Locant | chemical nomenclature | Britannica (original) (raw)

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hydrocarbons

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  In hydrocarbon: Nomenclature
  …a number (3-), called a locant, obtained by successively numbering the carbons in the parent chain starting at the end nearer the branch. The compound is therefore called 3-methylheptane.
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steroids

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  In steroid: Steroid numbering system and nomenclature
  …and suffixes include numbers, called locants, indicative of the position in the carbon skeleton at which the modification occurs, and, where necessary, the orientation of a substituent is shown as α- or β-. The carbon atom at position 3, for example, is referred to as C3; a hydroxyl group attached…
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