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Aliphatic compound

File:Butane-2D-flat.png
Acyclic aliphatic compound or non-aromatic (Butane)
File:Cyclobutane2.svg
Cyclic aliphatic /non-aromatic compounds(Cyclobutane)

In organic chemistry, compounds composed of carbon and hydrogen are divided into two classes: aromatic compounds and aliphatic compounds (/ˌælɨˈfætɨk/; G. aleiphar, fat, oil) also known as non-aromatic compounds. Aromatic compounds contain an aromatic-ring configuration of atoms, such as benzene, whereas aliphatic compounds do not.[1] Aliphatic compounds can be saturated, like hexane, or unsaturated, like hexene.

Structure

Aliphatic compounds can be saturated, joined by single bonds (alkanes), or unsaturated, with double bonds (alkenes) or triple bonds (alkynes). Besides hydrogen, other elements can be bound to the carbon chain, the most common being oxygen, nitrogen, sulfur, and chlorine.

The simplest aliphatic compound is methane (CH4). Aliphatics include alkanes, alkenes, and alkynes. Fatty acids consist of an unbranched aliphatic tail attached to a carboxylic acid functional group.

Properties

Most aliphatic compounds are flammable, allowing the use of hydrocarbons as fuel, such as methane in Bunsen burners and as liquified natural gas (LNG), and acetylene in welding.

Examples of aliphatic compounds / non-aromatic

The most important aliphatic compounds are:

  • n-, iso- and cyclo-alkanes (saturated hydrocarbons)
  • n-, iso- and cyclo-alkenes and -alkynes (unsaturated hydrocarbons).

Important examples of low-molecular aliphatic compounds can be found in the list below (sorted by the number of carbon-atoms):

Formula Name CAS-Number Structural Formula Chemical Classification
CH4 Methane 74-82-8 75px Alkane
C2H2 Ethyne 74-86-2 75px Alkyne
C2H4 Ethene 74-85-1 75px Alkene
C2H6 Ethane 74-84-0 75px Alkane
C3H4 Propyne 74-99-7 75px Alkyne
C3H6 Propene - 100px Alkene
C3H8 Propane - 100px Alkane
C4H6 1,2-Butadiene 590-19-2 100px Diene
C4H6 1-Butyne - 100px Alkyne
C4H8 Butene - e.g. 100px Alkene
C4H10 Butane - 100px Alkane
C6H10 Cyclohexene 110-83-8 40px Cycloalkene
C5H12 n-pentane 109-66-0 75px Alkane
C7H14 Cycloheptane 291-64-5 50px Cycloalkane
C7H14 Methylcyclohexane 108-87-2 75px Cyclohexane
C8H8 Cubane 277-10-1 75px Cyclobutane
C9H20 Nonane 111-84-2 100px Alkane
C10H12 Dicyclopentadiene 77-73-6 125px Diene, Cycloalkene
C10H16 Phellandrene 99-83-2 50px50px Terpene, Diene Cycloalkene
C10H16 α-Terpinene 99-86-5 90px Terpene, Cycloalkene, Diene
C10H16 Limonene 5989-27-5 50px50px Terpene, Diene, Cycloalkene
C11H24 Undecane 1120-21-4 125px Alkane
C30H50 Squalene 111-02-4 125px Terpene, Polyene
C2nH4n Polyethylene 9002-88-4 75px Alkane

A few structures can be shown as example:

But-1-ene can be shown as

CH2=CH-CH2-CH3

Aliphatic acids

Aliphatic acids are the acids of nonaromatic hydrocarbons, such as acetic, propionic, and butyric acids.

See also

References

  1. ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version:  (1995) "Aliphatic compounds".

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