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: stereochemical isomerism.

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ster·eo·isom·er·ism (ster″e-o-i-somґər-iz-əm) [stereo- + isomerism] the relationship between two or more isomers that have the same structure (the same linkages between atoms) but different configurations (spatial arrangements) in contrast to constitutional isomerism in which the isomers have different structures. Stereoisomers are further classified into enantiomers, those having molecules that are mirror images of each other, and diastereomers, those that do not. An older classification used the subdivisions optical and geometric isomerism (q.v.), which did not include all forms of stereoisomerism. Called also configurational, stereochemical, or spatial isomerism. stereoisomeric adj

Stereoisomerism, exemplified by a pair of cis-trans diastereomers.


Medical dictionary. 2011.

Look at other dictionaries:

  • Stereoisomerism — The different types of isomers. Stereochemistry focuses on stereoisomers Stereoisomers are isomeric molecules that have the same molecular formula and sequence of bonded atoms (constitution), but that differ only in the three dimensional… …   Wikipedia

  • stereoisomerism — erdvinė izomerija statusas T sritis chemija apibrėžtis Erdvinių izomerų egzistavimas. atitikmenys: angl. stereoisomerism rus. пространственная изомерия; стереоизомерия ryšiai: sinonimas – stereoizomerija …   Chemijos terminų aiškinamasis žodynas

  • stereoisomerism — erdvinė izomerija statusas T sritis fizika atitikmenys: angl. space isomerism; stereoisomerism vok. Raumisomerie, f; Stereoisomerie, f rus. пространственная изомерия, f; стереоизмерия, f pranc. stéréo isomérie, f …   Fizikos terminų žodynas

  • stereoisomerism — noun see stereoisomer …   New Collegiate Dictionary

  • stereoisomerism — /ster ee oh uy som euh riz euhm, stear /, n. Chem. the isomerism ascribed to different relative positions of the atoms or groups of atoms in the molecules of organic compounds. [1890 95; STEREO + ISOMERISM] * * * …   Universalium

  • stereoisomerism — noun a form of isomerism in which atoms are arranged differently about a chiral centre (or centre of asymmetry); they exhibit optical activity; in a molecule with a single chiral centre the two isomers (enantiomers) are mirror images of each… …   Wiktionary

  • stereoisomerism — n. condition in which two or more isomers have identical molecular structures but with differing atomic arrangements (Chemistry) …   English contemporary dictionary

  • stereoisomerism — stereo·isomerism …   English syllables

  • stereoisomerism — ster•e•o•i•som•er•ism [[t]ˌstɛr i oʊ aɪˈsɒm əˌrɪz əm, ˌstɪər [/t]] n. chem. the isomerism ascribed to different relative positions of the atoms or groups of atoms in the molecules of organic compounds • Etymology: 1890–95 …   From formal English to slang

  • stereoisomerism — “+ noun Etymology: stere + isomerism : isomerism in which atoms are linked in the same order but differ in their arrangement in space sometimes distinguished from structural isomerism; see geometric isomerism, optical isomerism * * * /ster ee oh… …   Useful english dictionary

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