In chemical nomenclature, the IUPAC nomenclature of organic chemistry is a systematic method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC). It is published in the Nomenclature of Organic Chemistry (informally called the Blue Book). Ideally, every possible organic compound should have a name from which an unambiguous structural formula can be created. There is also an IUPAC nomenclature of inorganic chemistry. To avoid long and tedious names in normal communication, the official IUPAC naming recommendations are not always followed in practice, except when it is necessary to give an unambiguous and absolute definition to a compound. IUPAC names can sometimes be simpler than older names, as with ethanol, instead of ethyl alcohol. For relatively simple molecules they can be more easily understood than non-systematic names, which must be learnt or looked up. However, the common or trivial name is often substantially shorter and clearer, and so preferred. These non-systematic names are often derived from an original source of the compound (see § Common nomenclature – trivial names below). In addition, very long names may be less clear than structural formulae.
1 Basic principles
5 Order of precedence of groups 6 Common nomenclature – trivial names
6.1 Ketones 6.2 Aldehydes
8 See also 9 References
9.1 Citations 9.2 Sources
10 External links
This article needs to be updated. Please update this article to reflect recent events or newly available information. (November 2017)
In chemistry, a number of prefixes, suffixes and infixes are used to describe the type and position of functional groups in the compound. The steps for naming an organic compound are:
Identification of the parent hydrocarbon chain. This chain must obey the following rules, in order of precedence:
It should have the maximum number of substituents of the suffix functional group. By suffix, it is meant that the parent functional group should have a suffix, unlike halogen substituents. If more than one functional group is present, the one with highest precedence should be used. It should have the maximum number of multiple bonds It should have the maximum number of single bonds. It should have the maximum length.
Identification of the parent functional group, if any, with the highest order of precedence. Identification of the side-chains. Side chains are the carbon chains that are not in the parent chain, but are branched off from it. Identification of the remaining functional groups, if any, and naming them by their ionic prefixes (such as hydroxy for -OH, oxy for =O, oxyalkane for O-R, etc.). Different side-chains and functional groups will be grouped together in alphabetical order. (The prefixes di-, tri-, etc. are not taken into consideration for grouping alphabetically. For example, ethyl comes before dihydroxy or dimethyl, as the "e" in "ethyl" precedes the "h" in "dihydroxy" and the "m" in "dimethyl" alphabetically. The "di" is not considered in either case). When both side chains and secondary functional groups are present, they should be written mixed together in one group rather than in two separate groups. Identification of double/triple bonds. Numbering of the chain. This is done by first numbering the chain in both directions (left to right and right to left), and then choosing the numbering which follows these rules, in order of precedence
Has the lowest-numbered locant (or locants) for the suffix functional group. Locants are the numbers on the carbons to which the substituent is directly attached. Has the lowest-numbered locants for multiple bonds (The locant of a multiple bond is the number of the adjacent carbon with a lower number). Has the lowest-numbered locants for prefixes.
Numbering of the various substituents and bonds with their locants. If there is more than one of the same type of substituent/double bond, a prefix is added showing how many there are ( di – 2 tri – 3 tetra – 4 then as for the number of carbons below with 'a' added)
The numbers for that type of side chain will be grouped in ascending order and written before the name of the side-chain. If there are two side-chains with the same alpha carbon, the number will be written twice. Example: 2,2,3-trimethyl- . If there are both double bonds and triple bonds, "en" (double bond) is written before "yne" (triple bond). When the main functional group is a terminal functional group (a group which can exist only at the end of a chain, like formyl and carboxyl groups), there is no need to number it.
Arrangement in this form: Group of side chains and secondary functional groups with numbers made in step 3 + prefix of parent hydrocarbon chain (eth, meth) + double/triple bonds with numbers (or "ane") + primary functional group suffix with numbers. Wherever it says "with numbers", it is understood that between the word and the numbers, the prefix(di-, tri-) is used. Adding of punctuation:
Commas are put between numbers (2 5 5 becomes 2,5,5) Hyphens are put between a number and a letter (2 5 5 trimethylheptane becomes 2,5,5-trimethylheptane) Successive words are merged into one word (trimethyl heptane becomes trimethylheptane) Note: IUPAC uses one-word names throughout. This is why all parts are connected.
