diastereoisomer

diastereoisomer

also spelled  diasteromer 

      either member of a pair of substances that differ with respect to the configurations of their molecules (i.e., stereoisomers) and that lack a mirror-image relationship (i.e., are not enantiomorphs). An example is the pair consisting of either of the two optically active forms of tartaric acid (either the dextrorotatory or levorotatory form) and the optically inactive meso form of the same acid (mesotartaric acid). Unlike enantiomorphs, diastereoisomers need not have closely similar physical and chemical properties: they may differ as greatly as do structural isomers. For example, either of the optically active tartaric acids melts at 187° C (369° F), whereas mesotartaric acid melts at 143° C (290° F).

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Look at other dictionaries:

  • diastereoisomer — noun A stereoisomer having multiple chiral centres; a diastereoisomer can not normally be superimposed on the mirror image of another …   Wiktionary

  • diastereoisomer — noun see diastereomer …   New Collegiate Dictionary

  • Diastereoisomer — Di|a|ste|re|o|i|so|mer ↑ Diastereoisomerie …   Universal-Lexikon

  • diastereoisomer — dia·ster·eo·iso·mer (di″ə ster″e o iґso mər) diastereomer …   Medical dictionary

  • diastereoisomer — [ˌdʌɪəstɛrɪəʊ ʌɪsəmə] noun Chemistry each of a pair of stereoisomeric compounds that are not mirror images of one another. Derivatives diastereoisomeric adjective …   English new terms dictionary

  • diastereoisomer — dia·stereoisomer …   English syllables

  • diastereoisomer — …   Useful english dictionary

  • deracemization — noun The conversion of a racemate into a pure enantiomer or into a mixture in which one enantiomer is present in excess, or of a diastereoisomeric mixture into a single diastereoisomer or into a mixture in which one diastereoisomer predominates …   Wiktionary

  • diastereomer — noun see diastereoisomer * * * /duy euh ster ee euh meuhr, stear /, n. Chem. either of a pair of stereoisomers that are not mirror images of each other. Also called diastereoisomer /duy euh ster ee oh uy seuh meuhr, stear /. Cf. enantiomer. [1935 …   Useful english dictionary

  • diastereomer — or diastereoisomer noun Date: 1936 a stereoisomer of a compound having two or more chiral centers that is not a mirror image of another stereoisomer of the same compound compare enantiomer • diastereomeric or diastereoisomeric adjective •… …   New Collegiate Dictionary

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