Medical dictionary. 2011.
isomerism — /uy som euh riz euhm/, n. 1. Chem. the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism), as CH3OCH3 and… … Universalium
isomerism — The existence of a chemical compound in two or more forms that are identical with respect to percentage composition but differ as to the positions of one or more atoms within the molecules, as well as in physical and chemical properties.… … Medical dictionary
chain isomerism — a type of constitutional isomerism in which the compounds differ in regard to the linkages in the basic chain of carbon atoms; see illustration. Chain isomerism … Medical dictionary
functional group isomerism — a type of constitutional isomerism dependent upon the presence of different functional groups, such compounds being of distinct chemical types, e.g., ethyl alcohol, C2H5OH, and dimethyl ether, CH3OCH3 … Medical dictionary
position isomerism — a type of constitutional isomerism in which the position occupied by an atom or group differs with reference to the same fundamental carbon chain; for example, n propyl chloride, CH3CH2CH2Cl, and isopropyl chloride, CH3CHClCH3 … Medical dictionary
structural isomerism — constitutional i … Medical dictionary
Structural isomer — Structural isomerism, or constitutional isomerism (per IUPAC), is a form of isomerism in which molecules with the same molecular formula have bonded together in different orders, as opposed to stereoisomerism.[1] There are multiple synonyms for… … Wikipedia
stereoisomerism — Molecular asymmetry, isomerism involving different spatial arrangements of the same groups ( e.g., androsterone and isoandrosterone, differing only in that one has a 3α OH, the other a 3β OH). SEE ALSO: stereoisomer, Le Bel van t Hoff rule. SYN:… … Medical dictionary
Isomer — This article is about the chemical concept. For isomerism of atomic nuclei, see nuclear isomer. In chemistry, isomers (from Greek ἰσομερής, isomerès; isos = equal , méros = part ) are compounds with the same molecular formula but different… … Wikipedia
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