The finalized name should look like this: #,#-di<side chain>-#-<secondary functional group>-#-<side chain>-#,#,#-tri<secondary functional group><parent chain prefix><If all bonds are single bonds, use "ane">-#,#-di<double bonds>-#-<triple bonds>-#-<primary functional group> Note: # is used for a number. The group secondary functional groups and side chains may not look the same as shown here, as the side chains and secondary functional groups are arranged alphabetically. The di- and tri- have been used just to show their usage. (di- after #,#, tri- after #,#,#, etc.)
Here is a sample molecule with the parent carbons numbered:
For simplicity, here is an image of the same molecule, where the hydrogens in the parent chain are removed and the carbons are shown by their numbers:
Now, following the above steps:
The parent hydrocarbon chain has 23 carbons. It is called tricosa-. The functional groups with the highest precedence are the two ketone groups.
The groups are on carbon atoms 3 and 9. As there are two, we write 3,9-dione. The numbering of the molecule is based on the ketone groups. When numbering from left to right, the ketone groups are numbered 3 and 9. When numbering from right to left, the ketone groups are numbered 15 and 21. 3 is less than 15, therefore the ketones are numbered 3 and 9. The smaller number is always used, not the sum of the constituents numbers.
The side chains are: an ethyl- at carbon 4, an ethyl- at carbon 8, and a butyl- at carbon 12. Note:The -O-CH3 at carbon atom 15 is not a side chain, but it is a methoxy functional group.
There are two ethyl- groups. They are combined to create, 4,8-diethyl. The side chains are grouped like this: 12-butyl-4,8-diethyl. (But this is not necessarily the final grouping, as functional groups may be added in between to ensure all groups are listed alphabetically.)
The secondary functional groups are: a hydroxy- at carbon 5, a chloro- at carbon 11, a methoxy- at carbon 15, and a bromo- at carbon 18. Grouped with the side chains, this gives 18-bromo-12-butyl-11-chloro-4,8-diethyl-5-hydroxy-15-methoxy There are two double bonds: one between carbons 6 and 7, and one between carbons 13 and 14. They would be called "6,13-diene", but the presence of alkynes switches it to 6,13-dien. There is one triple bond between carbon atoms 19 and 20. It will be called 19-yne The arrangement (with punctuation) is: 18-bromo-12-butyl-11-chloro-4,8-diethyl-5-hydroxy-15-methoxytricosa-6,13-dien-19-yne-3,9-dione Finally, due to Cis-trans isomerism, we have to specify the relative orientation of functional groups around each double bond. For this example, we have (6E,13E)
The final name is
Main article: Alkane
Number of carbons 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 20 30 40 50 60 70 80 90 100
Prefix Meth Eth Prop But Pent Hex Hept Oct Non Dec Undec Dodec Tridec Tetradec Pentadec Hexadec Eicos Triacont Tetracont Pentacont Hexacont Heptacont Octacont Nonacont Hect
For example, the simplest alkane is CH4 methane, and the nine-carbon alkane CH3(CH2)7CH3 is named nonane. The names of the first four alkanes were derived from methanol, ether, propionic acid and butyric acid, respectively. The rest are named with a Greek numeric prefix, with the exceptions of nonane which has a Latin prefix, and undecane and tridecane which have mixed-language prefixes. Cyclic alkanes are simply prefixed with "cyclo-": for example, C4H8 is cyclobutane (not to be confused with butene) and C6H12 is cyclohexane (not to be confused with hexene).
