considered a health hazard. Exposure to furan can cause liver damage and cancer..

3D structure

Cartesian coordinates

Geometry of Furan in x, y and z coordinates (Å units) to copy/paste elsewhere. Generated with Open Babel software.

2D drawing


Furan YLQBMQCUIZJEEH-UHFFFAOYSA-N chemical compound 2D structure molecule svg


Molecule descriptors

IUPAC namefuran
InChI codeInChI=1S/C16H34/c1-3-5-7-9-11-13-15-16-14-12-10-8-6-4-2/h3-16H2,1-2H3

Other names (synonyms)

IUPAC nomenclature provides a standardized method for naming chemical compounds. Although this system is widely used in chemistry, many chemical compounds have also other names commonly used in different contexts. These synonyms can come from a variety of sources and are used for a variety of purposes.

One common source of synonyms for chemical compounds is the common or trivial names, assigned on the basis of appearance, properties, or origin of the molecule.

Another source of synonyms are historical or obsolete names employed in the past, however replaced nowadays by more modern or standardized names.

In addition to common and historical names, chemical compounds may also have synonyms that are specific to a particular field or industry.

Reference codes for other databases

There exist several different chemical codes commonly used in orded to identify molecules:

Physico-Chemical properties

IUPAC namefuran
Molecular formulaC4H4O
Molecular weight68.074
Melting point (ºC)-
Boiling point (ºC)32
Density (g/cm3)0.940
Molar refractivity18.71
Topological polar surface area-

LogP and topological polar surface area (TPSA) values were estimated using Open Babel software.

The n-octanol/water partition coeficient (Kow) data is applied in toxicology and drug research. Kow values are used, to guess the environmental fate of persistent organic pollutants. High partition coefficients values, tend to accumulate in the fatty tissue of organisms. Molecules with a log(Kow) (or LogP) greater than 5 are considered to bioaccumulate.

TPSA values are the sum of the surface area over all polar atoms or molecules, mainly oxygen and nitrogen, also including hydrogen atoms.

In medicinal chemistry, TPSA is used to assess the ability of a drug to permeabilise cells.

For molecules to penetrate the blood-brain barrier (and act on receptors in the central nervous system), TPSA values below 90 Å2 are required. Thus, molecules with a polar surface area greater than 140 Å2 tend to be poorly permeable to cell membranes.