substitutive nomenclature

chemistry

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July 14, 2026

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Substitutive nomenclature in chemistry is a system for naming compounds, particularly organohalogen compounds. In this method, prefixes like "fluoro-", "chloro-", "bromo-", or "iodo-" are added to the name of the hydrocarbon framework. A number, known as a locant, is used to indicate the specific carbon atom to which the halogen is attached. When multiple substituents are present, including halogens, they are listed in alphabetical order. This systematic approach ensures clarity and consistency in chemical naming, distinguishing it from older common or trivial names.123

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organohalogen compound
Nomenclature
…used when naming organohalogen compounds: substitutive and functional class. In substitutive nomenclature the prefix fluoro-, chloro-, bromo-, or iodo- is added to the name of the hydrocarbon framework along with a number (called a locant) identifying the carbon to which the halogen is attached. Substituents, including the halogen, are listed…
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…used when naming organohalogen compounds: substitutive and functional class. In substitutive nomenclature the prefix fluoro-, chloro-, bromo-, or iodo- is added to the name of the hydrocarbon framework along with a number (called a locant) identifying the carbon to which the halogen is attached. Substituents, including the halogen, are listed…
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