Branched alkanes are named as a straight-chain alkane with attached alkyl groups. They are prefixed with a number indicating the carbon the group is attached to, counting from the end of the alkane chain. For example, (CH3)2CHCH3, commonly known as isobutane, is treated as a propane chain with a methyl group bonded to the middle (2) carbon, and given the systematic name 2-methylpropane. However, although the name 2-methylpropane could be used, it is easier and more logical to call it simply methylpropane – the methyl group could not possibly occur on any of the other carbon atoms (that would lengthen the chain and result in butane, not propane) and therefore the use of the number "2" is unnecessary. If there is ambiguity in the position of the substituent, depending on which end of the alkane chain is counted as "1", then numbering is chosen so that the smaller number is used. For example, (CH3)2CHCH2CH3 (isopentane) is named 2-methylbutane, not 3-methylbutane.
If there are multiple side-branches of the same size alkyl group, their positions are separated by commas and the group prefixed with di-, tri-, tetra-, etc., depending on the number of branches. For example, C(CH3)4 (neopentane) is named 2,2-dimethylpropane. If there are different groups, they are added in alphabetical order, separated by commas or hyphens: . The longest possible main alkane chain is used; therefore 3-ethyl-4-methylhexane instead of 2,3-diethylpentane, even though these describe equivalent structures. The di-, tri- etc. prefixes are ignored for the purpose of alphabetical ordering of side chains (e.g. 3-ethyl-2,4-dimethylpentane, not 2,4-dimethyl-3-ethylpentane).
If higher precedence functional groups are present (see order of precedence, below), the prefix "hydroxy" is used with the bonding position: CH3CHOHCOOH is 2-hydroxypropanoic acid.
Ketones Main article: Ketones
In general ketones (R-CO-R) take the suffix "-one" (pronounced own, not won) with an infix position number: CH3CH2CH2COCH3 is pentan-2-one. If a higher precedence suffix is in use, the prefix "oxo-" is used: CH3CH2CH2COCH2CHO is 3-oxohexanal.
Aldehydes Main article: Aldehydes
Carboxylic acids Main article: Carboxylic acids
In general carboxylic acids are named with the suffix -oic acid
(etymologically a back-formation from benzoic acid). Similar to
aldehydes, they take the "1" position on the parent chain, but do not
have their position number indicated. For example, CH3CH2CH2CH2COOH
(valeric acid) is named pentanoic acid. For common carboxylic acids
some traditional names such as acetic acid are in such widespread use
they are considered retained IUPAC names, although "systematic" names
such as ethanoic acid are also acceptable. For carboxylic acids
attached to a benzene ring such as Ph-COOH, these are named as benzoic
acid or its derivatives.
If there are multiple carboxyl groups on the same parent chain, the
suffix "-carboxylic acid" can be used (as -dicarboxylic acid,
-tricarboxylic acid, etc.). In these cases, the carbon in the carboxyl
group does not count as being part of the main alkane chain. The same
is true for the prefix form, "carboxyl-".
Ethers Main article: Ethers
Esters Main article: Esters
If the alkyl group is not attached at the end of the chain, the bond position to the ester group is infixed before "-yl": CH3CH2CH(CH3)OOCCH2CH3 may be called but-2-yl propanoate or but-2-yl propionate.
Amines and amides
Amines (R-NH2) are named for the attached alkane chain with the suffix "-amine" (e.g. CH3NH2 methanamine). If necessary, the bonding position is infixed: CH3CH2CH2NH2 propan-1-amine, CH3CHNH2CH3 propan-2-amine. The prefix form is "amino-". For secondary amines (of the form R-NH-R), the longest carbon chain attached to the nitrogen atom becomes the primary name of the amine; the other chain is prefixed as an alkyl group with location prefix given as an italic N: CH3NHCH2CH3 is N-methylethanamine. Tertiary amines (R-NR-R) are treated similarly: CH3CH2N(CH3)CH2CH2CH3 is N-ethyl-N-methylpropanamine. Again, the substituent groups are ordered alphabetically.
Amides (R-CO-NH2) take the suffix "-amide", or "-carboxamide" if the carbon in the amide group cannot be included in the main chain. The prefix form is both "carbamoyl-" and "amido-". Amides that have additional substituents on the nitrogen are treated similarly to the case of amines: they are ordered alphabetically with the location prefix N: HCON(CH3)2 is N,N-dimethylmethanamide.
