That part of the name of a compound (often a letter or number) that describes the position of an atom, residue or functional group e.g. the 2 in hexan-2-one

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  • Locant — A locant can be used in organic chemistry to indicate the position of a functional group within a molecule [See [http://cancerweb.ncl.ac.uk/cgi bin/omd?query=locant action=Search+OMD the definition at CancerWEB s online medical dictionary] . ] .… …   Wikipedia

  • locant — A number or letter preceding a substituent name in the name of a complex chemical that specifies the position (location) of the substituent on the parent molecule; e.g., 5 in 5 methyluridine, S in S adenosylmethionine …   Medical dictionary

  • locant — lo·cant …   English syllables

  • locant — ˈlōkənt noun ( s) Etymology: location + ant : the portion of a chemical name that designates the position of an atom or group in a molecule (as β in β naphthylamine, m in m xylene, 2 in 2 butanol, or 1 in glucose 1 C14) …   Useful english dictionary

  • hydrocarbon — hydrocarbonaceous, adj. /huy dreuh kahr beuhn, huy dreuh kahr /, n. any of a class of compounds containing only hydrogen and carbon, as an alkane, methane, CH4, an alkene, ethylene, C2H4, an alkyne, acetylene, C2H2, or an aromatic compound,… …   Universalium

  • IUPAC nomenclature of organic chemistry — The IUPAC nomenclature of organic chemistry is a systematic method of naming organic chemical compounds as recommended[1] by the International Union of Pure and Applied Chemistry (IUPAC). Ideally, every possible organic compound should have a… …   Wikipedia

  • nor- — 1. Chemical prefix denoting 1) elimination of one methylene group from a chain, the highest permissible locant being used; 2) contraction of a (steroid) ring by one CH2 unit, the locant being the capital letter identifying the …   Medical dictionary

  • Delta (letter) — Greek alphabet Αα Alpha Νν Nu Ββ Beta …   Wikipedia

  • M-Xylene — Chembox new Name = m Xylene ImageFile = m Xylene.png ImageName = m Xylene ImageSize = 100px ImageFile1 = m xylene spaceFilling.png ImageSize1 = 150px ImageName1 = m xylene 3D diagram OtherNames = m Xylol 1,3 Dimethylbenzene Section1 = Chembox… …   Wikipedia

  • Nor- — In chemical nomenclature, nor is a prefix to name a structural analog that can be derived from a parent compound by the removal of one carbon atom along with the accompanying hydrogen. The nor compound can be derived by demethylation or by… …   Wikipedia

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