Cycloalkanes and aromatic compounds can be treated as the main parent chain of the compound, in which case the positions of substituents are numbered around the ring structure. For example, the three isomers of xylene CH3C6H4CH3, commonly the ortho-, meta-, and para- forms, are 1,2-dimethylbenzene, 1,3-dimethylbenzene, and 1,4-dimethylbenzene. The cyclic structures can also be treated as functional groups themselves, in which case they take the prefix "cycloalkyl-" (e.g. "cyclohexyl-") or for benzene, "phenyl-". The IUPAC nomenclature scheme becomes rapidly more elaborate for more complex cyclic structures, with notation for compounds containing conjoined rings, and many common names such as phenol being accepted as base names for compounds derived from them.
Spiro compounds Main article: Spiro compound Bicyclic compounds Main article: Bicyclic molecule Polycyclic compounds Main article: Polycyclic compound Order of precedence of groups When compounds contain more than one functional group, the order of precedence determines which groups are named with prefix or suffix forms. The highest-precedence group takes the suffix, with all others taking the prefix form. However, double and triple bonds only take suffix form (-en and -yn) and are used with other suffixes. Prefixed substituents are ordered alphabetically (excluding any modifiers such as di-, tri-, etc.), e.g. chlorofluoromethane, not fluorochloromethane. If there are multiple functional groups of the same type, either prefixed or suffixed, the position numbers are ordered numerically (thus ethane-1,2-diol, not ethane-2,1-diol.) The N position indicator for amines and amides comes before "1", e.g. CH3CH(CH3)CH2NH(CH3) is N,2-dimethylpropanamine.
Priority Functional group Formula Prefix Suffix
1 Cations e.g. Ammonium NH4+ -onio- ammonio- -onium -ammonium
2 Carboxylic acids
Carbothioic S-acids Carboselenoic Se-acids Sulfonic acids Sulfinic acids
–COOH –COSH –COSeH –SO3H –SO2H carboxy- sulfanylcarbonyl- selanylcarbonyl- sulfo- sulfino- -oic acid* -thioic S-acid* -selenoic Se-acid* -sulfonic acid -sulfinic acid
Esters Acyl halides Amides Imides Amidines
–COOR –COX –CONH2 –CON=C< –C(=NH)NH2 R-oxycarbonyl- halocarbonyl- carbamoyl- -imido- amidino- -R-oate -oyl halide* -amide* -imide* -amidine*
4 Nitriles Isocyanides –CN –NC cyano- isocyano- -nitrile* isocyanide
5 Aldehydes Thioaldehydes –CHO –CHS formyl- thioformyl- -al* -thial*
Thioketones Selones Tellones
=O =S =Se =Te oxo- sulfanylidene- selanylidene- tellanylidene- -one -thione -selone -tellone
Thiols Selenols Tellurols
–OH –SH –SeH –TeH hydroxy- sulfanyl- selanyl- tellanyl- -ol -thiol -selenol -tellurol
Peroxols Thioperoxols (Sulfenic acid) Dithioperoxols
-OOH -SOH -SSH
hydroperoxy- hydroxysulfanyl- disulfanyl-
-peroxol -SO-thioperoxol -dithioperoxol
9 Amines Imines Hydrazines –NH2 =NH –NHNH2 amino- imino- hydrazino- -amine -imine -hydrazine
*Note: These suffixes, in which the carbon atom is counted as part of the preceding chain, are the most commonly used. See individual functional group articles for more details. The order of remaining functional groups is only needed for substituted benzene and hence is not mentioned here.[clarification needed] Common nomenclature – trivial names Common nomenclature uses the older names for some organic compounds instead of using the prefixes for the carbon skeleton above. The pattern can be seen below.
Number of carbons Prefix as in new system Common name for alcohol Common name for aldehyde Common name for acid
1 Meth- Methyl alcohol (wood alcohol) Formaldehyde Formic acid
2 Eth- Ethyl alcohol (grain alcohol) Acetaldehyde Acetic acid
3 Prop- Propyl alcohol Propionaldehyde Propionic acid
4 But- Butyl alcohol Butyraldehyde Butyric acid
5 Pent- Amyl alcohol Valeraldehyde Valeric acid
6 Hex- Caproyl alcohol Caproaldehyde Caproic acid
7 Hept- Enanthyl alcohol Enanthaldehyde Enanthoic acid
8 Oct- Capryl alcohol Caprylaldehyde Caprylic acid
9 Non- Pelargonic alcohol Pelargonaldehyde Pelargonic acid
10 Dec- Capric alcohol Capraldehyde Capric acid
11 Undec- - - -
12 Dodec- Lauryl alcohol Lauraldehyde Lauric acid
13 Tridec- - - -
14 Tetradec- Myristyl alcohol Myristaldehyde Myristic acid
15 Pentadec- - - -
16 Hexadec- Cetyl alcohol Palmityl alcohol Palmitaldehyde Palmitic acid
17 Heptadec- - - Margaric acid
18 Octadec- Stearyl alcohol Stearaldehyde Stearic acid
20 Eicos- Arachidyl alcohol - Arachidic acid
22 Docos- Behenyl alcohol - Behenic acid
24 Tetracos- Lignoceryl alcohol - Lignoceric acid
26 Hexacos- Ceryl alcohol - Cerotic acid
28 Octacos- Montanyl alcohol - Montanic acid
30 Triacont- Melissyl alcohol - Melissic acid
32 Dotriacont- Lacceryl alcohol - Lacceroic acid
33 Tritriacont- Psyllic alcohol - Psyllic acid
34 Tetratriacont- Geddyl alcohol - Geddic acid
35 Pentatriacont- - - Ceroplastic acid
40 Tetracont- - - -
Ketones Common names for ketones can be derived by naming the two alkyl or aryl groups bonded to the carbonyl group as separate words followed by the word ketone.
Acetone Acetophenone Benzophenone Ethyl isopropyl ketone Diethyl ketone
The first three of the names shown above are still considered to be acceptable IUPAC names. Aldehydes The common name for an aldehyde is derived from the common name of the corresponding carboxylic acid by dropping the word acid and changing the suffix from -ic or -oic to -aldehyde.
The IUPAC nomenclature also provides rules for naming ions.
Hydron is a generic term for hydrogen cation; protons, deuterons and
tritons are all hydrons. The Hydrons are not found in heavier
Preferred IUPAC name Von Baeyer nomenclature Hantzsch–Widman nomenclature Phanes Nucleic acid notation International Union of Biochemistry and Molecular Biology Organic nomenclature in Chinese
^ The Commission on the Nomenclature of Organic Chemistry (1971) [1958 (A: Hydrocarbons, and B: Fundamental Heterocyclic Systems), 1965 (C: Characteristic Groups)]. Nomenclature of Organic Chemistry (3rd edition combined ed.). London: Butterworths. ISBN 0-408-70144-7. ^ "Basic IUPAC Organic Nomenclature".
Favre, Henri A.; Powell, Warren H. (2013). Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013. Royal Society of Chemistry. ISBN 978-0-85404-182-4.
IUPAC Nomenclature of Organic Chemistry (online version of the "Blue Book") IUPAC Recommendations on Organic & Biochemical Nomenclature, Symbols, Terminology, etc. (includes IUBMB Recommendations for biochemistry) Bibliography of IUPAC Recommendations on Organic Nomenclature (last updated 11 April 2003) ACD/Name Software for generating systematic nomenclature ChemAxon Name <> Structure – ChemAxon IUPAC (& traditional) name to structure and structure to IUPAC name software. As used at chemicalize.org chemicalize.org A free web site/service that extracts IUPAC names from web pages and annotates a 'chemicalized' version with structure images. Structures from annotated pages can also be searched. G. A. Eller, Improving the Quality of Published Chemical Names with Nomenclature Software. Molecules 2006, 9, pp. 915–928 (online article) American Chemical Society, Committee on Nomenclature, Terminology & Symbols Principles of Chemical Nomenclature. A GUIDE TO IUPAC RECOMMENDATIONS; Leigh, Favre & Metanomski; IUPAC, 1998.
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